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Sanidine is the high
temperature form of pot****ium
feldspar with a
general formula K(AlSi3O8).
Sanidine is
found most
typically in
felsic volcanic rocks...
- fine-grained groundm****. The
mineral ****emblage is
predominantly quartz,
sanidine, and plagioclase. It is the
extrusive equivalent of granite. Its high silica...
-
sanidine (anorthoclase) and is
often cryptoperthitic, with
alternating microscopic bands of
sodium feldspar (albite) and pot****ium
feldspar (
sanidine)...
- by barium. The
first of
these include:
orthoclase (monoclinic) KAlSi3O8
sanidine (monoclinic) (K,Na)AlSi3O8
microcline (triclinic) KAlSi3O8 anorthoclase...
- pot****ium- and titanium-rich richterite; low
aluminium diopside; and iron-rich
sanidine. A
variety of rare
trace minerals occur. The
rocks are high in pot****ium...
-
called perthite. The higher-temperature
polymorph of KAlSi3O8 is
sanidine.
Sanidine is
common in
rapidly cooled volcanic rocks such as
obsidian and felsic...
-
Rainbow (var.)
Orthoclase Unakite Plagioclase Albite Labradorite Oligoclase Sanidine Sunstone Oregon sunstone Rainbow lattice sunstone Fergusonite Ferroaxinite...
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albite –
sanidine alkali feldspar solid solution series.
Intermediate members of this series, high albite,
anorthoclase and high
sodium sanidine are stable...
-
minerals found in the
pumice clasts are biotite, plagioclase, quartz, and
sanidine. The main
composition is SiO2 (73.4-77.9%),
followed by Al2O3 (12.7%)....
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chemically the same as orthoclase, but with a
different crystalline structure Sanidine, the high-temperature form of pot****ium
feldspar (K,Na)(Si,Al)4O8 Adularia...
