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Benitoite Neptunite & Joaquinite-(Ce)

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WND787666

Benitoite Neptunite & Joaquinite-(Ce)

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 miniature (3-4.5 cm)
Size: 
3.7 × 3.2 × 2.1 cm
Description

What a fine specimen,- one major crystal of well defined, blue rare benitoite associated with many, black and mirror bright crystals of neptunite on typically matrix. The main crystal of neptunite is doubly terminated and exceeding well developed as well. Both minerals are razor sharp and excellent terminated. A dramatically combination piece in splendid condition.  Very hard to get such super specimens nowadays. As a small ecore you can find a few, small but distinct crystals of rare Joaquinite-(Ce) as brown individuals. This place is type locality for this species as well.

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

Joaquinite-(Ce)

Formula: 
NaBa2Ce2FeTi2[Si4O12]2O2(OH,F)·H2O
Strunz: 
9.CE.25
Hardness: 
5.0 - 5.5
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

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Start 28 Jun 18:00
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