Mixed Gravel and Pebbles
Polylithic Alluvial Aggregate
igneous, sedimentary, and metamorphic mix
Category
Non Geological
Browse non geological specimens identified by the Rock Identifier community.
Learn about Non Geological in the encyclopedia
View all →
Quartz Vein in Basalt or Slate
Hydrothermal quartz vein traversing mafic host rock
metamorphic
Seashell Fragment
Calcium carbonate (CaCO3) - primarily Aragonite or Calcite
fossil
Granite
Intrusive igneous rock
igneous
Glauconite (Greensand Articulated Sandstone)
Glauconite ((K, Na)(Fe, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Vein-filled Sedimentary Rock
Silicified sedimentary rock with quartz/calcite vein
sedimentary
Limonite
FeO(OH)•nH2O
mineral
Fossilized Blastoid (Sea Bud)
Pentremites sp. (Echinodermata, Blastoidea)
fossil
Fossilized Brachiopod
Brachiopoda (e.g., Atrypa or Rhynchonellida)
fossil
Basalt with Quartz Vein
Extrusive Igneous Rock / Volcanic Rock
igneous
Cannonball Concretion
Calcite-cemented Sandstone Concretion
sedimentary
Sandstone Concretion
Sedimentary Concretion (Quartz sandstone with iron oxide cement)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) vein cutting through host rock
mineral
Fairy Stone (Staurolite Cross)
Staurolite (Fe2Al9O6(SiO4)4(O,OH)2)
mineral
Quartz Veined Quartzite or Sandstone
Quartzite with Quartz Veins (SiO2)
sedimentary
Petrified Wood
Silicified wood (SiO2)
fossil
Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Desert Rose
Gypsum rosette or Selenite (CaSO4·2H2O)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Crinoid Stem Fossil (in matrix)
Crinoid (Class Crinoidea)
fossil
Basalt with Quartz Veining
Basalt (SiO2-rich veins)
igneous
Fossilized Tabulate Coral (Honeycomb Coral)
Favosites sp. (Order: Tabulata)
fossil
Liesegang Rings (in Sandstone or Siltstone)
Ferruginous Sandstone with Liesegang Banding
sedimentary
Moqui Marble
Iron Oxide Concretion (Limonite/Hematite shell with Sandstone core)
sedimentary
Geode (Unopened)
Crystalline Quartz or Chalcedony filled Geode (SiO2)
sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary
Gastropod Internal Mold (Steinkern)
Class Gastropoda fossil mold (Phylum Mollusca)
sedimentary
White Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Manufactured Glass
Mixed Mineral Assortment (Pyrite, Kyanite, Agate, Jasper)
FeS2 (Pyrite), Al2SiO5 (Kyanite), SiO2 (Agate/Jasper)
mineral
Quartz (Milky/Snow)
Silicon Dioxide (SiO2)
mineral
Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Quartz (Rose Quartz or Chert variant)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled quartz-rich rock, likely milky quartz with feldspar
Quartz (SiO₂), probably with feldspar and minor iron-oxide inclusions
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral