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Gearksutite Cryolite & Siderite

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MNT606723

Gearksutite Cryolite & Siderite

ex Dr. F. Krantz, Bonn, GER
Type Locality

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Description Tabs

Description
Locality: 
Ivigtut, Ivittuut, Arsuk Fjord, Sermersooq, Greenland
Class: 
Massive/Crystalline
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.6 × 7.5 × 5.2 cm
Description

From the type locality: a sample of cryolite with dark brown siderite contains whiteish powdery Gearksutite, a rare fluoride. At the cryolite deposit of Ivigtut it is one of the last formed secondary fluorides.

Mineral Data
What's on the rock

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

Cryolite

Formula: 
Na3[AlF6]
Strunz: 
3.CB.15
Crystal System: 
Monoclinic
Hardness: 
2.5
Streak: 
White
Type Locality: 
Ivigtut Cryolite deposit, Ivittuut (Ivigtut), Arsuk Fjord, Sermersooq, Greenland

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

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Terms & Conditions

Thank you for your interest in my offers! Payment is possible via Paypal, bank transfer or cash if you pick up the item(s) personally. Bank data will be provided after settling the auction/transaction(s) if needed.

In case you are not happy with a specimen, you may send it back within 4 weeks. After receipt, i will refund the price minus shipping costs. Please inform me before sending an item back. If you have any questions (or maybe complaints) please feel free to contact me.

Best regards Roger

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