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Scorodite On Goethite

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PDM566371

Scorodite On Goethite

With Antique Label

Description Tabs

Description
Locality: 
Morro Velho Mine, Nova Lima, Minas Gerais, Brazil
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4 × 3.6 × 1.7 cm
Description

This is an old piece from a very unusual locality* that features glassy lustrous slightly translucent blue crystals of scorodite to 5 mm, scattered over a botryoidal goethite matrix. A really hard to see scorodite from this locality. This one is from an unidentified old Italian collection as revealed by the two old labels. The oldest one corresponds to Julius Böhm, a dealer from Viena, who used this label with the "Nibelungengasse" address in the period of 1925-1938.

*The given locality is Morro Velho mine, but it could be from the nearby Ouro Preto, both inside the Iron Quadrangle in Minas Gerais.

Mineral Data
What's on the rock

Scorodite

Formula: 
Fe3+AsO4·2H2O
Strunz: 
8.CD.10
Crystal System: 
Orthorhombic
Hardness: 
3.5 - 4.0
Type Locality: 
Stamm Asser Mine, Graul, Langenberg, Schwarzenberg District, Erzgebirge, Saxony, Germany

Goethite

Formula: 
α-Fe3+O(OH)
Strunz: 
4.00.
Crystal System: 
Orthorhombic
Hardness: 
5.0 - 5.5
Type Locality: 
Hollertszug Mine (Hollerter Zug Mine), Dermbach, Herdorf, Siegerland, Rhineland-Palatinate, Germany

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