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Fluorcalcioroméite Oxyplumboroméite & Baryte

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SKY724475

Fluorcalcioroméite Oxyplumboroméite & Baryte

Rare Mineral

Description Tabs

Description
Locality: 
Santa Matilde Open Pit, Berja Mines, Las Herrerías, Sierra Almagrera, Almería, Andalusia, Spain
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8 × 6 × 4 cm
Description

At the beginning of 2014, reviewing some specimens from the Santa Matilde open pit we found into the vugs some groups of lanceolated, fibrous or equidimensional crystals, with pink, beige to white colours, those aroused our interest. After some analysis we could identify as fluorcalcioroméite species (Ca,Na)2Sb5+2O6F,OH), with a small percentage of oxyplumboroméite (Pb2Sb2O7, due to the presence of lead). Both species belong to the isometric system.

But the observed symmetry indicated that they are, highly probable, a pseudomorph after stibnite crystals. This is the first report of this mineral in the Iberian Peninsula. Nowadays this quarry is completelly filled by rubble. In this specimen we can see a vug with rich aggregates formed by lanceolated to fibrous crystals, with luster, beige to pink color, accompanied by aesthetic baryte crystals. 

Analyzed specimen.

Mined: 2004

Mineral Data
What's on the rock

Fluorcalcioroméite

Formula: 
(Ca,Na)2Sb5+ 2O6(F,OH)
Hardness: 
5.5 - 0.0
Streak: 
White
Type Locality: 
Starlera Mine, Starlera Valley, Ferrera Valley, Hinterrhein Valley, Grischun (Grisons; Graubünden), Switzerland

Baryte

Formula: 
BaSO4
Strunz: 
7.AD.35
Hardness: 
3.0 - 3.5
Streak: 
White

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