Calamites (Fossilized Horsetail)
Calamites suckowii (Family: Calamitaceae)
sedimentary
Category
Sedimentary Rock Or Mineral (Depending On Origin And Purity)
Browse sedimentary rock or mineral (depending on origin and purity) specimens identified by the Rock Identifier community.
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Sandstone or Mudstone
Sedimentary Rock (Sandstone/Mudstone)
sedimentary
Fossilized Bone Fragment
Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
sedimentary
Amethyst
SiO2 (Silicon Dioxide with Iron impurities and natural radiation influence)
mineral
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Sandstone (specifically an Iron-Concretion)
Arenite with Iron Oxide (Limonite/Goethite) cementation
sedimentary
Turquoise in Matrix
Hydrous phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Metallic Ornament / Jewelry
N/A - This is an artificial object, not a geological specimen.
This appears to be a man-made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen.
Ferruginous Quartz (Carnelian-tinted Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite
Metamorphic rock
Sandstone (Pebble)
Sandstone (arenite, arkose, wacke depending on composition)
sedimentary
Collection of Minerals and Ores
Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)
mineral
Quartz Pebble (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Black Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Chalcedony (Quartz Nodule)
Silicon Dioxide (SiO2)
mineral
Agate
Agate (Microcrystalline Quartz, SiO2)
mineral
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Gold Flake / Placer Gold
Native Gold (Au)
mineral
Almandine Garnet in Matrix
Almandine (Fe3Al2(SiO4)3)
metamorphic
Quartz Druzy (on Calcedony/Quartz base)
Silicon Dioxide (SiO2)
mineral
Granite Gneiss
Gneiss (derived from granitic protolith)
metamorphic
Bull Quartz (White Quartz)
Silicon Dioxide (SiO2)
mineral
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Asphalt
Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)
Sedimentary
Quartz (Milk/Citrine variety)
Silicon Dioxide (SiO2)
mineral
Agate (specifically Carnelian Agate or Lake Superior style Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Gold Nugget
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Limestone (specifically Marl or Chalk)
Calcium Carbonate (CaCO3)
sedimentary
Peridot
Olivine (specifically, the gem-quality variety forsterite, (Mg,Fe)2SiO4)
Mineral
Iron Slag
Anthropogenic Iron Silicate
industrial byproduct
Blue Calcite
Calcium Carbonate (CaCO3)
mineral