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Chalcedony Psm Calcite

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BSM102230

Chalcedony Psm Calcite

ex Philadelphia Academy of Natural Sciences #2415
With Antique Label

Description Tabs

Description
Locality: 
North Roskear, Camborne, Cornwall, United Kingdom
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 7.2 × 3.4 cm
Description

A layer of pyramidal quartz crystals with a dark red haematite included chalcedonic coating over which has developed masses of cream coloured rhombohedral crystals, formerly of calcite but now replaced by chalcedony.

There is a little bruising but nevertheless this is a very unusual and historic specimen dating from around 1850.

Mineral Data
What's on the rock

Chalcedony

Variety Of: 

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Hardness: 
7.0
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Kadıköy (Chalcedon), Istanbul Province, Marmara Region, Turkey

Calcite

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

Seller Information

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