Organic (Paper And Cellulose)

Sandstone (likely Quartzose)

Sandstone (Principally SiO2)

Muscovite Mica (in Quartz matrix)

Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)

Slate

Foliated metamorphic rock

Slate

Slate (Foliated metamorphic rock consisting mainly of quartz and muscovite or illite)

Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Marble

Recrystallized Calcite (CaCO3) / Marble

Banded Agate (Dyed Purple)

Agate (Variety of Chalcedony/Quartz), SiO2

White Marble

Recrystallized Calcite (CaCO3)

Septarian Nodule

Septarian concretion (Complex mixture of Siderite, Calcite, and Aragonite)

Banded Sandstone (Zebra Stone)

Arenite with Iron Oxide Banding (Liesegang rings)

Yellow Banded Agate

Silicon Dioxide (SiO₂)

Bauxite

Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)

Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx')

Calcium Carbonate (CaCO3)

Red Sandstone

Arenite (Ferruginous Sandstone)

Diorite

Phaneritic intermediate plutonic rock

Sandstone (Ferruginous)

Arenite with Iron Oxide (Limonite/Hematite) coating

Sandstone (Wonderstone)

Arenite (composed primarily of SiO2 with Fe2O3 impurities)

Banded Sandstone

Arenite with Liesegang banding (primarily SiO2 with FeO(OH) impurities)

Marble

Metamorphosed Limestone (principally CaCO3)

Banded Gneiss

Gneiss (quartz-feldspar-biotite metamorphic rock)

Puddingstone (Conglomerate)

Conglomerate (clastic sedimentary rock)

Pumice (Vesicular Rhyolite/Andesite)

Pumice (a highly vesicular volcanic glass/extrusive igneous rock)

Muscovite Schist

Muscovite (KAl2(AlSi3O10)(OH)2) in Schist

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)

Jasper (specifically Owyhee or Picture Jasper variety)

Jasper (Silicon Dioxide, SiO2)

Chalk

Calcium Carbonate (CaCO3)

Fossil Rugose Coral (Horn Coral)

Order Rugosa (likely Grewingkia or Heliophyllum species); Calcium Carbonate (CaCO3)

Sandstone with Quartz Vein

Arenite with Quartz (SiO2) Infilling

Puddingstone

Conglomerate (typically quartz-rich or jasper-rich)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Muscovite Mica

Muscovite: KAl2(AlSi3O10)(OH)2

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Marble

Recrystallized Calcite (CaCO3)

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Orthoceras Fossil Limestone

Orthoceras (extinct genus of cephalopod); Limestone matrix (CaCO3)

Chalcedony Nodule (Carnelian/Agate)

Chalcedony (Silicon Dioxide, SiO2)

Limestone

Calcium Carbonate (CaCO3)

Thunderegg (Agetized Geode nodule)

Rhyolitic Agate Nodule (SiO2 filling volcanic cavities)

Limestone with Calcite Crystals

Calcium Carbonate (CaCO3)

Slate

Foliated Metamorphic Rock (primarily composed of quartz, illite, chlorite, and micas)

Pyrite

Iron Sulfide (FeS2)