White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Category
Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Chrysocolla
Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
Chert (Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Fluorite Octahedron
Fluorite (Calcium Fluoride, CaF2)
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Granite (Pink/Red)
Phaneritic Igneous Rock (Rich in K-Feldspar)
Pyrite
Iron Disulfide (FeS2)
Limonite (after Pyrite Pseudomorph)
Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)
Coquina
Coquina (Bioclastic Limestone)
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
Moonstone
Orthoclase Feldspar (formula: (K,Na)AlSi3O8)
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Quartz Geode in Chert/Limestone Matrix
Silicon Dioxide (SiO2) within Sedimentary Host Rock
Quartz (specifically Milky or Clear Quartz)
Silicon Dioxide (SiO2)
Rock Crystal Quartz
Quartz (SiO₂)
Alexandrite in Matrix
Chrysoberyl (BeAl2O4 with Chromium impurities)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Pyrite
Iron Sulfide (FeS2)
Pegmatitic Granite
Granite with Orthoclase Feldspar and Quartz (SiO2, KAlSi3O8)
Sandstone (specifically an Iron-Concretion)
Arenite with Iron Oxide (Limonite/Goethite) cementation
Amazonite
Potassium Aluminum Silicate (KAlSi3O8)
Clear Quartz
Silicon Dioxide (SiO2)
Fluorite
Calcium Fluoride (CaF2)
Limestone
Calcium Carbonate (CaCO3)
Sandstone
Arenite (primarily SiO2)
Granite (Pink/Potassium Feldspar Granite)
Felsic Plutonic Rock (Potassium Feldspar, Quartz, Mica, and Amphibole)
Grey Quartzite Pebble
Quartzite (primarily SiO2 - Silicon Dioxide)
Chert (often called Flint for darker varieties)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
Chert (Quartz Variety)
Chert (Silicon Dioxide, SiO2)
Azurite and Malachite on Matrix
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2
Iron Gossan (Limonite/Goethite)
Hydrated Iron Oxides (FeO(OH)·nH2O) from oxidation zones
Sandstone (with Limonite staining)
Arenite (FeOx-rich)
Jasper (Tiger Eye variety transition)
Silicon Dioxide (SiO2) with iron oxide inclusions
Smoky Quartz
Silicon Dioxide (SiO2)
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
Quartz
Quartz (Silicon Dioxide - SiO2)
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
Silver (Jewelry Specimen)
Native Silver (Ag)