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  • 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
  • 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
  • Feldspar - ALEX STREKEISEN
    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
  • 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
  • Feldspar - Mineral Composition, Uses, Types | Britannica
    The most obvious differences between the high- and low-temperature diagrams are along the alkali-feldspar (Or-Ab) join (the boundary line between the phases) As indicated, sanidine and anorthoclase are high-temperature alkali feldspars, and perthite is their low-temperature analogue
  • 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
  • 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
  • Feldspars: Abundance, Structure, and Types - SlideServe
    K-feldspar • K-feldspar has three different structural states: K-feldspar formed at high temperature and cooled quickly is sanidine If formed at high temperature and cooled slowly (plutonic) or formed at moderate temperatures are orthoclase If formed at low temperature are microcline
  • 2 Quartz, Feldspars, and other Framework Silicates
    Orthoclase and microcline form in lower temperature and or slower cooled igneous and metamorphic rocks Just about all microcline forms by recrystallization of sanidine or orthoclase





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