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Melanterite Var Pisanite

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SCH76425

Melanterite Var Pisanite

Description Tabs

Description
Locality: 
Rio Tinto Mines, Huelva, Andalusia, Spain
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.2 × 3.5 × 2.9 cm
Description

A colourful specimen of pisanite with a flat surface hosting several stalactitic growths of a lovely blue-green color due to the presence of copper. It can be noted some external faces, but very rounded.

These kind of specimens were found in big puddles, in where the concentration of iron sulphate is bigger than its solubility in water. Analysis of these puddles show that the pH was near 1.

The specimen was sealed when collected in 1999 and it looks like the first day. 

Mineral Data
What's on the rock

Melanterite

Formula: 
FeSO4·7H2O
Strunz: 
7.CB.35
Hardness: 
2.0
Streak: 
White.

Pisanite

Synonym Of: 

Cuprian Melanterite

Formula: 
(Fe,Cu)SO4·7H2O
Hardness: 
0.0
schani