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The lustre is usually of the common vitreous type, though in some opals
it may be greasy, resinous, or waxy. The lustre of natural specimens is
only moderately strong, it is increased by cutting and polishing, but
even then is in no way remarkable. Both common and precious varieties of
opal are, as a rule, cloudy, being at the best only translucent or
semi-transparent. In a pure condition the mineral is perfectly
colourless, the tint of the coloured varieties is due to the presence of
impurities. In colour these varieties are usually brown, yellow, or
red, of various shades. Green opal is rare, black opal is known, and the
cloudy varieties of milk opal are white.
Their physical properties vary considerably. Precious Opal is
conspicuous amongst all others for the magnificent play of colours
produced by the refraction and reflection of light in its colourless
substance. common opal, and Fire Opal, yellow-red Precious Opal
Opal is divided into three subgroups:
The name is derived from an Indian (Sanskrit) word for "stone". Opal
consists of silica and water. The amount of water varies in different
specimens.
Stone - Blue Opal
Shape - Mix Shape
Size - Mix Size
Quality - 1st
Lot Weight - 313.00 Gms
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