noun-modifying (irregular)
crystalline
Technical term used in chemistry, materials science, and geology to describe a substance that has a crystal structure or the property of being crystalline. Often used prenominally (e.g., 結晶性の物質).
この鉱物は結晶性の構造を持っている。
This mineral has a crystalline structure.
結晶性ポリマーは非晶性ポリマーより硬
Crystalline polymers are harder than amorphous polymers.
非晶性 means 'amorphous' or 'non-crystalline', the opposite of 結晶性.
Compound of 結晶 (kesshō, 'crystal') + 性 (-sei, '-ity, -ness'), forming a technical adjective meaning 'crystalline'.