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Colored Stones 19
Opal
6
Geology
Post-Graduate
08/28/2018
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Term
Background Color
 Definition
an opal's bodycolor, independent of its play-of-color
Term
Boulder Opal
 Definition
thin layers of precious opal, cut to include matrix
Term
Crazing
 Definition
the network of tiny fractures that develops with an opal loses moisture
Term
Matrix
 Definition
a gem material's host rock, which sometimes becomes part of the finished gem
Term
Potch Opal
 Definition
opal that lacks play-of-color
Term
Slocum Stone
 Definition
an opal imitation made of glass that appeared in the late 1970s
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