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Goethite Quartz & Chalcedony

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PJM75302

Goethite Quartz & Chalcedony

Ex J & S Mommers Collection

Description Tabs

Description
Locality: 
Agate Creek, Queensland, Australia
Size Range: 
Small miniature (3-4.5 cm)
Size: 
2.2 × 3.2 × 2.3 cm
Description

Lusterous, sharp black needles of goethite spray up between hundreds of doubly terminated quartz crystals, dominating this specimen is what appears to be a japan law twinned quartz that has been completely encapsulated with a secondary quartz overgrowth. Included in many of the quartz crystals are small white balls of  banded chalcedony

Acquired as a quartz/chalcedony nodule at the Loxton gemboree in 1986 and subsequently trimmed.

Mineral Data
What's on the rock

Goethite

Formula: 
α-Fe3+O(OH)
Strunz: 
4.00.
Crystal System: 
Orthorhombic
Hardness: 
5.0 - 5.5
Type Locality: 
Hollertszug Mine (Hollerter Zug Mine), Dermbach, Herdorf, Siegerland, Rhineland-Palatinate, Germany

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
Earthstones Australia

Seller Information

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