Microcline

It is a fully ordered triclinic modification of potassium feldspar and is dimorphous with orthoclase.Microcline is identical to orthoclase in many physical properties, and can be distinguished by x-ray or optical examination.When viewed under a polarizing microscope, microcline exhibits a minute multiple twinning which forms a grating-like structure that is unmistakable.The Spanish explorers who named it apparently confused it with another green mineral from that region.[4] The chemical compound name is potassium aluminium silicate, and it is known as E number reference E555.
Photomicrograph of thin section of microcline showing crosshatched crystal twinning (in cross polarized light)
Feldspar (amazonite)
TectosilicateFormulaIMA symbolSpace groupCrystal habitTwinningpericline twinningPhotomicrographthin sectioncrystal twinningpolarizedCleavageFractureTenacityMohs scaleLusterStreakDiaphaneitySpecific gravityRefractive indexBirefringencePleochroism2V angleigneous rockmineralpotassiumalkali feldsparsodiumgranitepegmatitesorthoclaseSanidinepolymorphmonoclinictriclinicE numberfeldspardimorphouspolarizing microscopePerthiteamazoniteAmazon BasinSpanishColoradoList of mineralsBibcode