NOT KNOWN FACTUAL STATEMENTS ABOUT CRYSTAL

Calcite crystals will often be Employed in optical tools, and perhaps the graphite in pencil guide are sheets of crystals that effectively split apart layer by layer to write. Silica can sort silicate crystals that are the basis for quartz, mica, olivine, and many other crystals and minerals.水晶原石观赏石充分体现了天然水晶的本质