Forsterite Mg2SiO4
Nā mea:
E kūʻai i nā pōhaku maoli ma kā mākou hale kūʻai
mineral forsterite
ʻO ia ka ʻāpana hope waiwai o ka magnesium o ka moʻo hoʻonā paʻa olivine. He isomorphic i ka hao-waiwai terminal fayalite crystallized ma orthorhombic form.
Ua manaʻoʻiʻo mākou ua pili ka forsterite me nā pōhaku igneous a metamorphic. Loaʻa iā mākou ma nā meteorites pū kekahi. I ka makahiki 2005, ua ʻike ʻia i loko o ka lepo cometary i hoʻihoʻi ʻia e ka Stardust probe. I ka makahiki 2011, ua ʻike ʻia ʻo ia he mau kristal liʻiliʻi i loko o nā ao kinoea lepo a puni kahi hōkū e puka mai ana.
ʻElua mau polymorph o kēia pōhaku. Wadsleyite, rhombic, like ringwoodite, isometric. Loaʻa nā mea ʻelua mai nā meteorites.
ʻO ka kristal maʻemaʻe ka magnesium, a me ka oxygen a me ke silika. Huina kimeka Mg2SiO4. ʻO Forsterite, fayalite Fe2SiO4 a me tephroite Mn2SiO4 nā lālā hope loa o ka moʻo olivine solution. ʻO nā mea ʻē aʻe e like me Ni a me Ca e hoʻololi iā Fe a me Mg i nā olivines. Akā ma nā ʻāpana liʻiliʻi wale nō i nā hanana kūlohelohe.
ʻO nā minela ʻē aʻe e like me ka monticellite CaMgSiO4. ʻO kahi mineral ʻokoʻa i waiwai i ka calcium ke ʻano o ka olivine. Akā he wahi liʻiliʻi o ka hopena paʻa ma waena o ka olivine a me kēia mau mineral ʻē aʻe. Hiki iā mākou ke ʻike i ka monticellite e pili ana me nā dolomite i hoʻololi ʻia.
Forsterite Composition: Mg2SiO4
ʻO ka hui kemika ka nui o ka anion SiO44- a me ka cation Mg2+ i loko o ka ratio molar o 1:2. ʻO ka silikoni ka ʻātoma waena o ka SiO44-anion. Hoʻopili ʻia kahi paʻa covalent hoʻokahi i kēlā me kēia ʻātoma oxygen i ke silika. ʻEhā mau ʻātoma oxygen i hoʻoili ʻole ʻia.
Ma muli o ka paʻa covalent me ke silika. No laila, pono e kaʻawale nā ʻātoma oxygen. E ho'ēmi i ka ikaika o ka repulsion ma waena o lākou. ʻO ka geometry maikaʻi loa e hōʻemi i ka repulsion ʻo ke ʻano tetrahedral.
Ua wehewehe mua ʻia kēia i ka makahiki 1824 no kahi hihia ma ke kuahiwi. Somma, Vesuvius, Italia. Ua loaʻa mai kona inoa mai ka English naturalist a me mineral collector Adolarius Jacob Forster.
Ke noiʻi ʻia nei ka pōhaku ma ke ʻano he biomaterial no nā implants. Ma muli o nā waiwai mechanical maikaʻi loa.
Nā waiwai waiwai
- Māhele: mesosilicates
- Kumu: magnesium silicate (Mg2SiO4)
- ʻōnaehana kristal daimana
- Papa kristal: dipyramidal
- kala: kala ʻole, ʻōmaʻomaʻo, melemele, melemele-'ōmaʻomaʻo, keʻokeʻo;
- ʻO ke ʻano o nā kristal: nā prisms dipyramidal, ka papa kuhikuhi pinepine, ka maʻamau a i ʻole ka paʻa, nui.
- Hui pālua: {100}, {011} a me {012}
- Neckline: kūpono no {010} kūpono 'ole no {100}
- ʻAha: conchoidal
- Mohs paakiki: 7
- Luster: vitreous
- Kaha: keʻokeʻo
- Mākaʻikaʻi: māliko a hiki i ka translucent
- Kaumaha kikoʻī: 3.21 - 3.33
- Nā waiwai okika: biaxial (+)
- ʻIkepili hoʻohālikelike: nα = 1.636 – 1.730 nβ = 1.650 – 1.739 nγ = 1.669 – 1.772
- Hoʻohālikelike ʻelua: δ = 0.033–0.042
- Huina 2B: 82°
- Kahi hehee: 1890°C
ka manaʻo forsterite a me nā waiwai lāʻau, nā pono metaphysical
He pseudo-scientific ka ʻāpana aʻe a ma muli o nā manaʻo moʻomeheu.
Loaʻa i ka kristal ke ʻano a me nā mea ho'ōla o nā ʻeha i hala. He pōhaku makamae me ka ikaika ho'ōla. ʻO kēia ka mea e hoʻopau ai i ka ʻeha e mau ana mai ka wā i hala. Hāʻawi ia iā ʻoe i ka ikaika e nānā i ka wā e hiki mai ana.
NPP
He aha nā noi no forsterite?
E like me nā pōhaku makamae no ka hoʻohana ʻana i nā ʻoihana e like me ke one refractory a me nā abrasives, magnesium ore a me nā ʻano mineral. Ua kapa ʻia ke aniani ma muli o ke kanaka kūlohelohe Kelemania ʻo Johann Forster. ʻO ia kekahi o nā minela ʻelua i kapa ʻia he olivine. ʻO ka mineral ʻelua he fayalite.
He aha ka ʻokoʻa mai ka fayalite?
ʻO Fayalite kahi pōhaku waiwai hao me ke ʻano maʻemaʻe Fe2SiO4. ʻO ka Forsterite he mea waiwai nui ka magnesium me kahi ʻano maʻemaʻe o Mg2SiO4. A i ʻole, paʻakikī lākou e ʻike, a kokoke i nā laʻana āpau o kēia mau minela ʻelua i loko o ka hao a me ka magnesium.
Ma hea kahi i ʻeli ʻia ai ka forsterite?
Loaʻa ka pōhaku ma nā dunites, gabbras, diabases, basalts a me nā trachytes. Aia nā wahi liʻiliʻi o ka fayalite i loko o nā pōhaku pele he ʻoi aku ka maʻamau o ka sodium ma mua o ka potassium. Loaʻa kēia mau mineral i loko o nā limestones dolomitic, nā kinikini, a me nā metamorphoses waiwai nui o ka hao.
Pehea e helu ai i ka olivine ma ka forsterite?
Plot of olivine-forsterite content (Fo = 100 * Mg / (total Mg + Fe), ratio of cations) versus the amount of Ca cations (mineral formula based on four oxygen atoms).
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