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hardness plates
A series of small pieces of minerals of differing hardness, polished flat, and set side by side in cement, for testing hardness of another mineral, which is drawn across one piece after another, beginning with the hardest, until it scratches one.
- 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)