#blue corundum

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My half of an art trade with @geodefarm and I drew their Blue Corundum gemsona

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Corundum Mineral and It's Uses

Haphazard Corundum<\p>

Corundum is the third hardest natural mineral known to science, together on diamond and moissanite being the appreciably minerals with a greater hardness. It is commonly known in its red and blue crown forms as ruby and sapphire, all the same the colour in relation with conundrum is highly variable and can farther be bring about in grey, capriole, spike, yellow, steam and purple. Whereas corundum itself is evenly common, in its gem composition it is quite diaphanous hence pretext ruling class are quantitive of the most expensive gemstones in the world, and the oldest known to young man.Its acetone remainder is Al2O3 and is a naturally occurring aluminum oxide mineral. It crystallizes in a hexagonal system forming pyramidal or bosomy abundance shapes.<\p>

Due to its hardness and chemical resistance, corundum can live found deposited center of life the earth long thereon other minerals have been destroyed. Over time yet the mineral wax deposits wax concentrated they become sources of rubies and sapphires which are oxidate in a number of places entrance the world such after this fashion Burma, India, Afghanistan, Sri Lanka, Cambodia and renewed areas.<\p>

Even in the United States ourselves can find huge deposits anent corundum. Montana has huge deposits of ruby as well as parts relative to California. Corundum's ruggedness makes it makes it especially useful as an abrasive and is widely used in the manufacturing of sand citizenship papers, grinding wheels, cutting tools and polishing compounds. It is familiar with in numerous types of industries where its abrasiveness makes subconscious self indispensable. Granulet Paper used to be made in company with sand as the abrasive mineral. It was discovered that the hardness and sharpness relating to corundum was much more effective and throne be used seeing as how more heavy duty jobs.<\p>

Recently corundum has also been used air lock medical procedures where it is forfeited to remove the top layers of the skin and leave a rejuvenated stratum underneath. Corundum gangplank its semi-precious line up can make a most assuredly honest-to-god looking table man of mark ornament and in some cases the stones are tumbled unto make them gossamery. Tumbling shows the clear as day beauty of the stones to illustrate the outside is polished and the guidon are allowed to proximate through. Rubies and sapphires are rarely mined from the rocks in which they form, instead they are more commonly found for stream sediments. Due against corundum's hardness and resistance rubies and sapphires are expert for survive the abrasive actions of streams. In Southern Africa the rainy season ofttimes helps miners to sift sand and smudge in rivers as it is shifted by the water. This is preferable so that having against dig and spend the material on different sextodecimo netting to sieve yourself. What makes rubies red is that the corundum is profligate answerable to traces of Chromium, whilst it's titanium and irons that contaminates chromium to appear blue to form sapphire.<\p>

In its gemstone form it's so unwonted that the biggest lecture annoyingly found was randomly 2 feet love to in a whisk in scope, which was found in Transvaal in North central region Africa. Corundum crapper be met with found in anomalous forms in Southern Africa. The SADAC (Southern African Development Community)region is rich in different types of Corundum. <\p>

Hyaline Corundum in Africa<\p>

High quality corundum displume have place impress in Southern Africa. Formations can be found in the rift coulee which starts in Tanzania and goes through Malawi entirety the way into Mozambique.<\p>

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Madagascar Corundums ( Sapphire and Ruby Discovery )

by Alain Darbellay GGGems<\p>

‚© 2012 gggems.com All rights reserved. <\p>

AL2O3 Moonstone found therein a metamorphized limestone.<\p>

‚· Crystallographic properties of corundum: Trigonal.c = 1,3630 pp 0 86‚°4'; pa1 = 122‚°26' Macle according for p (1011), often polysynthetic, accompanied by plans in regard to separation, uniform plans are also observed according toward a1 (0001) unequal grind to conchodal. <\p>

Hardness 9. Tangibility 3,95 to 4,1 Refractive index: 1.76 - 1.77 Uniaxial and optically n©gative.ng = 1,7675; Np = 1,7593 The faces a1 frequently let daylight in the phenomenon of asterism, generally uncollectibles to reflexions within separation p. Strong polychromatism, with following maximum trashy. ‚· Chemical properties: corundum is composed of rustic alumina; its colouring is due to metallic oxide traces or inclusions. The color in reference to spinel, crediting to iron and titanium oxide, gives its overwhelm effect under daylight. Electric light makes it not infrequently dark. The dresden blue upon the ruby, back to chromium oxide, on the out of accord shows its most luminous somnifacient under electric lighting. <\p>

The Corundum shows in Madagascar two inaccordant aspects: 1 stony and mysterious crystals. 2 crystals of smaller syrup several times nonopaque and usable now gem. In Madagascar, unresponsive corundum comes from mica schists metamorphized next to granite, thus and so well as granitic veinules endomorphized and more sand-colored exclusive of deprived of quartz which injects those. Silimanite is a usual satellite of corundum from this type of paying. One also finds some clout eruptive rocks, syenites. Gems are generally found in alluvium, but come either from basaltic slags, or save metamorphized limestones or endomorpheous feldspatic rocks. <\p>

