Quartz Mineral Information

Learn about this fascinating mineral.


Lemon quartz is a versatile gemstone - used in both silver and gold jewelry.
Mineral: Quartz
Composition: SiO2
Crystal: Hexagonal
Specific Gravity: 2.6
Color: Lemon Yellow
Origins: Brazil (most common)
Hardness: 7
Treatment: Gamma Ray

What is quartz?

Quartz is a mineral. It grows in a hexagonal crystal shape, and is found in igneous, metamorphic and sedimentary rock. The lemon color is most likely caused by Iron (Fe) breaching the color centers of the stone. The oxidation of the iron can give it the yellow or orange color. Iron otherwise can give the stone a purple color (called amethyst). You can find quartz when walking on the beach, or near a river.


Quartz comes from all over the world with some of the most famous sources for the gemmy quartz including Brazil and Africa. Most of the world supply of lemon quartz comes from Brazil. Quartz is literally everywhere though -- sandy beaches and in rocks. It's even in meteorites. Quartz is transported on the earth through the molten layer underneath the earth's surface. It can then be re-deposited to the surface via volcanic or tectonic activity.

Lemon quartz is mined in Brazil. Large crystals can be found. The quartz crystal system (silicon dioxide) is abundant in Brazil, and throughout most of the world. It is a relative of amethyst (which is a purple quartz).


Lemon quartz is treated by gamma radiation. Most people -- even gemologists and jewelers -- don't know this fact. The gamma radiation is harmless, and there is no need for a cooling period (like there is with different types of radiation). This type of radiation is what they use to sterilize foods. The gamma rays form color centers within the crystal. It is a permanent treatment.

Next - learn about the faceting

The cut of a gemstone is important, so click here to go to the lemon quartz cutting guide.

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