Peb feem ntau hais tias granite "yeej yuav tsis ploj mus". Tab sis hauv lub sijhawm ntev, granite pob zeb tseem yuav fade, nws yog ib pliag xwb. Cov tsos ntawm cov tsev tshwj xeeb, cov duab plaub fab, thiab lwm yam tseem yuav cuam tshuam los ntawm kev cuam tshuam ntawm cua thiab hnub. Piv txwv, liab granite yuav ploj mus tom qab kaum hnub thiab ib nrab lub hlis ntawm raug tshav.
Cov tshuaj ntxhia pob zeb hauv ocher granite tsuas yog tsim los ntawm feldspar, quartz, mica, pyroxene, thiab amphibole. Hauv cov qauv silicate loj, txhua lub silicon ion puag ncig plaub ions oxygen, ua rau silicon-oxygen tetrahedron. Tus txheej txheem txheej txheem no muaj cov khoom tsim nyog thiab ruaj khov, muaj zog acid thiab alkali tsis kam, nyuaj rau yaj, huab cua tiv taus, thiab ua tau zoo heev tsis kam.
Kev cais tawm ntawm granite tseem txawv raws li hom pob zeb. Feem ntau hais lus, tsaus nti thiab lighter-xim granite yog yooj yim ploj, vim hais tias cov ntxhia muaj pes tsawg leeg tsaus xim (xws li dub, tsaus ntsuab) granite feem ntau yog pyroxene, amphibole, yooj yim plagioclase, magnetite, thiab lwm yam. Lub teeb xim granites feem ntau yog kua qaub plagioclase, potash feldspar, biotite, thiab quartz. Cov ntxhia hauv cov av muaj feem ntau tsim nyob hauv av, qee qhov tsim ua ntej, thiab qee yam tsim tom qab.
Thawj qhov feem ntau yog los ntawm cov ntsiab lus hnyav uas tsis muaj lub cev atomic weight, txoj haujlwm tob dua, muaj cov pa oxygen tsawg dua, thiab muaj zog siab dua; qhov tom kawg yog rov qab. Yog li no, cov khoom siv roj ntsha sib txawv feem ntau muaj cov sijhawm sib txawv tsim, tom qab kev ntxhib ntxoo: cov ntxhia ntxhia cov nqi: olivine-pyroxene, amphibole, biotite; lub teeb xim-cov xim ntxhia ua kom yooj yim: theem pib plagioclase-acid plagioclase-potash feldspar -quartz. Tom qab thawj zaug tsim muaj cov ntxhia tau raug rau saum npoo, vim kev hloov pauv ib puag ncig, kev hloov pauv thib ob yog qhov yuav tshwm sim, thaum lub sijhawm lig tsis hloov, thiab feem ntau ruaj khov yog quartz.
Lwm qhov mob yog tias theem nrab cov pob zeb hauv av ceev yog ntau dua li cov ntxhia theem qis. Piv txwv li, ntsuab thiab ntsuab-ntsuab kho kom zoo nkauj ntoo nrog chlorite thiab chlorite yog cov khoom tseem ceeb tau ploj mus tom qab 5 txog 10 xyoo ntawm kev paub, tab sis piv nrog marble. Qhov kev hloov pauv no tseem muaj peev xwm heev. Kev hloov xim (fading) tseem cuam tshuam nrog ib puag ncig. Yog tias cov kua qaub thiab alkali ntsiab lus nyob hauv huab cua hauv thaj chaw thaj chaw muaj qhov siab, nws yooj yim los hloov cov fading. Qib ntawm kev txij nkawm kuj tseem ceeb heev.
Marble yog tsuas yog tsim ntawm calcite, dolomite thiab lwm yam pob zeb hauv av. Cov tshuaj formula calcite yog CaCO3, thiab dolomite yog CaMg [CO3] 2. Ob leeg muaj carbonate [CO3] ions, uas ntau dua thiab yooj yim cuam tshuam nrog cov nyhuv ntawm sulfur dioxide hauv huab cua. Tej feem. Calcite yog yooj yim rau cov tshuaj tiv thaiv nrog dej. Cov calcium bicarbonate (Ca [HCO3] 2), uas yog yaj hauv dej, yuav dhau los ua calcium carbonate tom qab cov dej poob lawm. Tom qab cov kev hloov pauv no, lub qub crystal-polished nto ntawm marble polished phaj tsis muaj lawm. Yog li, nws tsis haum rau siv marble rau sab nrauv phab ntsa tiav, tshwj xeeb tshaj yog rau cov ntaub ntawv kho kom zoo nkauj nraum zoov. Raws li cov pob zeb ci ntawm cov phab ntsa sab nrauv, xim yuav hloov feem ntau tom qab 2 txog 3 xyoos.