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单词 Brittle mica
释义

Brittle mica

英语百科

Mica

Mica sheet
Mica flakes
Dark Mica from Eastern Ontario

The mica group of sheet silicate (phyllosilicate) minerals includes several closely related materials having nearly perfect basal cleavage. All are monoclinic, with a tendency towards pseudohexagonal crystals, and are similar in chemical composition. The nearly perfect cleavage, which is the most prominent characteristic of mica, is explained by the hexagonal sheet-like arrangement of its atoms.

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