potassium feldspar
Common ignite rock component
Potassium feldspar is a group of aluminum silicate minerals containing potassium, among the most abundant rock-forming minerals in Earth's crust.
The main varieties—orthoclase, microcline, and sanidine—appear in granite and other igneous rocks, giving them pink or white coloration.
Potassium feldspar is used in ceramics, glassmaking, and as a mild abrasive.
Iridescent feldspar gemstone
- amazoniteGreen microcline variety
- sunstoneReflective inclusion-bearing feldspar
- cabochonDomed, unfaceted gemstone
- schillerInternal mineral reflectance
ornamental · polished · specimen · collector · lapidary
Oxygen-bound crystal compound
- igneousFormed from cooled magma
- metamorphicUndergoing structural change
- sedimentaryFormed from deposited material
- graniteIgneous rock, quartz-rich
Forming identical pairs
- cleavageTendency to split cleanly
- prismaticLight-dispersing, multicolored
- habitSettled regular tendency
- lamellarConsisting of thin layers
lattice · luster · vitreous · opaque · translucent · striations · intergrowth
Continuous change or flow
- glazeThin lustrous coating
- porcelainTranslucent fired clay
- stonewareDense ceramic fired hot
- earthenwareLow-temperature fired pottery
vitrification · firing · kiln · sintering · melting point · whiteware · tile
moonstone
Iridescent feldspar gemstone
- amazoniteGreen microcline variety
- sunstoneReflective inclusion-bearing feldspar
- cabochonDomed, unfaceted gemstone
schiller · ornamental · polished · specimen · collector · lapidary
silicate
Oxygen-bound crystal compound
- igneousFormed from cooled magma
- metamorphicUndergoing structural change
- sedimentaryFormed from deposited material
twinning
Forming identical pairs
- cleavageTendency to split cleanly
- prismaticLight-dispersing, multicolored
- habitSettled regular tendency
lamellar · lattice · luster · vitreous · opaque · translucent · striations · intergrowth
flux
Continuous change or flow
earthenware · vitrification · firing · kiln · sintering · melting point · whiteware · tile