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Chalcedony Psm Calcite

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AST514585

Chalcedony Psm Calcite

Pseudomorph

Description Tabs

Description
Locality: 
Serifos Island, Milos, South Aegean, Greece
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.5 × 5 × 3.5 cm
Description

Very fine specimen of gray to dark gray botryoidal chalcedony on volcanic rock matrix.What makes specimen most interesting is pseudomorph of chalcedony after group of scalenoedral calcite crystals seen on specimen. Most unusual for the locality and in excellent condition.

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

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