Glittering Stones >> Semi Precious Stones >> Chalcedony

Semi Precious Stone Chalcedony

Chalcedony is defined as a fibrous cryptocrystalline form of silica and composing a variety of mineral Quartz and moganite with a trigonal crystal structure. The chalcedony mineral has waxy luster and it may be semitransparent or translucent.

The varieties of chalcedony are agate, carnelian, chrysoprase, heliotrope and moss agate. The structure of Chalcedony was cryptocrystalline quartz and also composes of monoclinic polymorph of quartz called moganite. The Mohs scale hardness for the mineral is 6 to 7.5 with waxy luster. It is a more soluble mineral compared to quartz under low temperature condition, despite of its two mineral chemical identical. Wide range of colors are available in Chalcedony, but commonly seen colors are white to gray, grayish blue or shades of brown ranging from pale to nearby black.

Chalcedony
Historical Facts of Chalcedony
Refractive Index 1.530 - 1.539
Chemical Composition SiO2
Hardness 6 - 7
Density 2.59 - 2.61
Crystal Group Hexagonal
Crystal system Trigonal
Luster Waxy, Vitreous, Dull, Greasy, Silky
Other names Chalcedon, Calcedonia, Calcédoine
Varieties Agate, Carnelian, Chrysoprase, Heliotrope, Moss agate
Color White, Gray, Grayish blue, Brown, Pale black, Green, Blue, Lavender
Ocurrence Brazil, Afghanistan, U.SA. Germany, India, Uruguay, Austarlia, Egypt, Italy, Scotland, South Africa, Namibia, Madagascar

Gem Chalcedony Jewelry
Chalcedony Bracelet
Chalcedony Bracelet
Chalcedony Earrings
Chalcedony Earrings
Chalcedony Necklace
Chalcedony Necklace
Chalcedony Rings
Chalcedony Ring

 

   
 
 
 
 
 
 
 
 

Glittering stones  |   About Us  |   Contact Us  |   Resources  |   Precious stones  |   Semi precious stones  |   Gems Glossary  |   Gallery  |   Types of Gems  |   History of Gems  |   Birthstones  |   Anniversary Gemstone Gifts  |   Stones Properties  |   Gem Jewelry  |   Gems Library  |   Gemstones Uses  |   Precious & Semiprecious Stones Facts  |   Diamond Shapes  |   Zodiac Birthstones  |   Gemstone Articles  |   Articles  |   News  |   Sitemap


San Francisco Bus Tours   |   Fsc Certified Printing   |   Business Class Airline Tickets   |   stop foreclosure   |   Adult halloween costumes