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Changoite On Quartz Sphalerite & Galena

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PDM673229

Changoite On Quartz Sphalerite & Galena

Rare Mineral

Description Tabs

Description
Locality: 
Esperanza 2001 Mine, Huachocolpa District, Huancavelica Department, Peru
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.5 × 1.1 × 0.8 cm
Description

This is a very rare specimen, both for locality and species. It was collected by Cosme Pérez-Puig, a Spanish Mine engineer that worked at the mine when these specimens where found. The pale white changoite blocky crystals! are on a crust of white quartz that coats the matrix of orange sphalerite and grey galena. These specimens were analysed by XRD and XRF when found at the level 595 of the Esperanza Mine. From my own collection.

Results are published in: Pérez-Puig, Cosme R. & Yparraguirre Calderón, José A. (2013). El Distrito Polimetálico de Huachocolpa (Huancavelica, Perú). (in Spanish). ACOPIOS, 4, 1-57 pp. It can be read freely online.

Mineral Data
What's on the rock

Changoite

Formula: 
Na2Zn(SO4)2·4H2O
Strunz: 
7.CC.50
Crystal System: 
Monoclinic
Hardness: 
2.0 - 3.0
Colour: 
Colorless
Streak: 
White
Type Locality: 
Sierra Gorda District, Antofagasta Province, Antofagasta Region, Chile

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

Sphalerite

Formula: 
ZnS
Strunz: 
2.CB.05a
Crystal System: 
Isometric
Hardness: 
3.5 - 4.0

Galena

Formula: 
PbS
Strunz: 
2.CD.10
Crystal System: 
Isometric
Hardness: 
2.5
Colour: 
Lead-grey
Streak: 
Lead-grey

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