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15 Cards in this Set
- Front
- Back
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Diamond deposits found at the ocean’s shore are
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marine deposits.
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Indicator minerals in kimberlite and lamproite include tiny
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diamonds |
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For more than 2,000 years, the only known diamond sources were
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alluvial |
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Gravity sorting separates diamonds from
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lighter materials. |
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The concentration of diamonds within a pipe is called
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ore grade |
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Most of the diamonds mined today come from
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pipes |
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Only a small percentage of known diamond deposits are mined because most
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are not profitable.
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Diamonds classified as cuttable can be 100 times more valuable than
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industrial diamonds.
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The first step in exploring for diamonds is to
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look for the oldest parts of the earth’s crust |
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A profitable mine
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produces diamonds whose value is higher than the mine’s operating costs.
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Diamonds are more concentrated in
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marine deposits.
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A mine’s potential profitability depends in part on
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its ore grade.
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To focus their search for diamond deposits, geologists look for
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indicator minerals.
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Diamond rough suitable for use in tools, drills, and abrasives is
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industrial quality.
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Diamond rough suitable for use in jewelry is called
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cuttable |
