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Hornblende Mineral | Uses and Properties - Geology.com
Hornblende | Physical - Optical Properties, Occurrence, Uses
Hornblende: Mineral information, data and localities. - mindat.org
Hornblende - Wikipedia
Hornblende Mineral (Everything You Need to Know to ID them)
mindat.org - Hornblende root name group
Hornblende Mineral Specimens
Ferrohornblende Mineral Data
Raw Hornblende, Amphibole Mineral Specimens - Approx. 1"
16 Photo Gallery of Rocks in Hand Specimen and Thin Section
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