Quartz pebble
Silicon dioxide (SiO2)
mineral
Category
Sedimentary (Anthropogenic)
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Clear Quartz
SiO2 (Silicon Dioxide)
gemstone
Pink Quartz
Silicon Dioxide (Quartz), SiO2
mineral
Mica
Mica group (often Muscovite or Biotite)
mineral
Polished Stone Pendant (Identity Unclear)
Unknown (Possibly Jasper/Agate/Quartz mixture)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Brachiopod Fossil in Matrix
Phylum Brachiopoda
fossil
Worn River Pebble with Fossil Indentation
Sedimentary Rock with Fossil Infill
sedimentary
Moqui Marble (Shaman Stone)
Iron Oxide Concretion (Goethite/Hematite shell with Sandstone core)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Chert (Beach Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Polished hematite
Hematite (Fe₂O₃), likely a tumbled specimen
mineral
Pyrite Cubes in Matrix
Iron Disulfide (FeS2) in Host Matrix
mineral side rock
Quartz Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Polished red jasper (likely hematite-bearing jasper)
Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides such as hematite/goethite
mineral
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Satin Spar (Selenite)
Gypsum (CaSO4·2H2O)
mineral
Red Jasper
Microcrystalline Quartz (SiO2 with Iron Oxide impurities)
sedimentary
Jasper (Mookaite / Brecciated Jasper)
Microcrystalline Quartz (SiO2 with iron oxide inclusions)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Hematite (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Botryoidal Pyrite
Iron Sulfide (FeS2)
mineral
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
sedimentary
Polished black limestone or chert pebble
Cryptocrystalline silica (chert) or calcitic limestone; exact identification is uncertain from the photograph
sedimentary
Sandstone
Sandstone (Arenite)
sedimentary
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Selenite / Gypsum
Gypsum (CaSO4·2H2O)
Mineral
Chert Nodules in Sedimentary Rock
Microcrystalline Quartz (SiO2) within Clastic Matrix
sedimentary
Polished brown flint/chert nodule
Microcrystalline quartz (SiO₂), commonly called flint or chert
sedimentary
Chert with Limestone
Microcrystalline Quartz (SiO2) in Calcium Carbonate (CaCO3) matrix
sedimentary
Shale with Quartz Vein
Argillaceous Shale with Silicon Dioxide Vein
sedimentary
Fossiliferous Limestone with Brachiopod
Phylum Brachiopoda in Sedimentary Matrix (CaCO3)
fossil
Coquina / Fossiliferous Limestone
Fossiliferous Limestone / CaCO3
sedimentary
River Stone (Sedimentary Sandstone/Quartzite)
Arenite/Quartzite transition specimen
sedimentary