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Neptunite

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ATM1086874

Description Tabs

Description
Locality: 
California State Gem Mine, San Benito County, California, United States of America
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
3.11 × 5.54 × 3.38 cm
Largest Crystal: 
1.54cm
Description

Lustrous Black terminated prismatic Neptunite.  Crystals on Natrolite matrix from San Benito.  Some crystals have appearance of being broken but result from reveal after being etched from the Natrolite. As images.

Ex my personal collection.  C482

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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