Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Biotite Schist
Biotite Schist
Metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Ferruginous Sandstone (Ironstone)
Ferruginous arenite
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Man-made earbud charging case (Not a rock or mineral)
Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components
Synthetic/Man-made object
Quartz Mica Schist
Mica-Quartz Schist (Chemical: SiO2 + KAl2(AlSi3O10)(OH)2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone
Arenite (primarily Quartz Sandstone)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Red Sandstone
Sandstone (Iron Oxide Rich)
sedimentary
Rhodonite
Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)
sedimentary
Chert (Yellow Jasper/Quartzite Pebble)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Garnet Schist
Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)
metamorphic
Chert (specifically Flint or Novaculite variant)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Vesicular Basalt
Basalt (Mafic volcanic rock)
igneous
Red Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Chert (Yellow Jasper variant)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Diamond
Diamond (C)
mineral
Red Sandstone Pebble
Arenite with iron oxide (Hematite)
sedimentary
Chert (varietal Flint)
Microcrystalline quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood / Fossilized Wood (SiO2)
sedimentary
Black Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Sandstone with Hematite staining
Arenite with Fe2O3 inclusions
sedimentary
Chert (Chalk-associated Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Limestone
Calcareous Sedimentary Rock (CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Small pale mineral fragment
Unidentified; possibly quartz, calcite, or feldspar
mineral
Quartzite (Gold/Tan River Cobble)
Quartzite (composed primarily of crystalline SiO2)
metamorphic
Moissanite
Silicon Carbide (SiC)
mineral
Red Sandstone (Iron-rich Sandstone)
Clastic Sedimentary Rock - Quartz Arenite / Arkose with Hematite Cement
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral