Chalcedony is a mixture of cryptocrystalline quartz and another silicon mineral called moganite. Chalcedony is usually divided into translucent varieties such as (blue) chalcedony, carnelian, chrysoprase, or banded varieties under the name agate, as well as opaque varieties known as jasper.
|Transparency:||Translucent to opaque|
All grit sizes
Usually not faceted, but if so, it is polished like regular crystalline quartz
|Olson:||Tin or cerium oxide on felt|
|Christiansen:||Aluminum, tin, or cerium oxide on felt, leather, or wood|
|Cox:||Cerium oxide on felt or leather|
|Covington:||Cerium oxide on felt or leather|
According to shape and color
Due to its fibrous or granular structure, chalcedony can be easily dyed.
LightningLap with cerium oxide is excellent for polishing large facets.
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