Crystals
Shark teeth
Fossil Shark Teeth • mineralized dental remains of sharks and related cartilaginous fishes Crown • highly mineralized enameloid over dentine Root • porous dentine-rich anchoring tissues Fossil color • controlled...
Shark teeth
Fossil Shark Teeth • mineralized dental remains of sharks and related cartilaginous fishes Crown • highly mineralized enameloid over dentine Root • porous dentine-rich anchoring tissues Fossil color • controlled...
Red tiger eye
Red Tiger Eye • chatoyant quartz-rich aggregate with aligned, altered riebeckite-crocidolite fiber trails Trade names • bull’s-eye and ox’s-eye Color • hematite-rich red, rust, brick, and mahogany Optical effect •...
Red tiger eye
Red Tiger Eye • chatoyant quartz-rich aggregate with aligned, altered riebeckite-crocidolite fiber trails Trade names • bull’s-eye and ox’s-eye Color • hematite-rich red, rust, brick, and mahogany Optical effect •...
Quartz with inclusions
Quartz with inclusions • SiO₂ enclosing minerals, fluids, gases, cavities, fractures, and earlier growth surfaces Solid inclusions • rutile, tourmaline, chlorite, hematite, pyrite, titanium oxides Scenic structures • gardens, mosses,...
Quartz with inclusions
Quartz with inclusions • SiO₂ enclosing minerals, fluids, gases, cavities, fractures, and earlier growth surfaces Solid inclusions • rutile, tourmaline, chlorite, hematite, pyrite, titanium oxides Scenic structures • gardens, mosses,...
Oolite
Oolite • sedimentary rock dominated by coated grains called ooids Ooids • commonly about 0.25–2 mm across Classic composition • calcite or aragonite cortices and carbonate cement Related rocks •...
Oolite
Oolite • sedimentary rock dominated by coated grains called ooids Ooids • commonly about 0.25–2 mm across Classic composition • calcite or aragonite cortices and carbonate cement Related rocks •...
Nuummite
Nuummite • trade and rock name for iridescent orthoamphibole material associated especially with the Nuuk district of southwestern Greenland Principal optical minerals • anthophyllite and gedrite Common flashes • gold,...
Nuummite
Nuummite • trade and rock name for iridescent orthoamphibole material associated especially with the Nuuk district of southwestern Greenland Principal optical minerals • anthophyllite and gedrite Common flashes • gold,...
Moldavite
Moldavite • green Central European tektite formed from terrestrial material during the Ries impact Impact event • Nördlinger Ries, southern Germany Age • approximately 14.8 million years Strewn field •...
Moldavite
Moldavite • green Central European tektite formed from terrestrial material during the Ries impact Impact event • Nördlinger Ries, southern Germany Age • approximately 14.8 million years Strewn field •...