• Oligoclase - Wikipedia

    en.wikipedia.org/wiki/Oligoclase Oligoclase is a rock-forming mineral belonging to the plagioclase feldspars. In chemical composition and in its crystallographic and physical characters it is intermediate between albite (Na Al Si 3 O 8) and anorthite (CaAl 2 Si 2 O 8). The albite:anorthite molar ratio ranges from 90:10 to 70:30.
  • Oligoclase feldspar: The mineral Oligoclase information ...

    www.minerals.net/mineral/oligoclase.aspx 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 is considered by some authorities as a variety of Albite rather than a separate mineral.
  • Oligoclase: Mineral information, data and localities.

    www.mindat.org/min-2976.html A variety of Oligoclase with Anorthite:Albite between 80:20 and 90:10. Now regarded as a superflous subdivision of Oligoclase. [Clark, 1993 - "Hey's Mineral Index"] Originally described from Dypingdal Serpentine-magnesite deposit, Snarum, Modum, Buskerud...
  • Oligoclase Mineral Data

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  • Oligoclase - definition of oligoclase by The Free Dictionary

    www.thefreedictionary.com/oligoclase Define oligoclase. oligoclase synonyms, oligoclase pronunciation, oligoclase translation, English dictionary definition of oligoclase. n. A white, gray, green or red variety of plagioclase feldspar that contains a higher proportion of sodium than calcium and is common in silica-rich igneous...
  • Oligoclase | Definition of Oligoclase at Dictionary.com

    www.dictionary.com/browse/oligoclase Oligoclase definition, a kind of plagioclase feldspar occurring commonly in white crystals, sometimes shaded with gray, green, or red. See more.
  • Oligoclase | Definition of Oligoclase by Merriam-Webster

    www.merriam-webster.com/dictionary/oligoclase Oligoclase definition is - a mineral of the plagioclase series. History and Etymology for oligoclase. German Oligoklas, from olig-olig- + Greek klasis breaking, from klan to break — more at clast
  • Oligoclase | Gem5.com

    gem5.com/stone/79/oligoclase Oligoclase is a mineral of the plagioclase feldspar series, other members of which are Labradorite and Anorthite. It forms as tabular crystals, which are commonly twinned, with parallel or criss-cross twinning striations. It appears as massive, granular...
  • OLIGOCLASE (Sodium Calcium Aluminum Silicate)

    www.galleries.com/Oligoclase Oligoclase is a member of the Plagioclase Feldspar Group. The plagioclase series comprises minerals that range in chemical composition from pure NaAlSi3 O8, Albite to pure CaAl2 Si2 O8 , anorthite. Oligoclase by definition must contain 90-70% sodium to 10-30% calcium in the sodium/calcium position of the crystal structure.
  • Buy Natural Loose Oligoclase Gemstones at AJS Gems

    www.ajsgem.com/oligoclase-2046340480.html Oligoclase belongs to the plagioclase feldspar family of minerals, which includes sunstone and labradorite. Transparent specimens of oligoclase are rare. Sometimes this material is incorrectly described as transparent amazonite. Oligoclase has a hardness of 6-6.5 on the Mohs scale.