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Precious Opal Psm Calcite Psm Ikaite

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CLB584622

Precious Opal Psm Calcite Psm Ikaite

Pseudomorph

Description Tabs

Description
Locality: 
White Cliffs, Yungnulgra County, New South Wales, Australia
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.4 × 2.5 × 2 cm
Description

Very rare double pseudomorph: precious opal has replaced calcite that replaced ikaite before. Part of the extremely rare and famous opal 'pineapples', only known from this locality.

Mineral Data
What's on the rock

Precious Opal

Variety Of: 

Opal

Formula: 
SiO2·nH2O
Strunz: 
4.DA.10
Hardness: 
5.5 - 6.5
Formula: 
SiO2·nH2O
Hardness: 
5.5 - 6.5
Streak: 
white

Calcite

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

Ikaite

Formula: 
CaCO3·6H2O
Strunz: 
5.CB.25
Crystal System: 
Monoclinic
Hardness: 
0.0
Type Locality: 
Ikka Bund, Ikka Fjord (Ìka), Sermersooq, Greenland

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