De Re Metallica, Title Page, 16th
Science Source
Petrified Wood Tree Trunk Section #4
Millard H. Sharp
De Re Metallica, Metallurgy Workshop
Science Source
Pink Tourmaline
Millard H. Sharp
Gold From The Forest Hill District
Joel E. Arem
Gold Nugget #1
Millard H. Sharp
Georgius Agricola, German Scholar #1
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Carlsbad Caverns #1
Photo Researchers, Inc.
Mikhail Lomonosov #2
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Amethyst Geode
Louise K Broman
Lime Green Calcite #1
Millard H. Sharp
Topaz From The Thomas Range, Utah
Joel E. Arem
Rubellite Tourmalines
Joel E. Arem
Rocks And Minerals #1
Photo Researchers
Diopside In Uv Light #1
Ted Kinsman
Lapis Lazuli
Millard H. Sharp
Peridot Crystals
Millard H. Sharp
Tangerine Quartz Crystals #2
Millard H. Sharp
Laguna Agate
Millard H. Sharp
Amethyst Geode #1
Millard H. Sharp
Amethyst Crystals #3
Millard H. Sharp
Australian Opal #2
Millard H. Sharp
Mexican Lace Agate
Louise K. Broman
Tourmaline Elbaite From Brazil
Joel E. Arem
Aquamarine Gemstone #1
Joel E. Arem
Plume Agate Details, Close
Mark Windom
Agate From Brazil, Lm #16
Bernardo Cesare
Lake Superior Agate #1
Ted Kinsman
Australian Opal #1
Millard H Sharp
Australian Opal #7
Millard H. Sharp
Peridot Gemstone #2
Joel E. Arem
Agate From Brazil, Lm #14
Bernardo Cesare
Phosphorescent Desert Rose Barite #2
Ted Kinsman
Blue Halite & Red Sylvite
Charles D. Winters
Amazonite Crystal
Millard H. Sharp
James Dwight Dana, American Geologist
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Selenite Crystals #1
Millard H. Sharp
Agatized Fossil Coral
Millard H. Sharp
Pyrite #3
Photo Researchers
Sem Of A Diamond
Ted Kinsman
Optical Calcite
Ted Kinsman
Agate Geode
Millard H. Sharp
Geode With Chalcedony
Millard H. Sharp
Calcite Iceland Spar
Millard H. Sharp
Sand Included Calcite Crystals
Millard H. Sharp
Olivine Gabbro
Ray Simons
Cobaltian Calcite
Millard H. Sharp
Wulfenite #1
Millard H. Sharp
Barite Crystals
Millard H. Sharp
Black Amethyst
Millard H. Sharp
Malachite #7
Millard H. Sharp
Quartz Crystals #9
Millard H. Sharp
Native Gold
Millard H. Sharp
Amazonite #1
Millard H. Sharp
Globular Smithsonite
Millard H. Sharp
Quartz Crystals #17
Millard H. Sharp
Cerussite
Gary Retherford
Diamonds #2
Phillip Hayson
Rhodochrosite
E.r. Degginger
Calcite Twin Crystals
Millard H. Sharp
Zircon Gemstones #1
Joel E. Arem
Apatite, Color Suite
Joel E. Arem
Amethyst #1
Millard H. Sharp
Fluorite With Galena And Quartz
Millard H. Sharp
Rhodonite #1
Millard H. Sharp
Rhodochrosite #11
Millard H. Sharp
Agate From Brazil, Lm #33
Bernardo Cesare