Sandstone with Quartz/Calcite druse
Arenite with druse (SiO2 or CaCO3)
sedimentary
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Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Polished stone sphere, possibly agate or jasper
Likely microcrystalline quartz (SiO₂); exact variety cannot be confirmed from the image
mineral
Thunder Egg (Agate Core)
Cryptocrystalline Quartz (SiO2) in Rhyolite/Perlite Matrix
mineral
Kaolinite (China Clay / Chalky Claystone)
Al2Si2O5(OH)4
mineral
Fossilized Coral (Petoskey Stone type)
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Dyed Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Petoskey Stone
Hexagonaria percarinata
sedimentary
Molybdenite in Quartz
Molybdenite (MoS2) with Quartz (SiO2)
mineral
Sandstone
Arenite
sedimentary
Hematitic Sandstone
Sandstone with Hematite inclusions (SiO2 + Fe2O3)
sedimentary
Sandstone
Arenite (primarily Quartz chemical formula SiO2)
sedimentary
Slate
Slate
metamorphic
Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
sedimentary
Pet Rock (Quartzite/Sandstone River Rock)
Silicon Dioxide (SiO2) mixture
sedimentary
Fossilized Coral (Petoskey Stone / Hexagonaria)
Hexagonaria percarinata / Rugosa coral
fossil
Carved Sea Turtle Figurine (Aventurine / Quartz / Jasper)
Quartz variety (SiO2) / Polycrystalline Quartz Aggregate
mineral
Quartz-filled Basalt Geode
Amygdaloidal Basalt with Quartz (SiO2)
igneous
Cream Marble (Speckled)
Metamorphosed Limestone (mainly CaCO3)
metamorphic
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Rounded granitic pebble
Likely granite or granodiorite; exact identification is limited by the image
igneous
Fossilized Coral (Petoskey Stone type)
Hexagonaria percarinata (Order: Rugosa)
sedimentary
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Polished quartz geode slice
Quartz (SiO₂), likely chalcedony-lined geode with drusy quartz crystals
mineral
Sandstone (likely Arkosic or Ferruginous)
Arenite (SiO2 with iron oxides or feldspar)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Mica (Muscovite)
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Mica (Biotite or Phlogopite Buchsam)
Silicate Mineral (Phyllosilicate family)
mineral
Agate Bookend / Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (Lithic Arenite)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Graphite
Graphite (C)
mineral
Ferruginous Sandstone
Arenite with limonite/goethite cement
sedimentary
Gypsum Wallboard (Drywall)
Hydrous calcium sulfate (CaSO4·2H2O)
sedimentary (processed mineral product)
Ferruginous Sandstone
Arenite with Iron-Oxide Cement
sedimentary
Petoskey Stone
Hexagonaria percarinata
fossil
Polished agate/chalcedony slab
Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide inclusions
gemstone
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Petoskey Stone
Hexagonaria percarinata
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary