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Ottensite

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Ottensite

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Description
Locality: 
Le Cetine Mine, Siena, Tuscany, Italy
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.5 × 2.5 × 2.5 cm
Description

specimen with many red-orange balls and aggregates of ottensite from pereta mine: the second occorrence for this rare mineral; the Na-dominant analogue of Cetineite

Mineral Data
What's on the rock

Ottensite

Formula: 
(Na,K)3Sb3+6(Sb3+S3)O9·3H2O
Strunz: 
2.MA.05
Hardness: 
3.5 - 0.0
Colour: 
red-brown
Type Locality: 
Qinglong Mine (Dachang Mine), Dachang Sb ore field, Qinglong Co., Qianxi'nan Autonomous Prefecture, Guizhou Province, China...

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