by Joy | Jul 17, 2009 | Crystals Gemstones Jewelry
Quartz is the most common mineral on the face of the Earth. Chemically, quartz is a compound called silicon dioxide, SiO2. As a crystal, quartz is used as a semiprecious gemstone. Quartz is a relatively hard stone, 7 on the Mohs hardness scale. Quartz is one of the...
by Joy | Mar 3, 2009 | Precious And Semi Precious Stones
Quartz is the second most abundant mineral in the earth’s crust. Pure quartz is colorless, but also occurs in many different colors, from clear to opaque A few examples of the many different kinds: Purple quartz is called amethyst Yellow quartz is called citrine...
