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  • Oligoclase - Wikipedia
    Oligoclase occurs, often accompanying orthoclase, as a constituent of plutonic igneous rocks such as granite, syenite, and diorite It occurs in porphyry and diabase dikes and sills as well as in the volcanic rocks andesite and trachyte, and in mugearite where its presence is a defining feature
  • Oligoclase: Mineral information, data and localities.
    A plagioclase feldspar with an albite : anorthite molar ratio ranging from 90 : 10 to 70 : 30 Originally described from Danvikstull, Stockholm, Södermanland, Sweden Visit gemdat org for gemological information about Oligoclase
  • Oligoclase Mineral Data
    Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern Euhedral Crystals - Occurs as well-formed crystals showing good external form Granular - Generally occurs as anhedral to subhedral crystals in matrix Fluorescent, Long UV=yellow
  • Oligoclase feldspar: The mineral Oligoclase information and pictures
    Oligoclase belongs to the Plagioclase Feldspar group, an isomorphous solid solution series Albite is one member, containing sodium and no calcium The other end member, Anorthite, contains calcium and no sodium Oligoclase is an intermediary member of this series
  • Oligoclase - Details and Facts - allmineralsrock
    Oligoclase is a common mineral found in many igneous and metamorphic rocks It is a member of the plagioclase feldspar group, which also includes albite and anorthite Oligoclase is a white to pale-yellow mineral with a hardness of 6-6 5 on the Mohs scale
  • Oligoclase | mineral | Britannica
    feldspar, any of a group of aluminosilicate minerals that contain calcium, sodium, or potassium Feldspars make up more than half of Earth’s crust, and professional literature about them constitutes a large percentage of the literature of mineralogy
  • Oligoclase (Feldspar) - National Gem Lab
    Oligoclase is found as colorless to pale yellow or pale green, and rarely blue, crystals in only a few locations around the world Colorless, transparent crystals have been found at the Hawk Mine, Bakersville, North Carolina and occasionally faceted as gems
  • Oligoclase - Gems Minerals
    Oligoclase is a sodium-calcium plagioclase feldspar mineral belonging to the continuous solid-solution series between albite and anorthite It is a common rock-forming mineral found in igneous, metamorphic, and some sedimentary environments
  • Oligoclase Archives - Cochise College Geology
    Oligoclase ranges from 90% to 70% NaAlSi3O8 and 70% to 50%CaAl2Si2O8 Color: White, gray, reddish, greenish, yellowish, brown, colorless Sometimes displays schiller, a bluish or multi-colored opalescence Transparency: Transparent to translucent Streak: Uncolored | Luster: Vitreous, pearly | Tenacity: Brittle
  • C:\MdpWEB\O\Oligoclase. PDF - Handbook of Mineralogy
    Mineral Group: Feldspar group, plagioclase series Occurrence: Common in granite, syenite, nepheline syenite, and their pegmatites; in diorite, rhyolite, andesite In serpentinite and gneiss; in amphibolite facies metamorphic rocks; as clastic grains in sedimentary rocks Association: Quartz, orthoclase, sanidine, tourmaline, corundum





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