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underthescopemineral

Fluorite, Limonite

CaF2, (Fe,O,OH,H2O)

Locality:

Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany

Field of view: 1 mm

Fluorite on limonite.

Photo by Karlheinz Grosch

Fluorite is a very popular mineral, and it naturally occurs in all colors of the spectrum. It is one of the most varied colored minerals in the mineral kingdom, and the colors may be very intense and almost electric. Pure Fluorite is colorless; the color variations are caused by various impurities. Some colors are deeply colored, and are especially pretty in large well-formed crystals, which Fluorite often forms.

Limonite is scientifically not considered a true mineral as it lacks a definitive chemical formula and crystal structure. However, all mineral reference guides list it together with other minerals. Limonite is a matrix base of many other minerals, and the term gossan is used as a reference to Limonite when it is used as a a matrix for another mineral or has formed an undesirable staining on top of it.

brett-outdoors

Many fungi are geotropic, orienting themselves with respect to gravity. This polypore originally grew when the tree was upright. After the tree fell, new pore surfaces grew orthogonally to the old surface.