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Siderite On Chalcedony

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PCZ615643

Siderite On Chalcedony

Description Tabs

Description
Locality: 
Penlee Quarry, Cornwall, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8.5 × 7 × 5.5 cm
Description

Lght to dark brown (almost black) siderite crystals partially covering yellow stalagtites of chalcedony. An interesting and damage free specimen from Cornwall.

Mineral Data
What's on the rock

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

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
Peter Crozier Minerals