Green Chrome Chalcedony preformed rough slab, 38 x 55 x 5.5 mm (r8692)
Chrome Chalcedony rough slab
Origin: Newman, Australia
Material: a green silicified rock only found on top of the ground in Australia. That's the main cause for it being rare.
Characteristics: a beautiful mottled emerald green with inclusions. The matrix also takes on the chrome color. Some pitting in the light colored area on the back. Chromium which is responsible for the green colouration of the chalcedony has originated from the existence of chromite within the serpentinite. it's preformed to make it easier to cab or finish as a specimen.
Approx size: 38 x 55 x 5.5 mm, Weight: 19.7 g.
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.
Miners in Australia say it's to expensive to locate because of the remote locations found in and the lack of water at these locations.
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First 2 pictures taken wet to bring out colors you may see after polishing. Remaining pictures taken dry to show imperfections if any. If it's transparent one picture is taken with backlighting.
I use a full spectrum 45 w light bulb - photography photo CFL 5500K. It is a daylight balanced pure white light.
Unless noted all my rough slabs are preformed and the front and backs sanded with 320 diamond grit.
An 18mm US dime or 24mm US quarter and 10 mm squares in my pictures should help with image sizing.
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