• 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 | mineral | Britannica

    www.britannica.com/science/oligoclase Oligoclase, the most common plagioclase, occurs in granite, diorite, and other felsic igneous rocks and in some metamorphic rocks; notable occurrences are at Aust-Agder, Norway, and Fine, New York, United States.Andesine, less common, occurs in many granular and volcanic rocks with intermediate silica content,…
  • 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 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 | 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 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 - NOVA Mineralogy

    blogs.nvcc.edu/mineralogy/minerals/oligoclase In thin section, plagioclase feldspar grains often look like they’re sprinkled with dirt (PPL) or tiny confetti (XPL). You can find the explanation on the plagioclase feldspar page. Physical Properties Chemical formula (Na,Ca)(Si,Al)4O8 Class Tectosilicate 3D framework of linked tetrahedra Crystal system Triclinic Habit Prismatic Tabular Elongate Columnar Grainy Massive from minerals.net ...
  • 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 Mineral Data

    www.webmineral.com/data/Oligoclase.shtml Oligoclase Crystallography: Axial Ratios: a:b:c =0.6377:1:0.6651 : Cell Dimensions: a = 8.15, b = 12.78, c = 8.5, Z = 5; alpha = 94.016°, beta = 116.3333°, gamma ...
  • Oligoclase: Mineral information, data and localities.

    www.mindat.org/min-2976.html [var: Oligoclase-Albite] Jingzhan Zhu, Guohui Zhang, Qingsong Du, and Jing He (2013): Northwestern Geology 46(4), 207-214 ⓘ West ore body [var: Oligoclase-Albite] The Editorial Committee of the Mineral deposits in China (eds) Mineral deposits of China, Vol. 3, 226-279. Ulanqab City (Wulanchabu Prefecture)