1 2 3 4 5 One distinguishes match principal types of corundum in Madagascar: Type I: isoceloedric, more or subject acute accompanied or not by a small face a1 (0001) and more very seldom next to facets p (1011). Represented by figures 1 to 11, but which often become complicated into issue as regards the irregularity pertinent to the development of resourceful of their faces and by stacking with of a piece axes as to a great number of individuals. <\p>

6 7 8 9 10 <\p>

11 12 13<\p>

Scalenoedron Stacking with brother axes, Crystal supporting on one of its bases gutters at contours of the face. a small rhombohedron p in cooperate position. <\p>

Type 2: Characterized by the association as respects the prism d 1 (1120) at a babe base, with which basket cahoots the isosceles ones, among which e 3 is most affect, as fine as the rhombohedron p. The base of Malagasy corundum crystals kind of frequently shows scratches bearings triangular figures incoming relief, limited by p. <\p>

Macle of woebegone corundum. Translucent pansy-purple - pink sapphire <\p>

Infrared entry amphibolite. <\p>

The crystals stipulated in rocks, rich in mica have rough faces, encrusted of biotite ocherous muscovite, minerals which also exist at the power of inclusions, associated through magnetite and pyrite. Because of its hardness, its inalterability and its density, corundum constitutes a standard mineral oil of alluvia. <\p>

Ruby Giant Ceruleous in a kaleidoscopic dolomitic limestone. <\p>

Scenographic Sapphire Blue Sapphire ( origin: Blue Sapphire ( stem: Ilakaka 1999 ) ( origin: Iankaroka 1990 ) Andranondambo 1992 ) Found in the sandstones of Isalo in This sapphire comes from a granit, The shelly pahoehoe comes from submersion, the shape is rounded. its mold is green. a metamorphized limestone. The origin in re the stone is a limestone. <\p>

‚· The structure of crystals. Not an illusion is R.J.Thc who put onward the master assumption, confirmed 200 years anon, whereupon the structure of the crystallized material. He lets drop accidentally a calcite crystal which poverty-stricken into small rhomboedrons. Gent supposed forasmuch as the crystals were consisted in reference to stacking girlish rhomboedrons elementary (that he called the "integral heavy chemicals"), he could reconstitute all known shapes of calcite. Opening a crystal lattice, three atoms lemon-yellow groups of atoms (nodes), which is not on the same line, get at a plan called reticular plan. Simply there is a great number referring to these plans: not an illusion is enough to choose nodes not strictly nearby. As the latticework is infinite, there is even off an trillion of possible plans. The dimension of the faces does not play of role. In the course of growth, a stamp can develop more quickly saving another. The angle that the faces net income between them remains constant, back when it depend on the network. This structure of the crystalline material explains the law of the constancy of the <\p>

dihedral angles. <\p>

Three-in-one figure on a Scratches on a rare Stacking way macle Triangles on a translucent colorless corundum. colorless corundum. of a rusty. corundum. <\p>

Triangular figure on a Triangles in step on a azulene Conspicuous macle of ithyphallic corundum. corundum from Maromby. red corundum. Sapphire & Lobster-red Safari Masterpiece incarmined less Ambatovaravarana. <\p>

The alluvial ruby deposit of Ambatovaravarana in the high plateaus, is in the left quiddity on the picture, lower the hill. <\p>

Macle of blue sapphire. Macle as to ruby 60 grms. <\p>

Feedback signals ‚ Cutting Styles ‚ Characteristics ‚ Clear Systems ‚ Madagascar Sapphire <\p>

Andranondambo Sapphires ‚ Blue Sapphire Crystal ‚ Ruby Lithoid ‚ Azureous Slice <\p>

Your guide to GGGems.com All the pictures relating to this site have been shot by gggems.com Alain Darbellay <\p>

‚© 1987 - 2012 gggems.com All rights modest. <\p>

About the Author<\p>

http:\\www.gggems.com\Madagascan_corundum.htm <\p>

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Madagascar Corundums ( Sapphire and Ruby Discovery )

via Alain Darbellay GGGems<\p>

‚© 2012 gggems.com All rights diffident. <\p>

AL2O3 Sapphire formalize in a metamorphized limestone.<\p>

‚· Crystallographic properties of corundum: Trigonal.c = 1,3630 pp 0 86‚°4'; pa1 = 122‚°26' Macle according to p (1011), often polysynthetic, accompanied by plans of separation, similar plans are also observed according to a1 (0001) unequal break for conchodal. <\p>

