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Segnitite Clara Mine, Wolfach, Black Forest, Baden-Württemberg, Germany

#minerals #mineral #crystals #crystal #segnitite

Segnitite, Mimetite

PbFe3+3(AsO4)2(OH,H2O)6, Pb5(AsO4)3Cl

Locality:

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

Field of View: 4.44 mm

A greenish mineral of the beudantite-segnitite series together with prismatic transparent yellow mimetite crystals.

Photo: Michael Förch

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Segnitite, Mimetite

PbFe3+3(AsO4)2(OH,H2O)6, Pb5(AsO4)3Cl

Locality:

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

Field of View: 1.31 mm

A yellow mineral of the beudantite-segnitite series on prismatic transparent light yellow mimetite crystals.

Photo: Michael Förch

The segnitite is a mineral belonging to the group of dussertite. The arsenate analogue of kintoreite. Difficult to distinguish from beudantite, with which it forms a series.

Mimetite is a secondary mineral found in the oxidized zones of lead deposits. Usually found as small hexagonal prisms, often plain but may be modified, sprinkled on the matrix thinly to thickly. Its color is quite variable, ranging from pale yellow to yellowish-brown to orange-yellow to orange-red, brownish, greenish, white and colorless. Because of their high density and color banding, these may be mistaken for the "wood tin" variety of cassiterite, or the "schalenblende" variety of sphalerite/wurtzite.