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Topaz & Elbaite

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PDM741861

Topaz & Elbaite

Classic Locality

Description Tabs

Description
Locality: 
Viitaniemi Pegmatite, Eräjärvi, Orivesi, Pirkanmaa, Finland
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 6.3 × 4.2 cm
Largest Crystal: 
4.00cm
Description

Well-developed pale yellow coloured topaz crystals, some large ( up to 40 mm) and exceptionally well terminated for the locality. It is formed by the prisms {120} and {110}, modified by {101}, and a good development of the {021}. Some small pieces are missing at the base, but it is in very good condition for the locality because they are very difficult to extract undamaged from the quartz matrix. Some green elbaites are also present.

It was collected on June 30th/1977 by Manfred Fabig.

Mineral Data
What's on the rock

Topaz

Formula: 
Al2(SiO4)(F,OH)2
Strunz: 
9.AF.35
Crystal System: 
Orthorhombic - Dipyramidal
Hardness: 
8.0
Streak: 
White

Elbaite

Formula: 
Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
Strunz: 
9.CK.05
Hardness: 
7.5
Streak: 
White
Type Locality: 
Fonte del Prete, San Piero in Campo, Campo nell'Elba, Elba Island, Livorno Province, Tuscany, Italy...

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