Chalcedony Facts - JewelInfo4u

 

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 Chalcedony Facts
 Author: , 11/29/2004 7:25:10 PM
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Chalcedony  Physical Properties 

Chemical Composition

The chemical composition is Silicon dioxide and the chemical formula is SiO2.

Colours

Varied colours.

Hardness

Varies between 6.5 – 7 Mohs.

Refractive Index

1.543  - 1.554

Specific Gravity

2.65 – 2.67

Luster

Waxy to dull.

Solid State

Opaque to translucent. Few varieties can be transparent too.

Crystal System

Tetrahedral crystal system.

Cleavage

None

Heat Sensitive

No

Fractures

Conchoidal

Bi-refringence

0.009 

Pleochroism

None

Source

Worldwide occurrence. Main producers are United States and Brazil.

Enhancement

Not enhanced.

Precautions

Only general gemstone precautions required.

NOTE – These properties are largely for the Chalcedony as a group name. It is common to almost all the varieties. However, few exceptions would always be present.

 



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JewelInfo4u - Chalcedony Facts