Quartz

It is a composition of SiO2, which suffers from a great white color and an expanded variety of its varieties of Oxides and Silicon. Its varieties are:

1. Pink Quartz
2. Amethyst
3. Citrine
4. Sapphire Quartz
5. Smoked Quartz
6. Rock Crystal
7. Green Quartz
8. Tiger's Eye
9. Cat Eye
10. Hawk Eye
11. Aventurine
12. Quartz Lemon - Yellow

• The chemical and physical properties of the varieties named are the same as quartz.
• All have a Hardness of 7.
• All varieties named are Oxides
• All are soluble in HF (hydrofluoric acid)
• All minerals are Hexagonal
• There is a variety of Smoked Quartz, which is called Morion