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Fluorapatite & Bertrandite

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PDM782598

Fluorapatite & Bertrandite

Description Tabs

Description
Locality: 
Bom Sucesso #4 Quarry, Chãs de Tavares, Mangualde, Viseu District, Portugal
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.2 × 2.3 × 1.6 cm
Largest Crystal: 
1.10cm
Description

If we think about fluorapatite from Portugal we go instinctively to Panasqueira …. but no, this is not from there!. It was found on April 13th 2013 by a well-known Spanish prospector at the Bom Sucesso No. 4 Quarry.

This nice specimen features aggregates of intergrown, attractive blue-grey coloured, short prismatic crystals of fluorapatite richly associated to tabular transparent crystals of bertrandite. The fluorapatites present well-defined edges, with striated faces and superb the lustre!. The specimen is crystallized also at the rear, with smaller fluorapatite crystals on yellowish muscovite all around.

Furthermore these fluorapatite reacts to ultraviolet light turning deep orange in colour. Good quality specimen from an uncommon locality that unfortunately is already inaccessible for collectors.

Mineral Data
What's on the rock

Fluorapatite

Formula: 
Ca2Ca3(PO4)3F
Strunz: 
8.BN.05
Crystal System: 
Hexagonal
Hardness: 
5.0
Streak: 
White
Type Locality: 
Sauberg Mine, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany

Bertrandite

Formula: 
Be4(Si2O7)(OH)2
Strunz: 
9.BD.05
Crystal System: 
Orthorhombic
Hardness: 
6.0 - 7.0
Type Locality: 
Petit-Port, Nantes, Loire-Atlantique, Pays de Loire, France

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