Bytownite he mema whakahirahira o te rōpū plagioclase feldspar, e whakaatu ana i te whānuitanga hanganga motuhake i roto i te raupapa wairewa-totoka albite-anorthite. I whakamāramatia matū hei konupūmā-konutai aluminosilicate me te tātai (Ca,Na)[Al(Al,Si)Si₂O₈], ka whakarōpūtia motuhake a bytownite e te ōrau ira o te anorthite, e 70% ki te 90% (An₇₀–An₉₀). Ko tēnei ihirangi konupūmā teitei e whakatakoto ana i waenganui i te labradorite e whānuitia ana me te pito-mutunga calcic, te anorthite. I te taha tinana, ka puta hei tioata tae-kore, mā, hina rānei, ahakoa i ētahi wā ka whakaatu i te atarangi kākāriki, kōwhai rānei. Ki te pakeke Mohs o 6 ki te 6.5 me te pūnaha tioata triclinic, kei a ia te wehenga tino pai o te rōpū feldspar, e whakaatu ana i ngā rīpene māhanga āhua iti i raro i te tirotiro whakaahua.
Ko te hanganga o te bytownite he tukanga magmatic pārūrū nui. E ai ki a Bowen’s Reaction Series, ko tētahi o ngā kōhuke tuatahi e whakapīoioio ana i te wā e tīmata ana te mātao o te magma mafic, i muri i te parataiao tuatahi o te olivine me te pyroxene. Nā reira, he wāhanga hanga toka matua te bytownite i roto i ngā toka igneous taketake, pērā i te gabbro, te norite, me te troctolite. Ka kitea nuitia i roto i ngā pūhui toka igneous paparanga nunui pērā i te Stillwater Complex i Montana, e hanga ai i ngā paparanga nui o te kirinuku o Raro o te whenua. I tua atu i ngā taiao o te whenua, kua kitea hoki te bytownite i roto i ngā toka o te marama me ngā meteorite toka, e tohu ana i tōna pūmau i roto i ngā taiao whakapīoioio pēhanga iti, pārūrū nui o ngā kirinuku aorangi puta noa i te pūnaha rā.
Ko te whakaingoatanga me te hītori o te bytownite e tino hono ana ki te torotoro whenua o te rautau 1800 o Amerika ki te Raki. I whakaingoatia tuatahitia te kohuke me te whakamārama i te tau 1836 e te kaimātai matū Kōtimana a Thomas Thomson, nāna i tango te ingoa mai i “Bytown,” te ingoa taketake o te tāone i huri hei Ottawa, te whakapaipai o Kānata. I kitea te rawa momo taketake i roto i te toka hukapapa kākāriki-mā i kitea tata ki te tāone. Heoi, he āhua rereke te hītori o te bytownite; i kitea e ngā rangahau i te timatanga o te rautau 1900, ko ngā tauira taketake mai i Bytown he ranunga matatini o ngā kohuke rerekē, kaua ko te momo parakore kotahi. Ahakoa tēnei kōruaruatanga tuatahi, i puritia te ingoa e te International Mineralogical Association hei whakataurite i te whakaahuatanga o ngā feldspars plagioclase i roto i te awhe 70% ki te 90% anorthite. I tēnei rā, ahakoa kua ngaro te wāhi taketake o Bytown i te hītori, kei te noho tonu te kupu hei mea tino nui ki ngā tohunga pōhatu mō te whakarōpū i ngā toka mafic me te mārama ki te whanaketanga matū o ngā rūma magma.
E tika ana a Bytownite mō te whakapaipai?
Bytownite ka whakarōpūtia hei “kohatu mā ngā kaikohikohi.” Me te pakeke o Mohs mai i te 6 ki te 6.5, he roa tōna kaha mō ngā momo whakapaipai kāore e pāngia e te whakapā kaha, pērā i ngā taimana, ngā whakakai taringa, me ngā pine. Heoi, nā te mea he tino wehenga ōna ki ngā huarahi e rua, ka māmā te whati inā patua kaha, nā reira kāore e tino pai mō ngā mowhiti o ia rā, engari me whakanoho ki tētahi whakatakotoranga tiaki.
