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Quartz

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PDM719838

Quartz

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Description
Locality: 
Mount Malosa, Zomba, Southern Region, Malawi
Class: 
Single Crystal
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.3 × 0.4 × 0.4 cm
Description

Prismatic crystal of quartz of black colour probably due to inclusions of aeginine and/or arfvedsonite crystals. I found this in a box with aegirine crystals when preparing thin sections for students in the Complutense University of Madrid.

Mineral Data
What's on the rock

Quartz

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

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