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Birnessite Psm Sérandite

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SKI591234

Birnessite Psm Sérandite

Pseudomorph

Description Tabs

Description
Locality: 
Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 3.5 × 2 cm
Largest Crystal: 
3.30cm
Description

Dark brownish-black birnessite has replaced primsatic serandite crystals. This specimen shows a beautiful spray of crystals standing up to 3.3 cm.

Similar specimens are linked to Roland Bouheliers early 1970s "lucky days". According to the type of label this specimen might be one of the "lucky" ones.

See attached a XRFA qualitative analyse of this specimen.

Mineral Data
What's on the rock

Birnessite

Formula: 
(Na,Ca)0.5(Mn4+,Mn3+)2O4·1.5H2O
Strunz: 
4.FL.45
Crystal System: 
Orthorhombic
Hardness: 
1.5
Type Locality: 
Birness, Ellon, Buchan Grampian (Aberdeenshire), Scotland, UK

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

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