Webster's Online Dictionary
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Specialty Definition: HEMICRYSTALLINE

DomainDefinition
ChemistrySaid of the texture of a porphyritic igneous rock in which crystals and glassy groundmass are equal or nearly equal in volumetric proportions, the ratio of phenocrysts to groundmass being between 5:3 and 3:5. Source: European Union. (references)
MiningSee: hyalocrystalline. (references)

Source: compiled by the editor from various references; see credits.

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