Quick and as described
|Dimensions (mm)||not provided|
|Weight (carats)||not provided|
TIFFANY OPAL ROUGH
SHADES OF PURPLE COLOUR
PICTURE TAKEN WET TO SHOW HOW IT WILL FINISH AFTER POLISH
Weight: 49.4 CTS APPROX.
SIZE: 33 X 22 X 9 MM APPROX
This is a parcel of natural untreated rough specimens of opal flourite from Utah Usa.This material comes from a beryllium mine and it is becoming hard to mine in quantity.Tiffany Stone is composed of various minerals such as bertrandite , beryl, calcite, chalcedony, cobalt, dolomite, fluorite, manganese oxide, rhodonite, quartz, zinc and white opal potch. The purple color that characterizes Tiffany Stone was created by fluorine gases, while the stricking black-colored veins were caused by manganese oxide; all of which were sealed within the sedimentary layers, becoming opalized over time. Tiffany Stone does not display any opalescence or colour play that is common in AUSTRLISN OPAL. This material will flourense a bright GREEN under short wave ultra violet light.It is best to use a mask when cutting this material.As far as i can find out the name is not registered but it seems to have been accepted in the trade as the "Tiffany stone'
|Starts||22nd Dec 2013 9:23pm PST|
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