Agate (translucent pebble)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Category
Sedimentary (Man Made)
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Sandstone with Dendritic Inclusions
Quartzose Sandstone
sedimentary
Crushed Limestone
Sedimentary Calcite/Dolomite Rock (CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite/Quartz Arenite
sedimentary
Porphyritic Basalt (likely artificially dyed or altered)
Basalt with plagioclase phenocrysts (likely treated)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Chert / Flint (with Jasper inclusions)
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Chert (Green variety)
Silicon Dioxide (SiO2)
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Basalt
Fine-grained mafic volcanic rock, chiefly plagioclase feldspar, pyroxene, and commonly olivine
igneous
Granite
Intrusive Phaneritic Felsic Igneous Rock
igneous
Basalt
Basalt
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (with Patina)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Iron Formation (BIF) / Iron Ore
Banded Iron Formation (composed primarily of Hematite (Fe2O3) and Magnetite (Fe3O4) with Quartz/Chert)
sedimentary
Red Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Seashell Fossil
Mollusca (Bivalvia)
fossil
Fossilized Coral
Rugose Coral / Hexagonaria (Fossilized calcium carbonate)
fossil
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Quartzite (River Stone)
Quartzite (mainly SiO2 with iron oxide staining)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Red Jasper (possibly Carnelian)
Silicon Dioxide (SiO2) with Hematite impurities
mineral
Ironstone pebble
Ironstone (Ferruginous Sedimentary Rock)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Fluorite (Blue)
Calcium Fluoride (CaF2)
mineral
Jasper
Silicon Dioxide (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Ironstone Concretion
Limonitic/Hematitic Concretion
sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide impurities), formula: SiO2
mineral