Likely quartz-rich metamorphic rock (quartzite or milky quartz)
Quartzite; predominantly quartz (SiO₂), possibly with feldspar and iron-oxide staining
metamorphic
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Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Basalt
Extrusive Igneous Basalt
igneous
Basalt River Stone
Basalt
igneous
Vesicular Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Polished brecciated jasper
Jasper, microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions
gemstone
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Anthropogenic (Man-made)
Red Jasper
Silicon dioxide (SiO2) with iron oxide (Fe2O3) inclusions
sedimentary/mineral
Sandstone
Arenite
sedimentary
Sandstone Pebble
Arenite (primarily Quartz, SiO2)
sedimentary
Thunderegg (specifically a Jasper/Agate-filled Geode nodule)
Silicon Dioxide (SiO2) within Rhyolitic Matrix
igneous
Basalt
Mafic Extrusive Igneous Rock
igneous
Weathered iron-rich sandstone or laterite fragment
Ferruginous sandstone, chiefly quartz (SiO₂) cemented or stained by iron oxides/hydroxides
sedimentary
Porphyritic Rhyolite
Porphyritic Rhyolite (Felsic volcanic rock)
igneous
Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Breccia
Breccia (Sedimentary Clastic Rock)
sedimentary
Scoria (Lava Rock)
Scoria (basaltic pyroclastic rock)
igneous
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Puddingstone (Conglomerate)
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone (with Iron Staining)
Arenite
sedimentary
Sandstone (Fossiliferous)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Terrazzo (Man-made Composite)
Cementitious or Resin-bound Lithic Composite
sedimentary (artificial)
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Sandstone
Arenite
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Biotite (Black Mica)
Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)
mineral
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary