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  • K-feldspar - University of North Dakota
    The three principle varieties of K-feldspar are microcline (low temperature), orthoclase (medium temperature), sanidine (high temperature) Other, rare, related feldspar varieties include adularia and anorthoclase
  • ALEX STREKEISEN-Alkalifeldspar-
    This diagram shows how feldspar minerals are classified on the basis of their chemical composition The sequence of minerals along the base of the triangle represents the solid solution series of plagioclase between albite and anorthite
  • Tectosilicates - GeoClassroom
    Sanidine, Microcline and Plagioclase have characteristic twinning which helps distinguish them Sanidine typically shows the Carlsbad Twin law: Microcline shows a characteristic cross hatched twinning that results from the Al-Si ordering upon cooling
  • Feldspar - Wikipedia
    Solid solutions between albite and anorthite are called plagioclase, [14] or, more properly, plagioclase feldspar Only limited solid solution occurs between K-feldspar and anorthite, and in the two other solid solutions, immiscibility occurs at temperatures common in the crust of the Earth
  • Distinguishing the Feldspars - Steve Dutch
    Albite (0-10% anorthite) is found mostly in very Na-rich environments It forms from more anorthite-rich plagioclase by ion-exchange with sea water, and as an authigenic mineral in marine sedimentary rocks
  • Feldspar Minerals | Types, Structure and Role in Earths Crust
    In felsic volcanic rocks, sanidine is typical because rapid cooling preserves the high-temperature state; in slowly cooled granites, microcline dominates due to Al–Si ordering, and perthitic intergrowths record subsolidus unmixing
  • Alkali feldspars | Springer Nature Link
    High-temperature polymorphs such as high sanidine and high albite have disordered structures, whereas, lower-temperature phases, such as microcline and low albite, are well ordered It is convenient to arrange alkali feldspars into series in which each member of the series, no matter what its composition, has the same structural state
  • 6. 4. 3: Feldspars - Geosciences LibreTexts
    Sanidine forms in high temperature rocks; orthoclase and microcline form in lower temperature rocks (Figure 6 42) Sanidine commonly crystallizes from silicic lava but may change into orthoclase and, perhaps, microcline if the lava cools relatively slowly
  • The Feldspar Compositional Ternary Diagram - Chemostratigraphy. com
    At high temperatures (≥ 1000 °C), a solid solution exists between NaAlSi 3 O 8 and KAlSi 3 O 8 Nevertheless, a change in the symmetry between triclinic anorthoclase (Ab100 to Ab63) and monoclinic sanidine (Ab63 to Ab0) occurs
  • Day 17 - Auburn University
    For example, sanidite-high albite solid solutions exist at high temperature, but given time during cooling, the mixture will exsolve to form an interlocking network of low-albite and microcline Ñ 'perthite' Ñ at low temperature





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