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Orbicular jasper : ウィキペディア英語版 | Orbicular jasper
Orbicular jasper is a variety of jasper which contains variably-colored ''orbs'' or spherical inclusions or zones. In highly silicified rhyolite or tuff, quartz and feldspar crystallize in radial aggregates of needle-like crystals which provide the basis or ''seed'' for the orbicular structure seen in this kind of jasper. The material is quite attractive when polished and is used as an ornamental stone or gemstone. Various local or commercial names have been used for the material, such as kinradite, oregonite, owyhee jasper, ocean jasper and poppy-patterned jasper, depending on the source. ''Poppy-patterned jasper'' or ''poppy jasper'' is the varietal name for material from Morgan Hill, Santa Clara County, California. The trade name ''ocean jasper'' is used for a variety found along the intertidal shores of northeast Madagascar. In Nebraska orbicular jasper is found in altered rhyolite beds noted for a variety of jaspers and related agates. ==Gallery==
File:Poppyjasper.jpg|Unpolished poppy jasper, Morgan Hill File:Jaspe orbiculaire Madagascar 1597.jpg|Madagascar orbicular jasper (detail)
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Orbicular jasper」の詳細全文を読む
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