Identify the naturally occurring aluminum oxide mineral that typically forms hexagonal barrel-shaped prisms.

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**Solution:**

1. The mineral in question is a naturally occurring aluminum oxide, chemically represented as $	ext{Al}_2	ext{O}_3$.

2. Among the options, **Corundum** is the aluminum oxide mineral known for forming hexagonal barrel-shaped prisms.

3. Corundum is notable for its exceptional hardness, ranking 9 on the Mohs scale, making it one of the hardest minerals after diamond.

4. It is the primary mineral source for precious gemstones such as sapphires and rubies, which differ in color due to trace elements like chromium.

5. Corundum commonly occurs in metamorphic rocks such as schist and marble.

6. Other options like Dolomite, Olivine, and Chalcopyrite do not match the chemical composition or crystal habit described.

**Answer:** Corundum

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