Dyed Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Category
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Petoskey Stone
Hexagonaria percarinata
sedimentary
Slate
Slate
metamorphic
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
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
Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
sedimentary
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
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
Mica (Biotite or Phlogopite Buchsam)
Silicate Mineral (Phyllosilicate family)
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
Agate Bookend / Quartz Geode
Silicon Dioxide (SiO2)
mineral
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
Pyrite (Polished Palm Stone)
Iron disulfide (FeS2)
mineral
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Kaolinite (China Clay)
Kaolinite (Al2Si2O5(OH)4)
sedimentary
Fossil Coral (Petoskey Stone / Hexagonaria)
Hexagonaria percarinata (Silicified/Calcite Replacement Coral)
fossil
Pyrite
Iron Disulfide (FeS2)
mineral
Polished dendritic agate (likely moss agate)
Microcrystalline quartz, SiO₂, with iron/manganese oxide inclusions
gemstone
Tumbled agate or chalcedony
Microcrystalline quartz, SiO₂
mineral
Tumbled agate/chalcedony pebble
Microcrystalline quartz (SiO₂), likely gray chalcedony with iron-oxide or other mineral inclusions
mineral
Polished orbicular granite (likely gabbroic granite)
Granite, chiefly quartz (SiO₂), feldspar, and biotite/amphibole; exact variety uncertain from the photograph
igneous
Polished banded gneiss pebble
Gneiss, chiefly quartz–feldspar–mica; exact mineralogy uncertain from image
metamorphic
Petoskey Stone (Fossilized Rugose Coral)
Hexagonaria percarinata
fossil
Chalk
Micrite (primarily Calcium Carbonate or CaCO3)
sedimentary
Grey Banded Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral