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Portugal maxsus bilaguzuklari oltin Binafsha rangga o'xshash marvarid: arqon

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Iolit, uning inglizcha nomi Iolite, yunoncha so'zdan kelib chiqqan, ma'no "binafsha", marvarid darajasidagi rang xususiyatlarini ko'rsatadi. Shuningdek, u bir nechta inglizcha nomlarga ega, ulardan biri kordiyeritdir, 19-asrda mineralni birinchi marta tasvirlab bergan frantsuz geologi sharafiga nomlangan, Per Louis Dental Die (PLCordier); ikkinchisi, Dikroit, yunonchadan ham, degani "ikki rangli", chunki bu mineral juda aniq "dikroik", Shunday qilib, u ham deyiladi "ikki rangli tosh". Bunga qo'chimcha, chunki u Birmada ishlab chiqarilgan indigo ko'k sapfirga juda o'xshaydi, va u ko'pincha suvni o'z ichiga oladi, ning obro'siga ham ega "suv sapfiri".

Kordiyerit alyuminiyli silikat mineralidir. Bu orthorbomik kristalli tizimga tegishli. Kristallar qisqa ustunli, va psevdo-olti burchakli ustunli penetratsion uch kristall keng tarqalgan. Kristallar tarkibida slyuda bo'lishi mumkin, sillimanit, staurolit, va shpinel. Tosh kabi qo'shimchalar, tsirkon, apatsit, va hokazo., the aggregates are massive or granular. It has glass luster, shaffof uchun shaffof, va qattiqlik 7.0-7.5. The color of cordierite is blue and purple-blue, and there are also yellow, och sariq, och yashil, or light brown, with colorless streaks. One of its outstanding features is its strong pleochroism. The pleochroism of purple crystals is light purple, dark purple and yellow to brown; while the pleochroism of blue crystals is colorless to yellow and blue to gray. And dark purple, so when you observe it with the naked eye from different directions, you will find its body: the change is large, one direction is indigo blue, the other direction may appear very light yellow or colorless. Those with starlight and cat-eye effects are rare in cordierite.

Cordierite not only has an attractive color, but also has good toughness, so it is used as a gem. Translucent blue and purple cordierite can be polished into a curved interface, while transparent ones can be processed into faceted gems. Blue cordierite is cut and shaped like sapphire, but because the hardness, specific gravity and refractive index of blue cordierite are not as good as sapphire, and cordierite has strong pleochroism, it is not difficult to distinguish the two. Although gem-grade cordierite treasures are rare, they have been discovered. In the British Museum of Natural History in London, Angliya, there is an egg-round treasure-shaped cordierite. U og'irlik qiladi 885 karatlar; a blue cordierite weighing 15.6 carats and an indigo cordierite weighing 10.2 carats are also hidden in the Smithsonian Museum in Washington, AQSh, both produced in Sri Lanka.

Cordierite is a typical metamorphic mineral. It is mostly found in gneiss, crystalline schist and contact metamorphic rocks. It is often symbiosis with hornblende minerals such as biotite, sillimanit, and basic plagioclase. Placer is the main source of gem-grade cordierite, the main producing areas are Sri Lanka, Braziliya, Hindiston, Mianmar, Maqtanchoqlik, Finland and Norway.

 

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