steatite
['sti:əˌtaɪt]
n.
块;
滑石;
皂石;
（绝缘用的）滑石石瓷;
例句:
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Steatite hardens when it is fired in a kiln.
来自BBC
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Most scarabs were made of steatite which was then covered with a turquoise coloured glaze.
大多数圣甲虫是用滑石做成,然后在滑石上用绿宝石彩釉覆盖.
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Steatite is a soft stone which can be carved using metal tools.
来自BBC