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Garnierite

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LGM957457

Garnierite

Ex Dr. Krantz, Bonn, Germany
With Antique Label

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Description Tabs

Description
Locality: 
Nouméa Commune, Southern Province, New Caledonia
Class: 
Massive/Crystalline
Size Range: 
Cabinet (10-18 cm)
Size: 
6.5 × 12 × 5 cm
Weight: 
330.00gr
Description

Massive garnierite, a green nickel ore which has formed as a result of lateritic weathering of ultramafic rocks (serpentinite, dunite, peridotite). Mostly a mixture of various Ni- and Ni-bearing magnesium layer silicates, associated with minor red-brown hematite stains.

Jules Garnier, a French geologist, published his work on the geology of New Caledonia in 1867, announcing the discovery of nickel there. Garnierite was named for Jules Garnier in a paper by A. Liversidge in 1874. It once was an important nickel ore, having a large weight percent NiO.

Apparently under modern reclassification this is no longer a species. It is considered a mix of green nickel minerals formed from weathering and may consist of williamseite, nepouite, and pimelite.

Mineral Data
What's on the rock

Garnierite

Synonym Of: 

Népouite

Formula: 
(Ni,Mg)3(Si2O5)(OH)4
Strunz: 
9.ED.15
Hardness: 
2.0 - 2.5

Pimelite

Willemseite

Formula: 
(Ni,Mg)3(Si4O10)(OH)2
Strunz: 
9.EC.05
Hardness: 
0.0

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