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Polylithionite & Sérandite

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STY137136

Polylithionite & Sérandite

Description Tabs

Description
Locality: 
Mont Saint-Hilaire, Montérégie, Québec, Canada
Size Range: 
Thumbnail (1-3cm)
Size: 
2.3 × 1.9 × 1.7 cm
Largest Crystal: 
1.00cm
Description

Nice, flaky polylithionite crystals up to 1cm and orange serandite crystals up to 3mm on a white natrolite (?) matrix. Also present on the specimen are black aegirine crystals and tiny red grains, which are possibly manganoneptunite crystals.

Mineral Data
What's on the rock

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

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
Styriamin

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