首页 > Term: common opal
common opal
Opal without play of color. Most varieties are of no gemological interest or importance; others because of their color or markings are set in jewelry. Compare: precious opal
- 词性: noun
- 行业/领域: 采矿
- 类别 一般矿业; Mineral mining
- Government Agency: USBM
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创建者
- ed.young
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(Milwaukee, United States)