Quartz
Quartz (SiO2) is the most common mineral on the planet and can be found in large quantities at the earths crust. He has a wide variety of colors.
Quartz is the mineral defining the value of 7 on the Mohs scale of hardness, a qualitative scratch method for determining the hardness of a material to abrasion. His name originates from the German “Quarz”.
Some types of Quartz.
| Amethyst | Purple to violet colored quartz |
| Citrine | Yellow quartz ranging to reddish orange or brown (Madera quartz), and occasionally greenish yellow |
| Smoky quartz | Light to dark gray, sometimes with a brownish hue |
| Prasiolite | Mint Green |
| Rock Crystal | Transparent |
| Rose Quartz | Pink, may display diasterism |
| Milky Quartz | White, may display diasterism |
| Aventurine | Quartz with tiny aligned inclusions (usually mica) that shimmer with aventurescence |
He is used in the manufacture of watches, clockwork machines as well as in electrical timing circuits.
Its semi-precious forms are used in decoration and jewelry. Rock crystal is used to make optical devices in the form of quartz sand during the glass making process.
Agate, Tiger eye and Opal belong to the quartz family.
