Biotite vs. Muscovite: Yuav ua li cas kom paub qhov txawv ntawm lawv los ntawm xim thiab cov khoom
Koj tuaj yeem qhia tau yooj yimbiotitethiabmuscoviteSib nrug los ntawm lawv cov xim.Muscovite zoo nkaus li lub teeb, pob tshab, thiab silvery-dawb, qee zaum nrog coppery sheen.Biotite yog xim dub lossis kub xim av.
Ob leeg yog mica minerals tab sis saib txawv heev: biotite yog tsaus, thaum muscovite yog ci thiab ci.
Cov ntsiab lus tseem ceeb
Biotite yog xim av lossis dub; muscovite yog lub teeb, meej, los yog silvery. Xim yog thawj qhov tseeb.
Muscovite feem ntau yog pob tshab; biotite blocks feem ntau lub teeb. Transparency pab kom paub qhov txawv ntawm lawv.
Ob leeg yog ci, tab sis muscovite zoo li ci dua thiab glittery dua vim nws cov xim sib dua.
Txoj cai ntawm tus ntiv tes xoo: tsaus=biotite (blocks teeb); lub teeb=muscovite (hloov lub teeb).
Biotite vs. Muscovite: Xim thiab yam ntxwv
Xim txawv
Xim yog qhov sib txawv tshaj plaws.
Biotite: feem ntau yog xim av lossis xim dub
Muscovite: tsis muaj xim, daj ntseg, lossis kub, feem ntau nrog nyiaj lossis kub reflections
Ib sab ntawm sab, biotite yog pom tias tsaus dua. Ob daim ntawv nyias, cov ntawv tiaj tus, tab sis xim ib leeg tso cai rau kev txheeb xyuas ceev.
| Cov ntxhia | Xim | Crystal Form |
|---|---|---|
| Biotite | Tsaus xim av / dub | Daim ntawv zoo li |
| Muscovite | Tsis muaj xim / lub teeb / silvery | Daim ntawv zoo li |
Transparency thiab luster
Muscovite: pob tshab lossis ze li pob tshab; koj tuaj yeem pom los ntawm cov flakes nyias.
Biotite: me ntsis translucent los yog opaque; blocks feem ntau lub teeb.
Ob leeg muaj ibvitreous (iav)luster, tab sis muscovite zoo li ci dua vim nws yog sib dua thiab pom tseeb.
Cov yam ntxwv tseem ceeb
Xim: biotite=tsaus; muscovite=teeb
Pob tshab: muscovite=ntshiab; biotite=opaque / semi-opaque
Luster: ob qho tib si glassy, muscovite ci dua
Crystal cwj pwm: ob qho tib si nyias, cov ntawv tiaj tus (ib txwm ntawm micas)
| Cov ntxhia | Cleavage | Hardness | Luster | Xim | Cwj pwm |
|---|---|---|---|---|---|
| Muscovite | Zoo meej nyob rau hauv ib qho kev taw qhia | 2.76–2.88 | Vitreous | Colorless rau golden | Cov ntawv nyias / nplai |
| Biotite | Zoo meej nyob rau hauv ib qho kev taw qhia | 2.7–3.4 | Vitreous | Tsaus xim av rau dub | Cov ntawv nyias / nplai |
Biotite: Xim thiab Khoom
Xim yam ntxwv
Biotite tau yooj yim lees paub los ntawm nws cov xim tsaus:
Tsaus ntsuab
Xim av
Dub
Brownish ntsuab
Liab xim av
Nyob rau hauv lub teeb polarized, nws yuav pom sib dua tints.Nws cov xim tsaus los ntawmhlau thiab magnesium; cov ntsiab lus hlau ntau dua ua rau nws tsaus.
Lwm yam khoom ntawm Biotite
Hardness2.5-3 ntawm Mohs nplai; scratchable nrog ib tug tooj liab npib, tsis yog ib tug ntiv tes.
Cleavage: zoo meej basal cleavage, splits rau nyias, tiaj flakes.
Luster: pearly rau vitreous.
Pob tshab: opaque rau translucent.
Biotite feem ntau pom muaj nyob rau hauv cov pob zeb tsis zoo thiab metamorphic xws li granite.
