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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
  • 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
  • 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
  • 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
  • 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
  • Search - 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 - 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
  • Feldspars - all about the plagioclases and K-feldspars
    Overview of physical properties, chemistry, structure, occurence and mineralogy of feldspar Description of major members like anorthite, albite, plagioclase, orthoclase, sanicine and microcline
  • Alkali Feldspar – Geology is the Way
    Volcanic rocks, cooling rapidly from high temperatures, retain the sanidine structure On the other hand, microcline can be found only in plutonic rocks that cooled down very slowly
  • Polymorphism of feldspars above 10 GPa - Nature
    Herein, we report on the discovery of new high-pressure polymorphs of anorthite, albite and microcline at pressures above 10 GPa





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