What is partly crystalline; -- said of rock which consists of crystals imbedded in a glassy ground mass called?
hypocrystalline — Partly crystalline; -- said of rock which consists of crystals imbedded in a glassy ground mass. (Webster's 1913.)
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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