完かん晶しょう質しつ

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Meanings

1

noun which may take the genitive case particle 'no', noun

holocrystalline

Technical term in geology and petrology describing a rock texture composed entirely of crystals, with no glassy groundmass.

perfect, completion, end

晶sparkle, clear, crystal

質substance, quality, matter

半はん晶しょう質しつ
半晶質 (hypocrystalline) refers to a rock texture with both crystals and glass, whereas 完晶質 is fully crystalline.
ガラス質しつ
ガラス質 (glassy) is the opposite texture, lacking crystals; 完晶質 is entirely crystalline.

Compound of 完 (complete) + 晶 (crystal) + 質 (quality/texture), literally 'fully crystalline texture'. A modern scientific coinage.