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soapstone

A monoclinic mineral, (Ca/2,Na)0.3(Mg,Fe)3(Si,Al)4O10(OH)2.4H2O ; smectite group; soft; massive; plastic; unctuous; in veins and cavities in serpentinite and basalt. Etymol: Greek "sapon" soap

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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