Forsterite Mg2SiO4
Txheem:
Yuav cov pob zeb ntuj hauv peb lub khw
mineral forsterite
Nws yog cov magnesium-nplua nuj kawg tivthaiv ntawm olivine khoom tov series. Nws yog isomorphic rau hlau-nplua nuj davhlau ya nyob twg fayalite crystallized nyob rau hauv orthorhombic daim ntawv.
Peb yeej ib txwm ntseeg hais tias forsterite yog txuam nrog igneous thiab metamorphic pob zeb. Peb pom nws hauv meteorites ib yam nkaus. Nyob rau hauv 2005, nws kuj tau pom nyob rau hauv cometary plua plav rov qab los ntawm Stardust sojntsuam. Hauv xyoo 2011, nws tau pom zoo li cov pob zeb me me hauv cov huab cua plua plav nyob ib ncig ntawm lub hnub qub uas tshwm sim.
Muaj ob polymorphs ntawm lub pob zeb no. Wadsleyite, rhombic, zoo li ringwoodite, isometric. Ob qho tib si tuaj los ntawm meteorites.
Ib tug ntshiab crystal yog magnesium, nrog rau oxygen thiab silicon. Cov tshuaj formula Mg2SiO4. Forsterite, fayalite Fe2SiO4 thiab tephroite Mn2SiO4 yog cov tswv cuab kawg ntawm cov tshuaj olivine series. Lwm cov ntsiab lus xws li Ni thiab Ca hloov Fe thiab Mg hauv olivines. Tab sis tsuas yog nyob rau hauv me me proportions nyob rau hauv ntuj phenomena.
Lwm yam minerals xws li monticellite CaMgSiO4. Ib qho txawv txawv ntxhia nplua nuj hauv calcium muaj cov qauv ntawm olivine. Tab sis muaj me me ntawm cov tshuaj tov ntawm olivine thiab lwm yam minerals. Peb tuaj yeem pom monticellite nyob rau hauv kev sib cuag nrog hloov pauv dolomites.
Forsterite muaj pes tsawg leeg: Mg2SiO4
Cov tshuaj muaj pes tsawg leeg feem ntau yog anion SiO44- thiab cation Mg2 + hauv molar piv ntawm 1: 2. Silicon yog lub hauv paus atom ntawm SiO44-anion. Ib daim ntawv cog lus sib txuas txuas txhua lub atom oxygen rau silicon. Plaub oxygen atom yog ib feem tsis zoo them.
Vim yog covalent daim ntawv cog lus nrog silicon. Yog li ntawd, cov pa oxygen atoms yuav tsum nyob deb. Yuav kom txo tau lub zog ntawm repulsion ntawm lawv. Qhov zoo tshaj plaws geometry kom txo tau cov repulsion yog cov duab tetrahedral.
Qhov no tau piav qhia thawj zaug hauv 1824 rau rooj plaub ntawm lub roob. Somma, Vesuvius, Ltalis. Nws lub npe los ntawm lus Askiv naturalist thiab ntxhia sau Adolarius Jacob Forster.
Lub pob zeb tam sim no tau raug tshawb xyuas raws li qhov muaj peev xwm biomaterial rau kev cog qoob loo. Vim zoo heev mechanical zog.
Gemological khoom
- Qeb: mesosilicate
- Cov roj formula: magnesium silicate (Mg2SiO4)
- Pob zeb diamond siv lead ua system
- Crystal chav kawm: dipyramidal
- Xim: tsis muaj xim, ntsuab, daj, daj-ntsuab, dawb;
- Cov duab ntawm cov muaju: dipyramidal prisms, feem ntau tabular, feem ntau granular los yog compact, loj heev.
- Kev sib koom tes ob leeg: {100}, {011} thiab {012}
- Neckline: zoo meej rau {010} tsis zoo rau {100}
- Kev puas tsuaj: conchoidal
- Mohs hardness: 7
- Luster: vitreous
- Stripe: dawb
- Transparency: pob tshab rau translucent
- Specification Gravity: 3.21 – 3.33
- Optical zog: biaxial (+)
- Refractive index: nα = 1.636 – 1.730 nβ = 1.650 – 1.739 nγ = 1.669 – 1.772
- Qhov sib txawv: δ = 0.033–0.042
- Lub kaum sab xis 2B: 82 °
- Melting point: 1890 ° C
forsterite lub ntsiab lus thiab cov khoom siv tshuaj, cov txiaj ntsig metaphysical
Cov ntu hauv qab no yog pseudo-scientific thiab raws li kev ntseeg ntawm kab lis kev cai.
Cov siv lead ua muaj lub ntsiab lus thiab kho cov khoom ntawm cov qhov txhab yav dhau los. Nws yog ib lub pob zeb uas muaj zog kho tau zoo. Qhov no yuav txo tau qhov mob uas nyob rau yav dhau los. Nws kuj muab lub zog rau koj saib mus rau yav tom ntej.
FAQ
Dab tsi yog cov ntawv thov rau forsterite?
Raws li gemstones rau kev lag luam siv raws li refractory xuab zeb thiab abrasives, magnesium ore thiab raws li cov ntxhia qauv. Lub Crystal yog lub npe hu ua German naturalist Johann Forster. Nws yog ib qho ntawm ob yam khoom siv tsuas yog hu ua olivine. Qhov thib ob ntxhia yog fayalite.
Qhov txawv ntawm fayalite yog dab tsi?
Fayalite yog pob zeb nplua nuj hlau nrog cov mis ntshiab Fe2SiO4. Forsterite yog cov khoom muaj magnesium nplua nuj nrog cov mis ntshiab ntawm Mg2SiO4. Txwv tsis pub, lawv nyuaj rau kev paub qhov txawv, thiab yuav luag txhua qhov qauv ntawm ob cov zaub mov no muaj cov hlau thiab magnesium.
Qhov twg yog forsterite mined?
Lub pob zeb feem ntau pom muaj nyob hauv dunites, gabbras, diabases, basalts thiab trachytes. Cov me me ntawm fayalite muaj nyob rau hauv ntau pob zeb volcanic qhov twg sodium yog ntau tshaj li poov tshuaj. Cov minerals no kuj pom muaj nyob rau hauv dolomic limestones, marbles, thiab hlau-nplua nuj metamorphoses.
Yuav ua li cas xam cov ntsiab lus olivine hauv forsterite?
Cov ntsiab lus ntawm olivine-forsterite cov ntsiab lus (Fo = 100 * Mg / (tag nrho Mg + Fe), proportions ntawm cations) piv rau tus nqi ntawm Ca cations (mineral formula raws li plaub lub atoms oxygen).
Sau ntawv cia Ncua