The Kieselguhr reference article from the English Wikipedia on 24-Apr-2004
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Kieselguhr

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Diatomite, tripolite, novaculite, novaculit' or kieselguhr refers to mineral deposits of fossiled diatom. According to http://www.mindat.org/ Tripolite is not classified as a mineral.

It is also found in Tripoli, Libya.

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