
dard

dard ack bahut hii durlabh boret khanij haye. yeh pahali baar myanmar mein british khanij vigyaani aur ratna vikreta arther see dwara paaya gayaa thaa.dee. dard jisane ise rubi key roop mein galat pehchaan dee, jaba taka kii 1950 key dashak mein ise ack nae ratna key roop mein naheen khoja gayaa. jaba isaki pushti ack naee khanij prajaati key roop mein hui, tou khanij kaa naam unake naam parr rakhaa gayaa. isaki durlabhata key kaaran, dard kii keemat prati carrett 50,000 dollar seey 60,000 dollar key beach hoe sakati haye. 
dard key rasayanik banaavat mein calcium, zirconium, boron, aluminium aur oxygen (casral9oh15 (beeo3)) hotaa haye. khanij mein chromium aur vanadium kii kuchh matra bhee hoti haye, joe aamtaur parr narangi-laal seey bhoore-laal rung key liye jimmedaar hotey hain, joe kii pokhraj key samaan hotey hain. khanij kii durlabhata iss tathya key kaaran haye kii zirconium aur boron prakriti mein shayed hii kabhi ack dusare key saath baatchit karate hain. chrystal praakritik roop seey shatkon aakar key hotey hain, lekin euhedral yaa orthorombic bhee hoe sakate hain. unamen koee kristaliya sanrachana bhee naheen hoe sakati haye, lekin aamtaur parr ack kristaliya sanrachana key saath hoti haye. 2004 key anta taka, kewal dou hii ratnon koo tarasha gayaa thaa.
khoj aur ghatana.
mogok key aspas key kshetra mein vyaapak anveshan, jisamen khanij key astitva key liye jaane jaane vaale behad chhote kshetra kaa ack badaa hissa shamil haye, ney kaee naee dard kii ghatnaaon kii pehchaan kii haye, jinake parinamswarup kaee hazaar nae upalabdh dard key namoone paae gaye hain.

