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 most abundant mineral crystals and can take [...]
Citrine is a variety of a quartz stone which is usually yellowish to brownish in color. Jewelers find use for this type of quartz as a gem setting on a ring or necklace. Citrine happens to be the most valuable quartz gemstone. How it is formed Under natural conditions, citrine is colored yellow to orange [...]
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 Black quartz is called onyx Brown quartz is called smokey quartz [...]
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