Black Tourmaline in Quartz
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) in Silicon Dioxide (SiO2)
igneous
Category
Mineral (Processed Alloy)
Browse mineral (processed alloy) specimens identified by the Rock Identifier community.
Snowflake Obsidian
Spherulitic Obsidian (primarily SiO2 with Cristobalite inclusions)
igneous
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Pink Aragonite
CaCO3
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Garden Quartz (Lodolite)
Quartz with inclusions (SiO2 + various inclusions such as Chlorite, Hematite, or Feldspar)
mineral
Banded Gneiss
Gneiss
metamorphic
Morganite and Aquamarine (Beryl) Bracelet
Beryllium aluminum silicate, Be3Al2(SiO3)6
gemstone
Mixed Gemstone and Mineral Collection
Mixed Silica and Carbonate minerals (SiO2, CaSO4·2H2O, etc.)
mineral
Porphyritic Basalt
Porphyritic Basalt with Olivine phenocrysts
igneous
Graphite
Graphite (Carbon, C)
mineral
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Titanium-Coated Hematite (Aura Hematite)
Titanium-bonded Hematite (Fe2O3 with a Ti coating)
mineral
Garnet Schist
Garnetiferous Mica Schist
metamorphic
Likely quartz-rich rock fragment
Indeterminate; possibly quartz-bearing granite or quartzite
igneous
Small metallic mineral fragment
Unidentified metallic sulfide or native-metal fragment
mineral
Black Jasper
Silicon dioxide (SiO2) with carbon/mineral inclusions
sedimentary
Lepidolite Ore
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Fossilized Shark Tooth (Root Portion)
Selachimorpha (partial specimen)
fossil
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Aquamarine (Tumbled)
Beryl (Be3Al2Si6O18)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Magnetite (Small Granule)
Magnetite (Fe3O4)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Hematite
Hematite (Fe2O3)
mineral
Hematite
Iron oxide (Fe2O3)
mineral
Mammoth or Mastodon Tooth Fossil
Mammuthus / Mammut tooth
fossil
Tiger's Eye
Silicon Dioxide (Quartz pseudomorph after crocidolite), $SiO_2$
mineral
Shark Tooth Fossil
Vertebrate fossilized tooth (Chondrichthyes)
fossil
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite mica)
metamorphic
Orange Calcite point
Calcite (Calcium Carbonate, CaCO3)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Assorted Beach Rocks and Pebbles
Various (Granite, Basalt, Quartz, Conglomerate, etc.)
igneous, sedimentary, metamorphic
Petrified Wood
Silicified Wood / Chalcedony (SiO2)
mineral