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Jonesite & Neptunite

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CR1024136

Jonesite & Neptunite

Rare Mineral

Description Tabs

Description
Locality: 
Mina Numero Uno, Picacho Peak, San Benito County, California, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.3 × 2 × 2 cm
Description

A beautiful small jonesite crystal sitting on a neptunite.

Nice specimen of the very rare mineral.

Mineral Data
What's on the rock

Jonesite

Formula: 
Ba4(K,Na)2Ti4Al2(Si3O9)2(SiO4)4O2·6H2O
Strunz: 
9.DJ.30
Hardness: 
3.0 - 4.0
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