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Collection Tier:
Tier 3

Rocks and Minerals ➔ Common Opal

Identifier:
2019.1.1534
Description:
Opal is a silicate and a type of quartz. It is formed when silica fills small spaces in other rocks and is colorless in its pure form. This specimen was found in Querétaro, Mexico and was collected by A. E. Foote. 

Formula: SiO2 · nH2O
 
Date:
1880 – 1895
Source:
Museum Collection
Maker/Donor
Dr. A. E. Foote
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