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Quartz Var Chalcedony

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PDM587736

Quartz Var Chalcedony

Description Tabs

Description
Locality: 
Texas, United States of America
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.3 × 3.7 × 1.4 cm
Description

White botryoidal chalcedony covering a very porous volcanic rock. The external layer has a red coating, but the body of the chalcedony is white. The specimen is from the Gabriel Fauvart (BE) collection, and the given locality is central Texas (USA). Acquired in 1979.

Mineral Data
What's on the rock

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
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

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