There are a number of features to look out for:
- The first might a six-sided or triangular cross-section or, if present, the appearance of raised triangular growth surfaces on flat terminating faces.
- There may be a series of intersecting fine lines meeting at 120/60º visible on top surfaces.
- The hexagonal bipyramid form typical of sapphire is very distinctive.
- And the presence of horizontal striations on pyramid or prism faces is a useful confirmation (quartz is the only other mineral to show this feature and can be distinguished by its much lighter feel or heft in the hand).
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