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Thomsonite-Ca & Calcite

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MNT101837

Thomsonite-Ca & Calcite

ex Feodor Wiedemann, GER
Classic Locality

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Description
Locality: 
Mariánská Skála, Ústí nad Labem District, Ústí nad Labem Region, Czech Republic
Size Range: 
Cabinet (10-18 cm)
Size: 
10.5 × 5.5 × 6 cm
Description

Nice late 19th century old timer from Marianska Hora in Bohemia: a vug in andesite hosts nicely developed Thomsonite-Ca pseudo-/perimorphing calcite. Wiedemann label attached with the old synonym comptonite for the thomsonite. 370 g.

Mineral Data
What's on the rock

Thomsonite-Ca

Formula: 
NaCa2[Al5Si5O20]·6H2O
Strunz: 
9.GA.10
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Old Kilpatrick, Strathclyde (Dunbartonshire), Scotland, UK

Calcite

Polymorph of: 
Aragonite and Vaterite
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

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Thank you for your interest in my offers! Payment is possible via Paypal, bank transfer or cash if you pick up the item(s) personally. Bank data will be provided after settling the auction/transaction(s) if needed.

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Best regards Roger

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