THE SMART TRICK OF CRYSTAL THAT NO ONE IS DISCUSSING

Calcite crystals are often Utilized in optical gear, and also the graphite in pencil direct are sheets of crystals that primarily crack aside layer by layer to put in writing. Silica can variety silicate crystals which happen to be the basis for quartz, mica, olivine, and a number of other crystals and minerals.杂质、裂纹越少越好。质地