Gauin, gauinite los yog gauinite - tectosilicate ntxhia nrog sulfate - video

Gauine, gauinite lossis gauinite yog sulfate tectosilicate ntxhia nrog Na3Ca (Si3Al3) O12 (SO4) tip qauv.

Yuav cov pob zeb ntuj hauv peb lub khw

Tej zaum yuav mus txog 5 wt. K2O, zoo li H2O thiab Cl. Nws yog ib tug feldspar thiab ib tug tswv cuab ntawm pawg sodalite. Lub pob zeb tau piav qhia thawj zaug hauv xyoo 1807 raws li cov qauv pom nyob hauv Vesuvian lava ntawm Monte Somma, Ltalis, thiab tau muaj npe nyob rau xyoo 1807 los ntawm Brunn-Neergard tom qab Fabkis crystallographer René Just Gahuy (1743–1822). Qee zaum siv los ua lub pov haum.

tsos

Nws crystallizes nyob rau hauv lub isometric system, tsim tsawg dodecahedral los yog pseudooctahedral muaju mus txog 3 cm nyob rau hauv lub cheeb; kuj tshwm sim raws li rounded nplej. Crystals yog pob tshab rau translucent, nrog rau vitreous rau oily luster. Cov xim feem ntau yog lub teeb xiav, tab sis tuaj yeem yog dawb, grey, daj, ntsuab, thiab paj yeeb. Nyob rau hauv nyias seem, cov muaju yog xim tsis muaj xim los yog daj ntseg xiav, thiab cov streak yog daj ntseg heev rau dawb.

Cov khoom

Lub pob zeb yog isotropic. Muaj tseeb isotropic minerals tsis muaj birefringence, tab sis lub pob zeb yog weakly birefringent nyob rau hauv lub xub ntiag ntawm inclusions nyob rau hauv nws. Lub refractive index yog 1.50. Txawm hais tias nws yog qhov tsawg heev, zoo li cov iav qhov rais zoo tib yam, nws yog tus nqi siab tshaj plaws rau cov zaub mov los ntawm pawg sodalite. Nws tuaj yeem pom cov xim liab-txiv kab ntxwv rau mauve fluorescence nyob rau hauv qhov ntev wavelength ultraviolet lub teeb.

Lub neckline tsis zoo tagnrho, thiab ntxaib yog kev sib cuag, nkag mus thiab polysynthetic. Cov pob txha tawg tsis zoo rau lub plhaub-puab, cov ntxhia yog nkig thiab muaj zog ntawm 5 1/2 txog 6, yuav luag nyuaj li feldspar. Txhua tus tswv cuab ntawm pawg sodalite muaj qhov ntom ntom ntom, tsawg dua li ntawm quartz; hauyne yog qhov ntom tshaj plaws ntawm txhua qhov, tab sis muaj qhov tshwj xeeb lub ntiajteb txawj nqus ntawm tsuas yog 2.44-2.50.

Yog tias lub pob zeb tau muab tso rau ntawm lub iav swb thiab kho nrog nitric acid HNO3, ces cov tshuaj tau tso cai rau maj mam evaporate, monoclinic gypsum koob tau tsim. Qhov no distinguishes hauine los ntawm sodalite, uas nyob rau hauv tib yam kev mob tsim cubic muaju ntawm chlorite. Cov ntxhia tsis muaj hluav taws xob.

Sample los ntawm Mogok, Burma

Kev muag khoom ntuj gemstones hauv peb lub khw