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Chalcedony

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ESM813247

Chalcedony

Description Tabs

Description
Locality: 
Rio Grande do Sul, Brazil
Class: 
Massive/Crystalline
Size Range: 
Museum (18cm plus)
Size: 
19 × 17.5 × 5 cm
Description

A geode with a polished quartz rim lined with botryoidal chalcedony aggregates

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