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Pimelite

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PDM839035

Pimelite

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Description
Locality: 
Cerro Matoso, Montelíbano, Córdoba Department, Colombia
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.7 × 6 × 4.4 cm
Description

Piece of brown laterite rock with veins of apple green "garnierite” from Cerro Matoso, a huge nickel deposit in an altered laterite.

From my own collection, it is part of a big specimen I received as a present from Prof. Dr. Lorenzo Barraza in 11/1998, while I was completing my studies in Colombia at the University of Antioquia in Medellín.

According to Gleeson et al., 2004, these "garnierites” are indeed banded pimelite. The Cerro Matoso deposit is an isolated outcrop of peridotite that have been assigned to the Cauca ophiolite complex of Cretaceous age. This specimen is from the so called “Green saprolite”. This rock type is green and is fine grained and soft, but it contains quartz and “garnierite” veining and local stockworks. Green saprolite has the highest Ni grades (up to 9 wt % Ni) and is the ore horizon in the mine.

Gleeson, S.A.; Herrington, R.J.; Durango, J.; Velásquez, C.A. & Koll, G. (2004). The Mineralogy and Geochemistry of the Cerro Matoso S.A. Ni Laterite Deposit, Montelíbano, Colombia. Economic Geology, 99, 6, 1197–1213.

Mineral Data
What's on the rock

Pimelite

Group Parent: 
Smectite Group

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