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Chrysocolla Psm & Plancheite Cast

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KMF653931

Chrysocolla Psm & Plancheite Cast

Pseudomorph

Description Tabs

Description
Locality: 
Lupoto Mine, Kakumba, Kipushi, Haut-Katanga, DR Congo
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
9 × 8 × 6 cm
Description

A three dimensional specimen from the second find form the Lupoto mine features pale botryoidal plancheite casts that retain the original scalenohedral calcite crystal forms that lay beneath now completely dissolved away leaving a dusty brown mineralization behind. 

The casts host a rich mass of vibrant turquoise colored chrysocolla replacements after selenite (in my opinion based on what I have seen) the original prismatic crystal structures are retained consisting of an internal malachite core coated with microvilli like fingers that extend radiating outwards on all exposed surfaces.

Some minor secondary malachite coatings as well as an unknown botryoidal metallic mineralization can be found on surface under close scrutiny.

The condition is very good with attachment related contacts only.

Mineral Data
What's on the rock

Chrysocolla

Formula: 
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (x < 1)
Strunz: 
9.ED.20
Crystal System: 
Monoclinic
Hardness: 
2.5 - 3.5

Plancheite

Formula: 
Cu8(Si8O22)(OH)4·H2O
Strunz: 
9.DB.35
Crystal System: 
Orthorhombic
Hardness: 
6.0
Type Locality: 
Sanda carriere (Sanda quarry; Sanda Mine), Mindouli, Mindouli District, Pool Department, Republic of Congo (Brazzaville)

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