This defines 'silica' as a rock fragment of quartz, typically 4 to 64 millimeters in diameter, especially naturally rounded grains. It describes a specific geological material.
水晶石石英断片，直径4到64毫米（0。16到2。51英寸），尤指天然圆形的石英颗粒
| Expression | 水晶石石英断片，直径4到64毫米（0。16到2。51英寸），尤指天然圆形的石英颗粒 |
|---|---|
| Meaning | A rock fragment between4 and64 millimeters(0.16 and2.51 inches) in diameter, especially one that has been naturally rounded. |
| Reading | shuǐjīng shí shíyīng duàn piàn zhíjìng dào háomǐ dào yīngcùn yóuzhǐ tiānrán yuánxíng de shíyīng kēlì |
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