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Sérandite Polylithionite & Leucophanite

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SYM771019

Sérandite Polylithionite & Leucophanite

Rare Mineral

Description Tabs

Description
Locality: 
Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1 × 1 cm
Description

Polylithionite rosettes with crystals of leucophanite on serandite. 

Mineral Data
What's on the rock

Sérandite

Formula: 
Na(Mn2+,Ca)2(HSi3O9)
Strunz: 
9.DG.05
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Rouma Island (Roume Island; Roma Island; Ruma Island), Los Archipelago (Los Islands), Guinea

Polylithionite

Formula: 
KLi2Al(Si4O10)(F,OH)2
Strunz: 
9.EC.20
Hardness: 
2.0 - 3.0
Type Locality: 
Kangerluarsuk Fjord (Kangerdluarssuq Fjord), Ilímaussaq complex, Narsaq, Kujalleq, Greenland

Leucophanite

Formula: 
NaCaBeSi2O6F
Strunz: 
9.DH.05
Hardness: 
4.0
Streak: 
white
Type Locality: 
Låven (Skådön; Lamö; Lamanskjaer), Langesundsfjorden, Larvik, Vestfold, Norway