Chrome Chalcedony rough slab., 5 1/4" x 3 "x 3/8", cabs or specimen, (rs42191)
Chrome Chalcedony specimen
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.
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.
Approx size: 5 1/4" x 3" x 10 mm, weight: 6.6 ounces.
The first picture show the beautiful green translucence, taken with a backlight. The second picture shows the polished front, the third picture is the back which is smooth but unfinished it was taken wet to bring out the colors.
I use a 24 mm coin and 10 mm squares in my pictures to help with image sizing.
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