Definition of subcrystalline in English:
subcrystalline
adjective ˌsʌbˈkrɪstəlʌɪnˌsʌbˈkrɪst(ə)lʌɪn
Geology Chiefly of rocks and other natural materials: imperfectly or incompletely crystalline; semi-crystalline.
Origin
Early 19th century; earliest use found in Curtis's Botanical Magazine. From sub- + crystalline.