Mikroklin






















































Mikroklin
Feldspar(Microcline)USGOV.jpg
Mikroklin feltspat
Generelt
Kategori
Tektosilikat
Zeolite
Kjemisk formel KAlSi3O8
Identifikasjon
Farge fargelaus
Krystallform Det kan vere allotriomorf eller idiomorf. Korna er vanlegvis lange med tavleforma utsjånad. Kan ha lamellar som er danna av utløyst albitt.
Krystallsystem Triklinsk
Tvilling Typisk albitt og periklin. Skapar eit gittermønster.
Kløyv Perfekt på {001} og god på {010}.
Optiske eigenskapar
Optiske eigenskapar
Toaksa negativ
Brytingsindeks nα = 1.514 - 1.529 nβ = 1.518 - 1.533 nγ = 1.521 - 1.539
Dobbeltbryting Opp til første ordens kvit (grovt 0.007)
2V-vinkel 65–88°

Mikroklin er eit mineral og den vanlegaste feltspaten i granittar og pegmatittar. Det er eit viktig råstoff for framstilling av porselen. Mikroklin er den trikline modifikasjon av kalifeltspat KAlSi3O8. Det vert danna ved lågare temperaturar enn ortoklas.



Kjelder |


  • Mikroklin. (2009, 29. mars). I Store norske leksikon. Henta 14. februar 2014 frå http://snl.no/mikroklin.








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