Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Category
Not A Natural Rock (Man Made Composite)
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Quartzite Pebble
Quartzite
metamorphic
Granite Cobble / Gneiss (River Rock)
Granitic Gneiss / Felsic Igneous Rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Hag Stone
Perforated sedimentary rock (typically sandstone or limestone)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (SiO2 principal component)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite
sedimentary
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Yellow Quartz (Citrine Quartz or Yellow Jasper)
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone (Ferruginous)
Arenite (with Hematite/Limonite cement)
sedimentary
Coquina (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Quartzite Pebble
Metamorphic Quartz-rich Rock
metamorphic
Pumice
Volcanic glass / Pumiceous rock
igneous
Fossilized Coral (Petoskey Stone / Hexagonaria)
Hexagonaria percarinata / Rugosa coral (CaCO3)
fossil
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Sandstone
Arenite
sedimentary
Granite
Phaneritic Igneous Rock (Granite)
igneous
Smoky Quartz with Chert
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt
igneous
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Tumbled Stone
Silicon dioxide / Various silicates
mineral
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone (Ferruginous / River-worn Cobble)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Shale with Quartz Veins
Fissile Sedimentary Rock (SiO2)
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Fossil Coral and Quartz Pebble
Fossilized Anthozoa / Silicon Dioxide (Quartz)
sedimentary
Black Beach Pebble / Basalt Pebble
Basalt / Mafic Volcanic Rock
igneous
Amethyst Geode
Silicon Dioxide (SiO2) with iron impurities
mineral
Granite
Granite; predominantly quartz, potassium feldspar, plagioclase, and biotite/hornblende
igneous
Chert Concretion (Flint)
Silicon Dioxide (SiO2)
sedimentary
Mixed tumbled gemstone collection
Varied minerals, likely including amethyst, sodalite/lapis lazuli, quartzite or aventurine, jasper, and agate/chalcedony
gemstone
Smoky Quartz
Silicon Dioxide (SiO2) with natural radiation treatment
mineral
Decomposed Granite
Grano-diorite/Granite-residuum (SiO2 primary)
igneous