Not A Rock (Man Made Origin)

Pumice

Pumice (extrusive volcanic rock)

Granite Cobble

Granite (Phaneritic Igneous Rock)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Apache Tears (Obsidian)

Volcanic Glass (SiO2 - Silicon Dioxide with impurities)

Sandstone

Arenite (composed primarily of SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Chert (specifically a weathered Chert nodule or fragment)

Chert; Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Jasper-Agate Conglomerate (Potentially Puddingstone)

Jasper-cemented Silicate Aggregate (SiO2)

Granite Cobble

Plutonic Granite

Red Jasper

Jasper (Silicate mineral - SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt

Ferruginous Sandstone (Gerrit)

Arenite with Iron Oxide cementation

Granitic Pegmatite

Granite Pegmatite (coarse-grained intrusive igneous rock)

Chert / Jasper

Sedimentary Cryptocrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

Grey River Pebble (Likely Quartz-rich or Limestone)

Clastic Sedimentary Rock (typically SiO2 or CaCO3 based)

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Apache Tear

Obsidian (Hydrated Silica Rich Volcanic Glass)

Apache Tear

Obsidian (Hydrated Volcanic Glass) - SiO2 (with impurities)

Iron-stained Quartzite

Quartzite with Limonite/Hematite staining (SiO2 with FeO(OH)·nH2O)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Hematite/Limonite) inclusions

Ironstone (likely siderite or goethite-rich siltstone)

Ferruginous Siltstone

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Geode (Unopened)

Silica-rich concretion (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron impurities

Scoria

Vesicular Basalt / Scoria

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble

Recrystallized Quartz (SiO2)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Serpentine

Serpentine Group (primarily Antigorite or Lizardite), Mg3Si2O5(OH)4

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Limonite inclusions

Amygdaloidal Basalt

Amygdaloidal Basalt (with secondary mineral infilling)

Conglomerate

Conglomerate (clastic sedimentary rock)

Sedimentary Breccia

Breccia (Clastic Sedimentary Rock)

Granite

Felsic Plutonic Rock (primarily SiO2, Al2O3, K2O, Na2O)

Granitoid (Granite/Gneiss)

Granitoid silicate rock, primarily quartz and feldspar

Sandstone

Arenite (SiO2 principal)

Quartzite River Rock

Metamorphic Quartzite (primarily SiO2)

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Sandstone

Arenite (composed primarily of SiO2)