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Macaulayite

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SKY898373

Macaulayite

Rare Mineral

Description Tabs

Description
Locality: 
Aberdeenshire, Scotland, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.7 × 1 × 0.8 cm
Description

Very dark red, almost black, microcrystals of the rare mineral macaulyite on a contrasting matrix of illite and kaolinite.

Specimens of this mineral species in matrix are rarely seen on the mineral market.

Mineral Data
What's on the rock

Macaulayite

Formula: 
(Fe,Al)24Si4O43(OH)2
Strunz: 
9.EC.65
Crystal System: 
Monoclinic
Hardness: 
0.0
Colour: 
Red
Type Locality: 
Bennachie, Inverurie, Buchan Grampian (Aberdeenshire), Scotland, UK

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