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Cobaltite With Erythrite & Pharmacosiderite

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LGM650508

Cobaltite With Erythrite & Pharmacosiderite

Ex Dr. Krantz, Bonn, Germany
With Antique Label

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Description Tabs

Description
Locality: 
Dashkesan, Daşkəsən District, Azerbaijan
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
5.5 × 9.5 × 3 cm
Weight: 
300.00gr
Description

Old time specimen from Dashkesan in modern Azerbaijan, former governorate Tiflis, an administrative unit of the general governorate Caucasus in the former russian empire which exists before WW I.
The specimen features a few well-developed cobaltite crystals, purple crusts of erythrite (possibly as alteration product) and lawns of tiny green pharmacosiderite crystals on chlorite schist. Despite some cracks, this specimen is stable.

An interesting historic specimen which comes with two antique labels, one stamp-like typewriter label and one Dr. F. Krantz pen&ink label dated 1900-1920.

Mineral Data
What's on the rock

Cobaltite

Formula: 
CoAsS
Strunz: 
2.EB.25
Crystal System: 
Orthorhombic - Pyramidal
Hardness: 
5.5

Erythrite

Formula: 
Co3(AsO4)2·8H2O
Strunz: 
8.CE.40
Hardness: 
1.5 - 2.5
Type Locality: 
Daniel Mine (St. Daniel Mine), Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany

Pharmacosiderite

Formula: 
KFe3+4(AsO4)3(OH)4·6-7H2O
Strunz: 
8.DK.10
Hardness: 
2.5
Streak: 
white
Type Locality: 
Carharrack Mine, St Day United Mines (Poldice Mines), Gwennap, Camborne - Redruth - St Day District, Cornwall, England, UK

Seller Information

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