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Gibbsite

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PDM881443

Gibbsite

Fluorescent

Description Tabs

Description
Locality: 
Ouro Preto, Minas Gerais, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.6 × 4.9 × 5.2 cm
Weight: 
148.00gr
Description

Nodular aggregate of gibbsite composed of white banded fibrous crystals with a partial oxide coating at the external layer. Under long UV illumination it shows a whitish fluorescence. It turns green under short ultraviolet light.

Ex Robert Jakob specimen.

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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