طلا در طبیعت چگونه یافت میشود؟. طبق تحقیقات اخیر و سال ها تجربه، آمارها نشان می دهد که 244000 تن طلا و 57000 ذخایر زیر زمینی تا کنون کشف و یافته شده است که قسمت عمده طلا های کشف شده مربوط به سه کشور ...
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9- انواع مختلف سنگ های قیمتی و نیمه قیمتی. روش كار: تراش صفحه ای. تراش ساده. تراش مرکب. 1- تراش صفحه ای در مورد سنگها و بلورهای گرانبها و شفاف اعمال می شود که تراش هرچه بیشتر صفحات سبب جلای بهتر و ...
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