Ko te kaha o te bytownite i roto i nga whakapaipai kei roto i tona marama me tona kanapa. Ko nga tauira kounga teitei he maha nga wa e whakapaipaihia ana ki nga tapahi kanapa e whakaatu ana i te kanapa ataahua o te karaihe (rite karaihe). Ahakoa he kapua te nuinga o te bytownite, ka whakanuia te bytownite o te kounga kohatu mo tona maarama me tona papanga tae mohio—mai i te kowhai kakau-whaariki ki te koura-honi me te hamapaina. Ko enei tae mahana, me tona onge i roto i nga toa whakapaipai arumoni, ka waiho hei mea tino pai mo te hunga e rapu ana i nga mea ahurei, mahi toi.
Ngā Momo me ngā Rerekētanga Rongonui
Ko ngā momo Bytownite e wehewehea ana i te nuinga o te wā mā ōna āhuatanga whatu me ōna takenga ā-whenua, kaua mā ngā ingoa hokohoko ōkawa:
Kōura Paitawanaita Ko te momo tino rongonui mō te whakairo, he mea whiwhi mai i ngā rohe puia i Meheko me te Hononga o Amerika (Oregon). E whakanuia ana mō tōna māramatanga tino pai me ōna kākano kōura māhana.
Kōrakorako Bytownite Ahakoa he maha ake te kitea o te labradorescence i roto i te labradorite, ko ngā kōhatu e noho ana i te rohe matū (tata ki te An70) ka whakaatu pea i te takahuri ātaahua o te tae, e whiti ana ngā uira o te kahurangi konganuku, te kākāriki rānei.
Maskeliniti He momo whakamīharo e kitea ana i roto i ngā meteorite. Ko tēnei te bytownite kua hurihia hei karaihe māori e ngā ngaru tūkino kaha o tētahi pānga ātea, e tiaki ana i te matū o te kohuke engari e whakamōtī ana i tōna hanganga tioata.
Ngā Whakamahinga Whaihua me te Ahumahi
Ko te Bytownite he mahi matua i roto i ngā rāngai pūtaiao me te ahumahi, e whakawhānui ana i tōna whaihua ki tua atu o tōna tūranga hei tauira kohikohi. Ki ngā tohunga pōhaku, ko te kohuke he “pūranga matū” mōhiohio; mā te āta tātari i te ōwehenga motuhake o te konupūmā ki te konutai i roto i tōna tukutuku tioata, ka taea e ngā kairangahau te whakahou i te hītori whakamatao me ngā āhuatanga pēhanga whakamauri o ngā rūma magma i ahu mai ai te kōhatu kāinga. Nā tēnei ka waiho te Bytownite hei taputapu tino nui hei mārama ki ngā tukanga whenua hihiko o te kirinuku o te whenua, tae atu ki te hītori puia o ētahi atu tinana aorangi.
I roto i tētahi kaha tino kitea, whānui hoki, ka whakamahia te bytownite ki te ahumahi hanga whare. Ina kitea i tōna āhua papatipu hei wāhanga matua o ngā toka mafic pērā i te gabbro, te basalt rānei, ka mahia hei whakaurunga kōhatu kuru kounga teitei. Nā tōna kiato nui me tōna ātete māori ki te kakahu matihiko, e whakaarohia ana he rauemi tino pai hei hanga raima kaha-nui, hei whakapūmau i ngā papa huarahi, hei whakarato hoki i te peihana mauroa mō ngā ara tereina. I tua atu, pērā i ētahi atu o te whānau feldspar, ka whai hua te bytownite i ngā tūmahi motuhake o te mahi uku me te mahi karaihe. Ina whakapuehuatia ki te paura pai, ka mahi hei kaihoko rewa hei whakaheke i te pāmahana whakarere o te alumina me te silica. Ko tēnei wawaotanga matū kāore e whakapai ake ana i te pūngao hanganga me te ātete matū o te hua whakamutunga, engari ka whakaiti rawa hoki i te whakamahinga pūngao i te wā o te tukanga mahi, e whakahāngai ana i te mahinga hangarau ki te pai o te ahumahi.