Calcite Birefringence
Hermann Eisenbeiss
Calcite Crystals #5
Millard H. Sharp
Calcite Crystal
Hermann Eisenbeiss
Calcite On Quartz
Millard H. Sharp
Calcite Crystals #7
Millard H. Sharp
Calcite Crystals #8
Millard H. Sharp
Calcite Crystals #6
Millard H. Sharp
Calcite #3
Millard H. Sharp
Calcite #1
Millard H. Sharp
Calcite #2
Millard H. Sharp
Calcite With Sand Inclusions
Millard H. Sharp
Calcite Twin Crystals
Millard H. Sharp
Calcite #4
Millard H. Sharp
Calcite #1
Charles Winters
Manganoan Calcite
Millard H. Sharp
Magnetite With Calcite
A.b. Joyce
Plattnerite With Calcite
A.b. Joyce
Lime Green Calcite #1
Millard H. Sharp
Septarian Concretion #1
A.b. Joyce
Septarian Concretion
A.b. Joyce
Sem Of Eggshell
Dee Breger
Tufa Towers At Mono Lake
James Steinberg
Galena #1
Charles Winters
Galena #2
Charles Winters
Stalactites, Castellana Caves, Italy
Francesco Tomasinelli
Galena #3
Charles Winters
Calcite Amphora, Egyptian, 1400 Bc
Millard H. Sharp
Calcite Crystals #2
Meckes/ottawa
Calcite Crystals #6
Meckes/ottawa
Calcite Crystals #8
Meckes/ottawa
Calcite Crystals #1
Meckes/ottawa
Calcite Crystals #3
Meckes/ottawa
Calcite Crystals
Meckes/ottawa
Calcite Crystals #4
Meckes/ottawa
Calcite Crystals #7
Meckes/ottawa
Calcite Iceland Spar
Millard H. Sharp
Calcite Crystals #5
Meckes/ottawa
Calcite & Celestite
Millard H. Sharp
Calcite Crystal
Millard H. Sharp
Calcite From Missouri
Joel E. Arem
Calcite On Amethyst Crystals
Millard H Sharp
Calcite From Rosiclare, Illinois
Joel E. Arem
Calcite In Uv Light #1
Ted Kinsman
Calcite Crystals
Millard H. Sharp
Calcite Crystals #1
Millard H. Sharp
Calcite & Stilbite On Quartz
Millard H. Sharp
Calcite From Missouri #1
Joel E. Arem
Calcite In Uv Light
Ted Kinsman
Calcite Crystals #2
Millard H. Sharp
Calcite In White Light
Ted Kinsman
Calcite Crystals #4
Millard H. Sharp
Calcite Crystals On Limestone
Millard H. Sharp
Calcite On Quartz Crystal
Millard H. Sharp
Calcite Crystals #3
Millard H. Sharp
Calcite Under Visible Light
Ted Kinsman
Speleothems In Wind Cave
Fletcher & Baylis
Diopside In Uv Light #1
Ted Kinsman
Fossilized Coccoliths, Emiliania
Biophoto Associates
Limestone With Fossils
M. I. Walker
Sand Included Calcite Crystals
Millard H. Sharp
Fluorescing Calcite & Willemite
E.r. Degginger
Optical Calcite #1
Ted Kinsman
Optical Calcite #3
Ted Kinsman
Fossil Clam With Calcite Crystals
Millard H. Sharp
Lime Green Calcite
Millard H. Sharp
Optical Calcite #2
Ted Kinsman
Optical Calcite #4
Ted Kinsman
Optical Calcite
Ted Kinsman
Fossil Clam With Calcite Crystals #1
Millard H. Sharp