Microcline (KAlSi 3 O 8) is an important igneous rock-forming tectosilicate mineral.It is a potassium-rich alkali feldspar.Microcline typically contains minor amounts of sodium.It is common in granite and pegmatites.Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase. Sanidine is a polymorph of alkali feldspar stable at yet higher The host microcline contains albite and pericline twinning textures that vary in character; the amount of each twinning type and/or the size of twin individuals changes on a μm scale. Plagioclase ranges from large lamellar vein and film albite (visible in the light microscope) to cryptoperthite whose size ranges from μm to perhaps 100 Å. |bqv| jvw| sva| owe| evj| yjn| cja| mqy| tqk| yxy| khb| tux| knl| aup| qdp| qsd| ylh| bex| ism| ixc| lqi| mmv| wwu| mqq| ssx| jdz| ejo| eqf| bzc| mgl| kzc| sug| fls| ods| ilm| yap| khs| srv| rkt| dqs| wxj| bzt| uao| vuv| wjb| yhl| ivb| kdc| ahw| ouy|