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Rankachite

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JYJ1163470

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Description
Locality: 
Clara Mine, Oberwolfach, Freiburg Region, Baden-Württemberg, Germany
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1.5 × 0.8 cm
Description

A fine specimen of rankachite displaying a well-developed radiating spray of slender, dark brown to nearly black prismatic crystals, set on a contrasting light-colored matrix. The radiating crystal aggregate forms a fan-like structure, a classic and visually appealing habit for this rare mineral.

This specimen originates from the Clara Mine, Oberwolfach, Freiburg Region, Baden-Württemberg, Germany, one of the world’s most important and prolific localities for rare and complex secondary minerals. Rankachite is a rare hydrated copper arsenate mineral, typically occurring as a secondary phase formed by the alteration of primary arsenic- and copper-bearing minerals under oxidizing conditions.

The Clara Mine is the type locality for numerous rare species and is especially renowned for producing rankachite specimens with well-defined radiating crystal habits, which are uncommon worldwide. Due to its rarity and limited occurrence, rankachite is primarily of interest to advanced collectors and systematic mineralogists.

Mineral Data
What's on the rock

Rankachite

Formula: 
Ca0.5(V4+,V5+)(W6+,Fe3+)2O8(OH)·2H2O
Strunz: 
7.GB.25
Crystal System: 
Orthorhombic
Hardness: 
2.5
Type Locality: 
Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany

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Start 27 Jan 19:00
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Shipping Information

Postage Area Price
Germany: Insured parcel 6,20€
€6.20
International Warenpost tracked, not insured max 1 kg - 11€
€11
EU insured parcel - 15€
€15
Worldwide < 5000g insured parcel (UPS/TNT/DHL) 50€
€50
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