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Ranciéite & Gearksutite

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SHS133863

Ranciéite & Gearksutite

Description Tabs

Description
Locality: 
La Fossa Crater, Vulcano Island, Aeolian Islands, Sicily, Italy
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1.5 × 1.1 cm
Description

Ranceite and gearksutite and andesine in matrix

Mineral Data
What's on the rock

Ranciéite

Formula: 
(Ca,Mn)Mn4O9·3H2O
Strunz: 
4.FL.40
Crystal System: 
Hexagonal
Hardness: 
2.5 - 3.0
Type Locality: 
Le Rancié Mine, Sem, Vicdessos, Ariège, Midi-Pyrénées, France

Gearksutite

Formula: 
Ca[Al(F,OH)5(H2O)]
Strunz: 
3.CC.05
Hardness: 
2.0
Streak: 
white
Type Locality: 
Ivigtut Cryolite deposit, Ivittuut (Ivigtut), Arsuk Fjord, Sermersooq, Greenland
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