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Quartz With Chalcedony

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PDM1166322

Description Tabs

Description
Locality: 
Barros Cassal, Rio Grande do Sul, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.9 × 3.3 × 0.7 cm
Weight: 
17.00gr
Description

Tabular specimen with numerous concentric aggregates of chalcedony agate, cemented by transparent quartz crystals. Some areas show some green fluorescence under short ultraviolet light. According to Paulo Neves, these are formed when soil concretions, derived from rhyodacites, are strongly silicified.

Acquired in 1970 in Arnhem by Wilfred Moorer (1945-2015). Ex Wilfred Moorer #1467.

Combine specimens to reduce shipping costs!.

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

Current price

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10
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Start 12 Feb 18:00
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Shipping Information

Postage Area Price
Belgium (Tracked)
7
NL, DE, FR, LU (Tracked)
10
EUROPE 1 . or 2 (Tracked)
11.12
CANADA (Tracked)
14
USA (NOT Tracked) . or USA (Tracked)
14
REST (Tracked)
14

Seller Information

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