Petalite varieties beside spodumene, tourmaline, and lepidolite. A member of the feldspathoid mineral relatives, petalite features a minimal thermal expansion level, rendering it a favorite player inside the glass and ceramics business. 5 on the Mohs scale, which makes it comparatively durable but not as tricky as Various other gemstones https://garyv814ptw2.blognody.com/profile