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Harmotome

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SMM1080909

Description Tabs

Description
Locality: 
St Andreasberg, Goslar, Lower Saxony, Germany
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8 × 6 × 4 cm
Largest Crystal: 
0.70cm
Weight: 
351.00gr
Description

Excellent harmotome specimen, from a historical locality which is also its type locality.

Many harmotome crystals, scattered on a matrix rich in small tabular calcite crystals. Several harmotome crystals show the typical cross twinning, the largest measuring more than half a centimeter.

Very nice old specimen dating back, as written on the (not old) label, to the late 19th/early 20th century.

Previous labels supplied (not photographed)
Mineral Data
What's on the rock

Harmotome

Formula: 
(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] ·12H2O
Strunz: 
9.GC.10
Crystal System: 
Monoclinic
Hardness: 
4.0 - 5.0
Streak: 
White
Type Locality: 
St Andreasberg, St Andreasberg District, Harz, Lower Saxony, Germany

Current price

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38
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Start 06 Nov 18:00
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Shipping Information

Postage Area Price
Italy up to 100 g. €.9.00 - up to 250 g. €.10.00
10
Europe up to 100 g. €.12.00 - up to 250 €.14.00
20
America, Africa, Asia, up to 100g. €.14.00 up to 250g. €.18.00
28
Australia,N.Zeland,Oceania,up to100 g.€.15.00 up to 250g.€.19.00
35

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