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Quartz With Petroleum

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PDM751772

Quartz With Petroleum

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Description
Locality: 
Dakhlet Nouadhibou Region, Mauritania
Class: 
Single Crystal
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.8 × 2.7 × 2.4 cm
Description

Big crystal from a new find in the West region of Mauritania, coming directly from a local miner. It is a gemmy Herkimer-type diamond quartz, with bubbles of green and yellow petroleum inclusions that are fluorescent in white under UV light. I have seen about 50 pieces and they are usually smaller than 30 mm. Typical pieces from this locality are very rich in black flattened inclusions, mostly parallelly oriented to the rhombohedral faces, and they are not fluorescent. I selected these pieces because of the size and gemmyness, they are rich in fluorescent inclusions and they are in good condition, but they usually contain chippings in different degree, probably because locals are not use to manage specimens for collectors.

Found in October 2019.

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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