• The naturally occurring aluminum oxide mineral that typically forms hexagonal barrel-shaped prisms is corundum.
• Corundum crystallizes in the trigonal system, commonly forming hexagonal prisms that may taper at both ends, resulting in a barrel-like shape.
• Other oxides of Aluminium
○ Al₂O₃ (commonly known as alumina, the most stable and widely occurring oxide).
○ Al₂O (hypothetical and less stable, observed in specific chemical reactions or matrix isolation).
○ AlO (a rare, unstable oxide formed in high-temperature or gaseous states).
Study Notes
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