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Eirikite & Polylithionite

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RMM108160

Eirikite & Polylithionite

Rare Mineral

Description Tabs

Description
Locality: 
Mont Saint-Hilaire, Montérégie, Québec, Canada
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.5 × 5 × 5 cm
Largest Crystal: 
2.00cm
Description

Radiating sprays of eirikite crystals to 2.0 cm with pearly sheets of polylithionite from the famous Mount Saint Hilaire. EDS indicates significant K which suggests the dominant species is eirikite, however, this does not rule out the possible presence of leifite which is commonly associated with eirikite. A copy of the EDS report is available upon request.

Mineral Data
What's on the rock

Eirikite

Formula: 
KNa6Be2(Si15Al3)O39F2
Strunz: 
9.EH.25
Hardness: 
6.0 - 0.0
Streak: 
White
Type Locality: 
Eudidymite-Epididymite locality, Vesle Arøya, Langesundsfjorden, Larvik, Vestfold, Norway

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

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