| (Na,Ca)(Si,Al)4O8
Oligoclase is a silicate with composition (Na,Ca)(Si,Al)4O8. This 12.6 carat gem is of variety "sunstone" and is from Bjordam Farm, Telemark, Norway. The sample is on display at the Smithsonian Museum of Natural History.
oligoclase 是一种含钠和钙的硅酸盐,化学式为 (Na,Ca)(Si,Al) 4 O 8 。这颗重12.6克拉的宝石属于“太阳石”品种,产自挪威特勒马克地区的 Bjordam Farm。该样品陈列于史密森尼国家自然历史博物馆。
Mindat describes oligoclase as a variety of albite, or a plagioclase feldspar with and albite.
Mindat将 oligoclase 描述为 albite 的一种变种,或是一种含 albite 的斜长石。
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