Geography · Rocks and Minerals
प्राकृतिक रूप से पाए जाने वाले उस एल्युमिनियम ऑक्साइड खनिज की पहचान कीजिए जो आमतौर पर षTransactional कोणीय (hexagonal) बैरल के आकार के प्रिज्म बनाता है।
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