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
Current Location Status:
In Storage
Collection Tier:
Tier 3
Source:
Museum Collection
Related Entity:
Dr. A. E. Foote (was collected by) Albert Edward Foote was one of America's most famous early mineral dealers.