Dab tsi ntawm pob zeb yog granite

Granite yog magmatic los yog igneous pob zeb. Raws li lub hauv paus chiv keeb, pob zeb tuaj yeem muab faib ua peb hom: pob zeb igneous, pob zeb sedimentary thiab metamorphic pob zeb. Granite yog pob zeb igneous (magmatic pob zeb), limestone yog pob zeb sedimentary, thiab marble yog pob zeb metamorphic.

Granite is an intrusive rock in acidic (SiO2>66 feem pua) magmatic pob zeb. Medium-coarse-grained, nplua-grained qauv, loj qauv. Kuj tseem muaj qee cov qauv variegated, cov qauv kheej kheej, thiab cov qauv zoo li gneiss.

Cov zaub mov tseem ceeb yog quartz, potassium feldspar thiab acid plagioclase, thiab cov zaub mov me yog biotite, amphibole, thiab qee zaum me me ntawm pyroxene. Muaj ntau ntau yam khoom siv minerals, cov khoom siv yog magnetite, sphene, zircon, apatite, tourmaline, fluorite thiab lwm yam. Cov ntsiab lus ntawm quartz yog feem ntau ntawm ntau yam magmatic pob zeb, thiab nws cov ntsiab lus tuaj yeem nyob ntawm 20-50 feem pua, thiab ob peb tuaj yeem ncav cuag 50-60 feem pua. Cov ntsiab lus ntawm cov poov tshuaj feldspar feem ntau yog ntau dua li ntawm plagioclase, thiab cov ntsiab lus piv ntawm ob feem ntau yog cov poov tshuaj feldspar nyiaj rau ob feem peb ntawm tag nrho cov feldspar, plagioclase nyiaj rau ib feem peb, thiab cov poov tshuaj feldspar muaj ntau nyob rau hauv granite. . Nws yog lub teeb liab fleshy, thiab kuj muaj greyish dawb thiab grey. Cov tawm-dawb kaleidite thiab plagioclase feem ntau indistinguishable ntawm tes qauv. Nyob rau lub sijhawm no, peb yuav tsum ua tib zoo saib xyuas cov yam ntxwv ntxaib ntawm ob lub feldspars, vim tias plagioclase muaj polycrystalline ntxaib crystals. Nws yog ib daim card-hom ob chav siv lead ua, uas qhia ob halves ntawm qhov sib txawv brightness.