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Sérandite Aegirine & Benitoite

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RBR136667

Sérandite Aegirine & Benitoite

Type Locality

Description Tabs

Description
Locality: 
San Benito, San Benito County, California, United States of America
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.5 × 5 × 3 cm
Description

This combination of minerals is not common for the San Benito mine. Aegirine and serandite are developed as small needles situated close to each other which gives a nice contrast. Some benitoite is also present.

Mineral Data
What's on the rock

Sérandite

Formula: 
Na(Mn2+,Ca)2(HSi3O9)
Strunz: 
9.DG.05
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Rouma Island (Roume Island; Roma Island; Ruma Island), Los Archipelago (Los Islands), Guinea

Aegirine

Formula: 
NaFe3+Si2O6
Group Parent: 
Clinopyroxene Subgroup
Strunz: 
9.DA.25
Crystal System: 
Monoclinic
Hardness: 
6.0
Type Locality: 
Rundemyr, Øvre Eiker, Buskerud, Norway

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
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