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Bournonite Tetrahedrite Sphalerite & Quartz

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SCH76433

Bournonite Tetrahedrite Sphalerite & Quartz

Description Tabs

Description
Locality: 
Pachapaqui District, Bolognesi Province, Ancash Department, Peru
Size Range: 
Cabinet (10-18 cm)
Size: 
10.6 × 5.3 × 5.9 cm
Description

Dark metallic bournonite crystals up to 5 mm long mixed with milky quartz crystals up to 3 mm. The bournonite crystals are heavily striated, the result of complex twinning. Several bright tetrahedrite crystals are present as are many small shiny black sphalerites.

Classic combination.

Mineral Data
What's on the rock

Bournonite

Formula: 
PbCuSbS3
Strunz: 
2.GA.50
Hardness: 
2.5 - 3.0
Type Locality: 
Wheal Boys (Trewetha Mine; Old Trewetha Mine), Port Isaac, St Endellion, Wadebridge District, Cornwall, England, UK

Tetrahedrite

Formula: 
Cu6[Cu4(Fe,Zn)2]Sb4S13
Strunz: 
2.GB.05
Hardness: 
3.5 - 4.0

Sphalerite

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

Quartz

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

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