Industrial Byproduct (Anthropogenic Rock Like Material)

Jasper

Silicon Dioxide (SiO2)

Chert / Microcrystalline Quartz

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Quartzite River Stone

Quartzite (SiO2)

Sandstone (Quartzose)

Arenite (SiO2 based)

Vesicular Basalt

Vesicular Basalt

Basalt

Basalt (Mafic volcanic rock)

Basalt

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Basalt River Stone

Basalt (Aphanitic Mafic Igneous Rock)

Biotite (Mica)

K(Mg,Fe)3AlSi3O10(OH,F)2

Chert / Flint

Silicon Dioxide (SiO2)

Marble

Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)

Basalt with vesicles

Vesicular Basalt

Pegmatite (Granitic) with Tourmaline

Granitic Pegmatite (containing Schorl and Quartz)

Native Copper (in coinage alloy)

Copper (Cu)

Gneiss

Gneiss (a rock type, not a specific mineral with a formula)

Apatite

Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))

Piddock-bored Mudstone

Lutite (Siltstone or Mudstone) with Pholad borings

Basalt

Basalt (Mafic volcanic rock)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Petrified Wood (Silicified Fossil)

Silicified Wood (SiO2)

Chert (often called Flint when found in chalk)

Microcrystalline Quartz (SiO2)

Sandstone Cobble

Arenite (Secondary classification based on grain size)

Silicon

Silicon (Si)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Limestone

Calcium Carbonate (CaCO3)

Pegmatite

Granitic Pegmatite

Shale

Fissile mudrock (composed of clay-sized particles and detrital grains)

Basalt

Mafic Igneous Rock

Chert

Siliceous sedimentary rock (predominantly microcrystalline quartz, SiO2)

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Sandstone (Stream-rounded Cobble)

Arenite (composed primarily of SiO2, Silica)

Fluorite (likely Green Fluorite variant)

Calcium Fluoride (CaF2)

Biotite (Black Mica)

Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2

Marble

Recrystallized Calcite (CaCO3)

Granite

Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2 with minor Fe2O3)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Chert (often called Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Agate (specifically a Yellow/Honey Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz