Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Category
Sedimentary (Secondary Classification For A Weathered Mineral Specimen)
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Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Quartzite)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Basalt with Weathering Rind
Mafic Volcanic Rock (Primarily Plagioclase and Pyroxene)
igneous
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone Cobble
Arenite (primarily Quartz Arenite)
sedimentary
Sandstone (Water-worn Pebble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
Igneous
Fossilized Shark Tooth
Carcharocles sp. (likely Lemon or Sand Tiger)
sedimentary
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Grey variety)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Barite Rose on Marcasite
Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Jasper
Jasper (Silica/Quartz) - SiO2
mineral
Almandine Garnet in Matrix
Almandine Garnet (Fe3Al2(SiO4)3)
metamorphic
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
River Sandstone (Lithic Arenite)
Lithic Sandstone (SiO2 dominated with lithic fragments)
sedimentary
Jasper (likely Brecciated or Multi-colored)
Jasper (SiO2)
sedimentary
Diorite
Phaneritic Intermediate Igneous Rock
igneous
Iron Meteorite
Iron-Nickel Alloy (Kamacite and Taenite)
mineral
Chert (Grey Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Fairburn Agate / Agate-bearing Breccia
Cryptocrystalline Quartz (SiO2) within Jasper/Breccia matrix
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-bearing Clastic Sedimentary Rock)
sedimentary
Botryoidal Lace Agate
Agate (Silicon Dioxide, SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Diamond (Cut Gemstones in Jewelry)
Carbon (C)
gemstone
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Sandstone (with Iron concretions/staining)
Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)
sedimentary
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Chert with Quartz Vein
Microcrystalline Quartz (SiO2) with Macrocrystalline Quartz
sedimentary
Chalcedony (Agate/Common Opal blend)
Microcrystalline Quartz (SiO2)
mineral
Orange Calcite (with White Calcite/Quartz matrix)
Calcium Carbonate (CaCO3)
mineral
Geode (Unopened)
Siliceous Septarian Concretion / Geode (SiO2)
sedimentary
Amethyst Geode
Silicon Dioxide with trace inclusions of Iron (SiO2)
mineral