Muscovite: Xim thiab Khoom
Xim yam ntxwv
Muscovite yog ntau sib dua li biotite, feem ntau:
Nyiaj dawb
Pleev ntsuab
Lub teeb xim av
Nws yog heev reflective thiab zoo li ci thiab glittery nyob rau hauv tshav ntuj.
Lwm yam khoom ntawm Muscovite
Cleavage: zoo meej cleavage rau hauv nyias, hloov tau cov nplooj ntawv.
Hardness: 2–2.5; heev mos, scratchable nrog ib tug ntiv tes.
Tshwj xeeb lub ntiajteb txawj nqus: 2.8–3.0; sib dua li qhov xav tau.
Luster: vitreous mus pearly.
Streak: dawb.
Muscovite feem ntau tsim nyob rau hauv nyias flakes los yog tuab "phau ntawv" ntawm stacked nplooj ntawv.
Kev sib piv ntawm lub cev: Vim li cas lawv saib txawv
Xim Chemistry
Lawv cov xim los ntawm cov tshuaj sib txawv.
| Cov ntxhia | Tshuaj Formula | Xim ua rau |
|---|---|---|
| Biotite | K(Fe,Mg)₃(AlSi₃)O₁₀(OH)₂ | Tsaus los ntawm hlau & magnesium |
| Muscovite | KAl₂(AlSi₃)O₁₀(OH)₂ | Lub teeb, silvery los ntawm high aluminium, tsawg hlau |
Transparency thiab luster
Muscovite yog ntau pob tshab.
Ob leeg yog glassy, tab sis muscovite zoo li ci ntsa iab thiab ci ntsa iab.
Ob leeg muajzoo meej cleavagenyob rau hauv ib qho kev taw qhia.
Muscovite yog softer (ntiv tes khawb tau); biotite xav tau ib npib tooj liab.
Field Identification Tips
Txheeb xyuas Biotite hauv Teb
Nrhiavxim av los yog dubflakes.
Nyias, ci, hloov tau cov nplooj ntawv.
Feem ntau opaque; me me kom tsis muaj teeb pom kev.
Muaj nyob rau hauv granite thiab metamorphic pob zeb.
Nyuaj tshaj muscovite.
Txheeb xyuas Muscovite hauv Teb
Nrhiavsilvery, daj ntseg ntsuab, los yog lub teeb xim avflakes.
Pob tshab; koj tuaj yeem pom ntawm daim nyias nyias.
Heev mos, yooj yim peelable rau hauv cov nplooj ntawv hloov tau.
Bright, glittery luster nyob rau hauv tshav ntuj.
Tej zaum yuav pom cov qauv cuam tshuam zoo li lub hnub qub.
Cov txiaj ntsig pom qhov ntsuas:
Perfect basal cleavage
Tsawg nyem
Tsis muaj zog pleochroism
Bright, tshiab tsos
Feem ntau yuam kev kom zam
Tsis txhob cia siab tsuas yog luster - ob qho tib si ci ntsa iab.
Nco ntsoov xyuasxim THIAB pob tshab.
Cov av los yog huab cua tuaj yeem ua rau muscovite tsaus; ntxuav qhov chaw ua ntej.
Tsuas yog micas tiag tiag tev tau yooj yim rau hauv cov ntawv nyias.
Cov lus nug nquag
Dab tsi yog qhov txawv ntawm biotite thiab muscovite?
Biotite yog xim av lossis dub; muscovite yog pob tshab, nyiaj, los yog xim xim.
Puas tuaj yeem pom biotite thiab muscovite hauv tib lub pob zeb?
Yog - lawv feem ntau tshwm sim ua ke hauv granite.
Vim li cas muscovite pob tshab los yog silvery?
Nws cov qauv tshuaj tso cai rau lub teeb kom dhau mus, muab qhov pom tseeb, silvery tsos.
Nws puas muaj kev nyab xeeb los tuav biotite thiab muscovite?
Yog, tab sis tuav maj mam vim lawv flake yooj yim. Ib txwm ntxuav koj txhais tes tom qab.
Mica pawg yog dab tsi?
Cov pab pawg mica suav nrog cov zaub mov uas sib cais ua nyias, cov nplooj ntawv tiaj tus. Biotite thiab muscovite yog ob hom ntau tshaj plaws.