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What is asterism in minerals?

Question:

What is asterism in minerals?

Inclusions in Gemstones

Gemstones exist in varying qualities based on a number of different factors such as their luster, color, and sometimes transparency. Inclusions are minerals that can affect the appearance of the gem.

Answer and Explanation:

In gemstones an asterism is caused by inclusions in some types of cabochons (gems without facets) that causes the appearance of a star formation in the gem. Gemstones with asterisms can have 4, 6, and 12 pointed stars.


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Other Earth Materials: Metals and Precious Rocks

from Geology 101: Physical Geology

Chapter 2 / Lesson 3
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