Sentence Examples

  • It is certain, however, that most obsidians are very acid or rhyolitic. The dark, semiopaque glassy forms of the basic igneous rocks are known as tachylytes.
  • Frankincense, or olibanum, occurs in commerce in semiopaque, round, ovate or oblong tears or irregular lumps, which are covered externally with a white dust, the result of their friction against one another.

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