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Quartz

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PJM41290

Quartz

Description Tabs

Description
Locality: 
Prospect Quarry, Prospect, Cumberland County, New South Wales, Australia
Size Range: 
Cabinet (10-18 cm)
Size: 
4.3 × 10.2 × 5.7 cm
Description

A very unusual beasty that came with a small collection of Propect Quarry specimens that I acquired from a retired quarryman in Sydney.

This specimen is not defined by the mineral, which is quartz but rather by what is not there. This specimen is a mass of hollow casts most likely of laumontite. This has left a very interesting boxwork of angled rectangular cavities that comprised the bulk of this specimen.

There are some rather crude heulandite crystals adhering to one side of this specimen

Mineral Data
What's on the rock

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White
Earthstones Australia

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