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Pitchstone (Geology Dictionary)

Pitchstone : A black, opaque volcanic glass that may contain irregular, whitish clusters of minerals. Resembles pitch in appearance.

_ ស្វែងរកឬបកប្រែពាក្យផ្សេងទៀតនៅប្រអប់នេះ៖
ឯកសារការងារនិងរៀនគ្រប់ប្រភេទ៖​
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