Olivin magniy-temir silikat mineralidir, ortorombik kristall sistemaga mansub. Seffiyaviy indeks 1.654-1.690, va ikki sinishi farqi ancha yuqori 0.036. Qimmatbaho tosh stolidan, pastki fasetning tizma chiziqlari bir-biriga yopishib qoladi., dispersiya tezligi 0.020, solishtirma og'irlik 3.27 ga 3.48, va qattiqlik 6.5 ga 7. In addition to the typical yellow-green, olivine has other colors such as colorless, yellow or brown. This is due to the relationship between magnesium and iron, and brown is the result of oxidation of yellow-green iron olivine.
The most common olivine in the market is mainly faceted cut, and there are many olivines cut into egg noodles. Because large olivine crystals are quite common, olivine gems with high carat numbers are easy to obtain and the price is very high. Approachable.
Olivine is characterized by its very high birefringence difference. As long as you use a handheld 10x magnifying glass to observe the ridgeline of the bottom facet from the desktop, you can see obvious double shadows, even on large faceted olivines as long as you get close. Ikkita soya hodisasini tekshirish orqali topish mumkin. Bu olivinni aniqlashning eng oson usuli.
Umuman, qirrali olivinning tiniqligi juda yuqori, va inkluzyonlarni yalang'och ko'z bilan topish oson emas. Olivinni tanlashda, rang ustuvor hisoblanadi, chunki bu olivin narxini belgilovchi eng muhim omil. Rang qanchalik kuchli bo'lsa. Saylov uchun.
Qadimgi Misrda, St. Qizil dengizdagi Jon oroli olivinning asosiy ishlab chiqarish maydoni edi. Bu yerda olivin qazib olish ko'proq tarixga ega 3,500 yillar. Keyinchalik, boshqa ishlab chiqarish maydonlari birin-ketin kashf qilindi. Bugun, dunyodagi olivinning asosiy ishlab chiqaruvchi hududlari Myanma hisoblanadi, Sri-lika, Braziliya, Janubiy Afrika, Amerika Qo'shma Shtatlari va Avstraliya.
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