Sandstone
Quartz Arenite
sedimentary
Category
Not A Natural Rock
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Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Quartz pebble (Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive igneous rock
igneous
Weathered river pebble (likely iron-stained rock)
Indeterminate from the image; possibly iron-oxide-stained quartzite or sandstone
sedimentary
Porphyritic volcanic rock (likely porphyritic andesite)
Porphyritic andesite; exact identification requires examination of a fresh surface
igneous
Conglomerate
Clastic Sedimentary Rock
sedimentary
Quartz Geode with Calcite/Siderite
Crystalline Silicon Dioxide (SiO2) with Carbonate inclusions
mineral
Small rough mineral/rock fragment
Unidentified; image detail is insufficient for a reliable species identification
mineral
Small rock fragment, possibly granite or another mica-bearing silicate rock
Unidentified fine-grained silicate rock; mineral species cannot be confirmed from the image
igneous
Tumbled dark-green stone, possibly jade or serpentine
Undetermined; candidates include jadeite (NaAlSi₂O₆), nephrite (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂), or serpentine-group minerals
mineral
Unidentified small mineral fragments
Likely quartz- or feldspar-rich material; species cannot be determined reliably from the image
mineral
Basalt (Vesicular)
Vesicular Basalt
igneous
Turquoise-colored ring stone (possibly turquoise or imitation)
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; identity cannot be confirmed from the image
gemstone
Shale
Laminated Fissile Pelite
sedimentary
Quartzite Pebble
Quartzite
metamorphic
Rounded gray river cobble, likely quartz-rich sandstone or weathered granite
Indeterminate; possible granitic or feldspathic cobble (quartz–feldspar–mica aggregate)
igneous
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Hag stone
Perforated sedimentary rock (typically flint, chert, or limestone)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
River Pebble
Polymictic rock fragment
sedimentary
Granite
Intrusive Igneous Rock
igneous
Black Obsidian
Volcanic Glass (Silica glass with magnetite/hematite microcrystals)
igneous
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Red bead-and-chain costume jewelry, likely glass or plastic
No geological identification; the red beads appear manufactured and cannot be identified as mineral from the image
mineral
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Shale with Iron Staining
Fissile Argillaceous Sedimentary Rock
sedimentary
Porphyritic Basalt or Porphyritic Andesite Pebble
Extrusive Igneous Rock
igneous
Shale or Mudstone
Argillaceous sedimentary rock
sedimentary
Travertine
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2, silica)
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Unidentified pale mineral or rock surface
Indeterminate from image; possibly a small quartz or feldspar grain
mineral
Iron-rich breccia or weathered ironstone
Goethite–hematite-bearing limonite, possibly with quartz and altered rock fragments
igneous
Opalite (Synthetic Moonstone/Sea Opal)
Silicon Dioxide (SiO2) glass with metallic inclusions
Synthetic/Man-made Glass
Shale
Argillite / Shale
sedimentary
Tumbled stones, likely jasper or agate
Likely microcrystalline quartz (SiO₂), varieties such as jasper or agate; exact identification is not possible from the image
mineral
Fossil Coral and Quartz Pebble
Fossilized Anthozoa / Silicon Dioxide (Quartz)
sedimentary
Granite
Felsic intrusive igneous rock
igneous