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Gibbsite

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CR1036195

Gibbsite

Type Locality

Description Tabs

Description
Locality: 
Richmond, Berkshire County, Massachusetts, United States of America
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6 × 4 × 4 cm
Description

From the type locality where it was first noted in 1822, this is a large and fine, aesthetic, drapery of the rare aluminum-containing species gibbsite upon host matrix.

It was named after Colonel George Gibbs (1777-1834), original owner of the Gibbs mineral collection acquired by Yale University early in the nineteenth century.

Gibbsite is an interesting aluminum hydroxide with very little heft to it, that otherwise tends to look like heavy smithsonite or hemimorphite at first glance. This specimen has an old an beautiful handwritten label.

 

Mineral Data
What's on the rock

Gibbsite

Formula: 
Al(OH)3
Strunz: 
4.FE.10
Hardness: 
2.5 - 3.0
Streak: 
White
Type Locality: 
Richmond, Berkshire Co., Massachusetts, USA

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Start 19 Apr 17:00
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