Physican Features
1. Color- Colorless.
2. Streak- White.
3. Luster-Vitreous.
4. Cleavage-None.
5. Transparency- Transparent.
6. Fracture- Conchoidal.
7. Hardness- 7.
8. Forms- Prismatic.
9. Crystal system- Trigonal/Hexagonal.
Rock crystal is the colorless variety of quartz. Rock crystals crystalize directly from magma (lava), in pegmatites, and in low temperatures. This is the purest variety of quartz. The crystals can grow to enormous sizes in pegmatites. They also form inside geodes, as crystalline, and microcrystalline quartz. Quartz is a silicon dioxide and is the third most common mineral in the earths crust. This makes quartz an important and essential component of acidic igneous rock's and can be found just about anywhere.
