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Neptunite

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TPX768766

Neptunite

Rare Mineral

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: 
5.2 × 4.3 × 3.8 cm
Weight: 
76.00gr
Description

Very interesting specimen of neptunite crystals on natrolite matrix from this classic American site. All these pieces have been treated with hydrochloric acid to extract the crystals from the natrolite layer.

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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