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Epididymite & Sérandite

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SYM788497

Epididymite & Sérandite

Rare Mineral

Description Tabs

Description
Locality: 
Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1 × 0.5 cm
Description

White hexagonal crystals of epididymite with serandite. 

Mineral Data
What's on the rock

Epididymite

Formula: 
Na2Be2Si6O15·H2O
Strunz: 
9.DG.55
Crystal System: 
Orthorhombic
Hardness: 
5.5
Type Locality: 
Narsaarsuk pegmatite (Narssârssuk pegmatite), Narsaarsuk Plateau, Igaliku (Igaliko), 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