Quartz

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Quartz is one of the most abundant minerals on earth and has been used as a gemstone for as long as mankind can remember. It occurs in many forms and colors but is colorless when pure which makes it an allochromatic gemstone. In order to shed some light on the different varieties the quartz group is usually divided into two: the monocrystalline varieties and the polycrystalline varieties. To find out more about a specific member of the quartz group click on its name or image:

Monocrystalline Quartz Polycrystalline Quartz
Amethyst.jpg

Amethyst

Agate.jpg

Agate

Ametrine.jpg

Ametrine

Carnelian.jpg

Carnelian

Citrine2.jpg

Citrine

Chrysoprase.jpg

Chrysoprase

Rock Crystal.jpg

Rock Crystal

Jasper.jpg

Jasper

Smokey.jpg

Smoky Quartz

Onyx.jpg

Onyx

Rose3.jpg

Rose Quartz

Great Cameo of France.jpg

Sardonyx

Prasiolite Bloodstone4.jpg

Bloodstone

Aventurine Tigereye.jpg

Tiger's-Eye


Gemological information for Quartz
Color All colors
Crystal Structure Trigonal
Refractive Index 1.544-1.553
Durability Very durable
Hardness 7
Treatments May be irradiated and heat treated, depending on variety
Country of origin Worldwide deposits
Quartz care
Ultrasonic cleaning Usually safe
Steam cleaning Usually safe
Warm soapy water Safe
Chemical attack Avoid
Light sensitivity May fade
Heat sensitivity May change color

Online G&G articles on quartz

Lang Antiques
Lang Antiques