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Rasvumite & Ershovite

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SKY830413

Rasvumite & Ershovite

Type Locality

Description Tabs

Description
Locality: 
Khibiny Massif, Murmansk Oblast, Russian Federation
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.6 × 1.4 × 1.2 cm
Description

Brown fairly sharp crystals of the very rare mineral rasvumite (photo 1) associated to yellow crystal aggregates of ershovite from the famous Khibiny area.

Rasvumite is one of the very few sulphides containing potassium (KFe2S3). Rasvumite crystals in this quality are rarely seen in the mineral market.

Ex Vandenbroucke Museum collection from Waregem, Belgium.

Mineral Data
What's on the rock

Rasvumite

Formula: 
KFe2S3
Strunz: 
2.FB.20
Crystal System: 
Orthorhombic
Hardness: 
4.0 - 5.0
Type Locality: 
Kirovskii apatite mine (Kirovsky Mine; Kirovskii Mine; Kirov Mine), Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia...

Ershovite

Formula: 
Na4K3(Fe,Mn,Ti)2Si8O22(OH)4·4H2O
Strunz: 
9.DF.15
Hardness: 
2.0 - 3.0
Streak: 
White
Type Locality: 
Koashva quarry, Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia...
Not Sold

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