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Retinite

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PDM777969

Retinite

Classic Locality

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Description
Locality: 
La Colle de la Motte, Les Adrets-de-l'Estérel, Var, Provence-Alpes-Cote d'Azur, France
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.3 × 3 × 2.5 cm
Description

Light block of black obsidian variety “retinite” with characteristic conchoidal fracture. The internal structures is clearly formed by spheroidal particles that are indeed typical of devitrified volcanic glasses type obsidian. Classic locality for retinite.

Do not mistake this type of obsidian with the homonymous carbon type “retinite”, highly appreciated because of its hight calorific value.

Ex. PhD Geologist Bob Janssens #2643.

Mineral Data
What's on the rock

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