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Osumilite

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TBM849221

Osumilite

Classic Locality

Description Tabs

Description
Locality: 
Mount Arci, Morgongiori, Oristano Province, Sardinia, Italy
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
5 × 9.5 × 5 cm
Weight: 
191.00gr
Description

Very  shiny black discoidal crystals up to 2 mm diameter. The crystals are implanted on carpet of hexagonal packs of Tridymite crystals.

Mineral Data
What's on the rock

Osumilite

Formula: 
(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30
Strunz: 
9.CM.05
Hardness: 
5.0 - 6.0
Colour: 
Blue
Type Locality: 
Sakkabira, Osumi Peninsula, Kagoshima Prefecture, Kyushu Region, Japan