Orthoclase [ KAlSi3O8 ]

Images of Orthoclase

Material properties

Formula KAlSi3O8
Abbreviation Or
IMA Status Approved (IMA 1962 s.p.)
Classification K feldspar
Related materials Microcline
Luminescence emitters AlO4, Al-O- -Al, Exsolution features, Fe, Mn, Pb, Si-O, Triplet-singlet
Reflectance line Si-O
Spectra Luminescence (1)
Search other databases webmineral.com, mindat.org, rruf.info, fluomin.org, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database
Tags Aluminosilicate, Mineral

Composition

Element Atoms
K 1
O 8
Al 1
Si 3
Total: 13

References for Orthoclase

Reference
Lines Spectra Images
Götze 2000c 2 1 1
Laukamp et al. 2021 2 0 0
Rendell & Clarke 1997 1 0 0
Tarashchan 1978 6 0 0

Specimens of Orthoclase

Name Owner Materials Phase purity Image Spectra Techniques
M1284 Orthoclase CSIRO Albite (var. Ca), Microcline, Muscovite-2M1, Orthoclase (86.9%), Quartz 86.9 0 —
M2253 Covellite CSIRO Chalcanthite, Chalcopyrite, Covellite, Muscovite-1M, Muscovite-2M1, Orthoclase (16.0%), Quartz 16.0 0 —
APIH13 Halloysite CSIRO Albite, Halloysite, Halloysite (var. hkl), Illite-Smectite 12.0A, Kaolinite, Montmorillonite, Orthoclase (7.9%), Quartz 7.9 0 —
M0762 Goethite CSIRO Goethite, Kaolinite, Muscovite-1M, Muscovite-2M1, Orthoclase (7.1%), Quartz 7.1 0 —
MES124 Hambergite CSIRO Albite, Ankerite, Cookeite, Hambergite (var. F), Microcline, Orthoclase (7.0%), Quartz 7.0 0 —
M1296 Petalite CSIRO Albite (var. Ca), Microcline, Muscovite-2M1, Orthoclase (5.8%), Petalite, Quartz 5.8 1 Reflectance
NR-62 Orthoclase CSIRO Albite, Microcline, Orthoclase (5.0%), Quartz 5.0 0 —
MT8367 Lithiophilite CSIRO Fluorapatite, Orthoclase (4.0%), Potassic-ferro-richterite, Quartz, Triploidite 4.0 0 —
Swy-2 Montmorillonite CSIRO Montmorillonite, Orthoclase (3.5%), Quartz 3.5 0 —
M2101 Pollucite CSIRO Orthoclase (3.0%), Pollucite, Quartz 3.0 1 Reflectance
MES123 Pollucite CSIRO Orthoclase (3.0%), Pollucite, Quartz 3.0 1 Reflectance
Swy-1 Montmorillonite CSIRO Montmorillonite, Orthoclase (2.8%), Quartz 2.8 0 —
MES200 Quartz CSIRO Dolomite, Labradorite, Microcline, Orthoclase (2.0%), Quartz 2.0 0 —
MES201 Quartz CSIRO Albite (var. Ca), Aragonite, Calcite, Microcline, Orthoclase (2.0%), Quartz 2.0 0 —
46E3372 Andradite CSIRO Albite, Albite (var. Ca), Fluorapatite, Grossular, Orthoclase (1.8%), Quartz, Titanite 1.8 0 —
MES119 Rhönite CSIRO Anorthoclase, Armalcolite, Augite, Hematite, Labradorite, Orthoclase (1.8%) 1.8 0 —