Maksud opal | Babel Free
Takrif
A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula SiO₂·nH₂O.
Tahap CEFR
B1
Pertengahan
Perkataan ini sebahagian daripada perbendaharaan kata CEFR B1 — tahap pertengahan.
Perkataan ini sebahagian daripada perbendaharaan kata CEFR B1 — tahap pertengahan.
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