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Serpentine Group With Hydrotalcite

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LGM515318

Serpentine Group With Hydrotalcite

Ex Dr. Krantz, Bonn, Germany
With Antique Label

Description Tabs

Description
Locality: 
Snarum, Modum, Buskerud, Norway
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.5 × 6.5 × 5 cm
Weight: 
139.00gr
Description

Gemmy serpentine "crystals" pseudomorph after olivine. The white parts with silky luster are hydrotalcite.

Comes with exceptional large and beautiful antique label dated 1900, with detailled description and chemical formula, mostly in old german Sütterlin script.
"Voelknerit" is an old synonym for hydrotalcite.
"Pikrosmin" is an old synonym for chrysotile.

The label means:
Edler ("precious") Serpentin und Hydrotalkit (Voelknerit)
Snarum Norwegen

Serpentin Si2O4Mg3H4 hydrat. 1 Mol H2O
[first 4 words not decipherable] erst bei starkem Glühen und kann aufgefasst werden als Verbindung (only at strong annealing and can be seen as a compound of):
1 Mol Pikrosmin Si2O5(MgOH)2 mit (with)
1 Mol Brucit Mg(OH)2

Hydrotalkit Al(OH)3 x 3 Mg(OH)2 + 3 H2O:
ist mehrheitlich ein Gemenge von (is mostly a mixture of)
Hydrargyllit Al(OH)3 = Al2O3 x 3 H2O und
Brucit Mg(OH)2 = MgO x H2O

Mineral Data
What's on the rock

Hydrotalcite

Formula: 
Mg6Al2(OH)16[CO3]·4H2O
Strunz: 
5.DA.50
Crystal System: 
Trigonal
Hardness: 
2.0
Streak: 
White
Type Locality: 
Dypingdal Serpentine-magnesite deposit, Snarum, Modum, Buskerud, Norway

Seller Information

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