Difference between revisions of "Agate"

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Named for the ''Achates'' river in Sicily, '''agate''' is a variety of microcrystalline quartz. Most specimens exhibit alternating bands of light and dark colors. When the bands are wide enough, solid color stones can also be present. There are dozens of agate varieties on the market. The following is a list of the better known types in [[ancient]] and [[medieval]] times:
 
Named for the ''Achates'' river in Sicily, '''agate''' is a variety of microcrystalline quartz. Most specimens exhibit alternating bands of light and dark colors. When the bands are wide enough, solid color stones can also be present. There are dozens of agate varieties on the market. The following is a list of the better known types in [[ancient]] and [[medieval]] times:
  
*cornelian & sard (also known as carnelian, a variety of chalcedony ranging from pale orange to ''heat-treated'' the stone turns blood red; ''sard'' is the reddish brown variety)
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*cornelian & sard (also known as variety of chalcedony ranging from pale orange to scarlet, when ''heat-treated'' the stone turns blood red; ''sard'' is the reddish brown variety)
 
*chrysoprase (an apple green chalcedony; see also the entry on [[emerald]]s)
 
*chrysoprase (an apple green chalcedony; see also the entry on [[emerald]]s)
 
*dendrite or "moss agate" (milky white mottled with olive green)
 
*dendrite or "moss agate" (milky white mottled with olive green)

Revision as of 03:18, 7 May 2006