5 ESSENTIAL ELEMENTS FOR CRYSTAL

Calcite crystals in many cases are used in optical products, and even the graphite in pencil lead are sheets of crystals that primarily break apart layer by layer to write down. Silica can type silicate crystals which happen to be the basis for quartz, mica, olivine, and many other crystals and minerals.杂质、裂纹越少越好。质地好的水