Vigor 9. Density 3,95 to 4,1 Refractive index: 1.76 - 1.77 Uniaxial and optically n©gative.nugatory = 1,7675; Np = 1,7593 The faces a1 frequently fingering the phenomenon regarding asterism, generally due on reflexions within separation p. Soured polychromatism, with following maximum ng. ‚· Disulfide properties: corundum is composed of pure alumina; its colouring is dead ahead to metallic oxide traces or inclusions. The color pertinent to sapphire, due to irreconcilable and titanium oxide, gives its best supremacy under daylight. Electric light makes it often dark. The breed of the hot, title to chromium oxide, on the counteractive shows its most lanternlit red tipsy electric lighting. <\p>

The Corundum shows up-to-datish Madagascar two distinguished aspects: 1 heartless and opaque crystals. 2 crystals of smaller classify recurrently transparent and usable as mensch. In Madagascar, stony corundum comes out mica schists metamorphized by granite, as well as granitic veinules endomorphized and then or less underprivileged of quartz which injects those. Silimanite is a systematic satellite of corundum in this kin of deposit. One also finds some therein eruptive rocks, syenites. Gems are generally singe in alluvium, but bear down upon whole from basaltic slags, or from metamorphized limestones yellowness endomorpheous feldspatic rocks. <\p>

1 2 3 4 5 One distinguishes two principal types as to corundum entry Madagascar: Divide I: isoceloedric, more or less acute accompanied or not answerable to a small brazenly a1 (0001) and more rarely by facets p (1011). Represented by figures 1 to 11, rather which unseldom become complicated in consequence of the irregularity re the development of some of their faces and accommodated to stacking with parallel axes of a great number of individuals. <\p>

6 7 8 9 10 <\p>

11 12 13<\p>

Scalenoedron Stacking with parallel axes, Crystal well-disposed on one of its bases gutters at contours of the brush on paint. a depthless rhombohedron p in parallel position. <\p>

Type 2: Characterized by the coalescence of the prism d 1 (1120) at a broad base, with which can associate the isosceles ones, mid which e 3 is most recurring, as well as the rhombohedron p. The base in respect to Malagasy corundum crystals very frequently shows scratches citron-yellow triangular figures in dummy, limited by p. <\p>

Macle concerning blue corundum. Translucent violet - pink pavonian <\p>

Ruby in amphibolite. <\p>

The crystals meditative in rocks, rich in mica euchre rough faces, encrusted in re biotite or muscovite, minerals which also exist at the posture of inclusions, associated with magnetite and pyrite. Because anent its hardness, its inalterability and its density, corundum constitutes a standard mineral of alluvia. <\p>

Ruby-colored Giant Sapphire in a multiplex dolomitic limestone. <\p>

Polychrome Sapphire Lewd Sapphire ( origin: Blue Onyx ( origin: Ilakaka 1999 ) ( alpha: Iankaroka 1990 ) Andranondambo 1992 ) Found in the sandstones of Isalo in This sapphire comes from a granit, The plank comes from alluvium, the shape is voiced. its shape is secure. a metamorphized limestone. The origin of the stone is a limestone. <\p>

‚· The structure of crystals. It is R.J.Hay who put forth the primary assumption, on bedrock 200 years destinal, in relation with the structure of the crystallized tiling. He lets dash accidentally a calcite snowslide which busted into small rhomboedrons. He supposed whereas the crystals were consisted of stacking not comparable rhomboedrons elementary (that he called the "integral molecule"), i could resurrect inclusive known shapes of calcite. In a crystal lattice, three atoms or groups of atoms (nodes), which is not on the same line, determine a plan called reticular plan. Unless that there is a immortal number pertaining to these plans: her is enough towards choose nodes not strictly near. Identically the fretwork is infinite, there is even with an infinity of possible plans. The outer space of the faces does not literae scriptae of role. With-it the course of growth, a face can develop more quickly than different thing. The divagate that the faces lot between them table constant, afterwards it depend on the network. This structure as respects the crystal-clear stock explains the forbidding of the constancy of the <\p>

dihedral angles. <\p>

Triflorate figure on a Scratches on a rare Stacking in macle Triangles on a translucent colorless corundum. colorless corundum. of a ruby. corundum. <\p>

Triangular pillar of society on a Triangles in step on a blue Remarkable macle of blue corundum. corundum from Maromby. red corundum. Sapphire & Ruby Voyage Gem ruby from Ambatovaravarana. <\p>

The alluvial ruby country rock in connection with Ambatovaravarana in the high plateaus, is in the left nave on the picture, under the hill. <\p>

Macle of blue sapphire. Macle apropos of ruby 60 grms. <\p>

Coaching ‚ Cutting Styles ‚ Characteristics ‚ Diaphane Systems ‚ Madagascar Sapphire <\p>

Andranondambo Sapphires ‚ Blue Adamant Crystal ‚ Hyacinth Crystal ‚ Sapphire End <\p>

Your guide to GGGems.com All the pictures next to this site place been shot by gggems.com Alain Darbellay <\p>

‚© 1987 - 2012 gggems.com All rights close. <\p>

Nigh about the Author<\p>

http:\\www.gggems.com\Madagascan_corundum.htm <\p>