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Mckelveyite-(Y) Natrolite & Calcite

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ESM503556

Mckelveyite-(Y) Natrolite & Calcite

Rare Mineral

Description Tabs

Description
Locality: 
Kukisvumchorr Mountains, Khibiny Massif, Murmansk Oblast, Russian Federation
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.2 × 2.7 × 1.7 cm
Description

Yellow Mckelveyite- (y) crystals with calcite blades and natrolite needles on matrix

Mineral Data
What's on the rock

Mckelveyite-(Y)

Formula: 
NaCaBa3Y(CO3)6·3H2O
Strunz: 
5.CC.05
Hardness: 
3.5 - 4.0
Type Locality: 
Diamond Alkali Daco No. 3, Green River Formation, Sweetwater Co., Wyoming, USA

Natrolite

Formula: 
Na2Al2Si3O10·2H2O
Strunz: 
9.GA.05
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Hohentwiel, Singen, Hegau, Baden-Württemberg, Germany

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White