Chrome Chalcedony beautiful rough slab specimen, Large 5" x 4 ", polished on one side, super rare rock found only in Australia (rs9482)


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$45.00 $75.00
SKU: rs39
Availability: 1 in stock

Chrome Chalcedony specimen

This material is a silicified rock only found on top of the ground in Australia, the main cause for being extremely rare. The chalcedony is a beautiful mottled emerald green with inclusions. The matrix also takes on the chrome chalcedony color. I've been told that this material can also be faceted.  Sometimes  pitting can be seen in the light colored matrix. 

Chrome chalcedony has been found in a number of places in Western Australia, this came from near the town of Newman which is approximately 700 miles north of the capital, Perth. I've been told that this is the last location that it was found in.

The geological setting of the area is that of an ultramafic intrusion into granite-greenstone of Archaean age. The intrusion consists of serpentinite that has also produced chrysoprase, chalcedony & common opal. These rock types along with the chrome chalcedony occur in the weathered, silicified cap rock. It's believed that original weathered serpentinite has been replaced through processes of silica deposition and the chrome chalcedony represents a whole-rock replacement or pseudomorph.

Chromium which is responsible for the green colouration of the chalcedony has originated from the existence of chromite within the serpentinite.
The last picture shows areas of the beautiful translucent green even with this 10 mm thick piece.  Exceptional grade of rare, extremely hard to find material.  Cut it for cabs or display it as a specimen.  
The extreme rarity is because it's found on the surface not under ground.  The Australians say it's also to expensive to locate because it's remote and there isn't any water in the area that it's found at.

Approx size: 5 x 4", 10 mm thick, weight: 10.8 ounces.

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