Gold Nugget
Native Gold (Au)
mineral
Category
This Appears To Be A Man Made Metallic Object, Likely Jewelry, Not A Natural Rock, Mineral, Or Geological Specimen.
Browse this appears to be a man made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen. specimens identified by the Rock Identifier community.
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
sedimentary
Chalcedony (Smoky Quartz or Agate nodule fragment)
Silicon Dioxide (SiO2)
mineral
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks
Chert Nodule (Commonly known as Flint or River Rock)
Silicon Dioxide (SiO2)
sedimentary
Quartz with Iron Oxide Monzonite or Sandstone contact
Quartz (SiO2) with Limonite/Hematite staining
mineral
Sandstone with Magnetite and Iron Staining
Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)
sedimentary
Beaded Jewelry (Assorted Gemstones)
Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ
Mineral, Jewelry
Basalt Riverstone
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Calcite (Yellow/Orange variety - sometimes called Honey Calcite)
Calcite
Mineral
Quartz (Milky or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Sandstone (Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Natural Gold Nugget
Native Gold (Au)
mineral
Chalcedony Nodule in Matrix
Silicon Dioxide (SiO2)
mineral
Citrine
Quartz (SiO2) - specifically, a variety of macrocrystalline quartz
mineral
Pyrite in Matrix (likely Quartz or Coal)
Iron Sulfide (FeS2)
mineral
Green Aventurine (likely)
Silicon dioxide (SiO2) with fuchsitemica inclusions
Mineral (specifically a variety of Quartz)
Schist (Garnet-Mica Schist)
Garnetiferous Mica Schist (primarily Muscovite/Biotite and Almandine Garnet)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Mineral within Sedimentary Rock
Calcite
Calcium Carbonate (CaCO3)
mineral
Onyx (beads)
SiO2 (Cryptocrystalline Quartz)
Mineral
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Sandstone with Manganese Dendrites
Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)
sedimentary
Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Mineral, potentially a rock with chalcedony/jasper.
Chalcedony with inclusions (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Slag (Industrial Glassy Byproduct)
Ferro-silicate Slag
Anthropogenic / Non-Natural
Fire Opal
Hydrated Silica (SiO2·nH2O)
mineral
Orange Quartzite Pebble
Quartzite (SiO2)
metamorphic
Garnet Beads
Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)
Mineral
Travertine (Ceramic Tile)
Terrestrial Sedimentary Rock / Calcium Carbonate (CaCO3)
sedimentary
Herkimer Diamond (Quartz Crystal)
Silicon Dioxide (SiO2)
mineral
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral