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Benitoite & Neptunite

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WND818173

Benitoite & Neptunite

Rare Mineral - Type Locality
Classic Locality

Description Tabs

Description
Locality: 
Dallas Gem Mine, San Benito County, California, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
9.4 × 4.7 × 1.7 cm
Description

Numerous of excellent developed crystals and clusters of sharp and grayish blue rare Benitoite accompanied by black and also well developed Neptunite. The Neptunite is scattered like straw over the matrix. The Benitoite is sharp edged, highly lustrous and mostly undamaged. A very good specimen from the old and great times.

Mineral Data
What's on the rock

Benitoite

Formula: 
BaTi(Si3O9)
Strunz: 
9.CA.05
Crystal System: 
Hexagonal
Hardness: 
6.0 - 6.5
Type Locality: 
California State Gem Mine (Dallas Gem Mine; Benitoite Mine; Benitoite Gem Mine; Gem Mine), Dallas Gem Mine area, San Benito River headwaters area, New Idria District, Diablo Range, San Benito Co., California, USA

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
Wendel Minerals

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