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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Learn more about this topic:
from Geology 101: Physical GeologyChapter 2 / Lesson 3