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Neptunite

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PDM791890

Neptunite

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Description
Locality: 
San Benito County, California, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.7 × 2.2 × 1.8 cm
Largest Crystal: 
2.00cm
Description

Black lustrous, perfectly and richly terminated crystal of neptunite, popping up a snow white matrix of natrolite with some benitoite visible at the border. It is aesthetically placed at the centre of the matrix and free of damages!.

Ex. René Virlet specimen, who exchanged it with Martin Ehrmann in 1971.

Mineral Data
What's on the rock

Neptunite

Formula: 
Na2KLi(Fe2+,Mn2+)2Ti2(Si8O24)
Strunz: 
9.EH.05
Hardness: 
5.0 - 6.0
Colour: 
Black
Type Locality: 
Narsaarsuk pegmatite (Narssârssuk pegmatite), Narsaarsuk Plateau, Igaliku (Igaliko), Narsaq, Kujalleq, Greenland

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