Exposed bedrock outcrop, likely basaltic volcanic rock
Likely basalt or andesite; exact identification requires a close hand-sample view
igneous
Category
Not A Geological Specimen
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Clear Quartz
Silicon Dioxide (SiO2)
mineral
Small weathered rock fragment
Indeterminate; possibly carbonate-rich sandstone or limestone
sedimentary
Quartz pebble or seed/crumb
SiO2 (if quartz)
mineral
Quartz with Chlorite inclusions
SiO2 with (Mg,Fe)3(Si,Al)4O10(OH)2⋅(Mg,Fe)3(OH)6
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Fossilized Shark Tooth (Sand Tiger)
Carcharias taurus (fossil specimen)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Brachiopod Shell
Order Spiriferida (likely)
fossil
Copper Ore / Altered Granodiorite
Cupriferous rock with silicate gangue
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Moqui Marble
Iron Oxide Concretion (Limonite/Hematite shell with Sandstone core)
sedimentary
Vein-filled Sedimentary Rock
Silicified sedimentary rock with quartz/calcite vein
sedimentary
Unidentified polished dark stone with a possible quartz fragment
Indeterminate; appearance may reflect polished basalt, obsidian, or iron-rich rock, with a pale quartz/feldspar inclusion
mineral
Garnet
Garnet Group (Silicate Minerals), formula varies e.g., Alm: Fe3Al2(SiO4)3
mineral
Specular Hematite with Quartz and Limonite
Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)
Mineral
Conglomerate (Pebble Conglomerate)
Conglomerate
sedimentary
Painted River Rock
Anthropogenic-modified Siliciclastic Sedimentary Rock
Sedimentary
Quartz Geode in Sedimentary Host Rock
Silicon Dioxide (SiO2) in Carbonate Matrix
sedimentary
Botryoidal Agate
Silicon Dioxide (SiO2)
mineral
Banded River Cobble with Mafic Dike
Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion
igneous and sedimentary
Quartz Matrix with Iron Staining / Mica Schist
Silicon Dioxide (SiO2) with Iron Oxide staining
mineral
Quartzite River Cobble
Quartzite (SiO2)
metamorphic
Unknown Rock Specimen
igneous
Tumbled Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with Chlorite or Epidote inclusions
Silicon Dioxide (SiO2) with inclusions
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Quartz Vein in Host Rock
Silicon dioxide (SiO2) veining in silicate matrix
sedimentary
Fossiliferous Chert (with Fossil Shells)
Silicon Dioxide (SiO2) with biogenic inclusions
sedimentary
Basalt with Quartz Veining
Basalt (SiO2-rich veins)
igneous
Grass (Organic Matter/Soil)
Poaceae (family of monocotyledonous flowering plants)
Organic Materia (Not a rock or mineral)
Fossilized shell or coral fragment
Indeterminate biogenic carbonate; likely calcite/aragonite (CaCO₃)
fossil
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Quartz-rich conglomeratic sandstone
Lithic arkose/conglomerate, dominated by quartz and feldspar grains
sedimentary
Quartz Vein in Matrix
Silicon Dioxide (SiO2) within Rhyolitic or Granitic Matrix
igneous
Quartz on Sandstone
Silicon Dioxide (SiO2) in Lithic Sandstone
sedimentary
Fossilized Ripple Marks or Stromatolite
Sedimentary ripple mark imprint / Biosedimentary structure
fossil
Weathered greenish rock fragment
Indeterminate; possibly epidote- or chlorite-bearing altered silicate rock
mineral
Quartz Vein in Basalt or Slate
Hydrothermal quartz vein traversing mafic host rock
metamorphic