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Quartz With Petroleum

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PDM888587

Quartz With Petroleum

Floater

Description Tabs

Description
Locality: 
Dakhlet Nouadhibou, Dakhlet Nouadhibou Region, Mauritania
Class: 
Single Crystal
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.7 × 3.1 × 2.4 cm
Weight: 
29.00gr
Description

From a recent find in the West region of Mauritania, coming directly from a local miner, this is a gemmy Herkimer-type diamond quartz, with transparent oily inclusions that are strongly fluorescent in white-blue 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, such as this one but with no fluorescent inclusions. This floater piece is also rich in gas bubbles and other transparent inclusions that are not fluorescent, and black flattened inclusions. I selected this piece because of the size, transparency, richness in fluorescent inclusions and condition, but they usually have some erosions of 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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