Organic (Paper And Cellulose)

Porphyritic Diabase (Porphyry)

Porphyritic Diabase / Microgabbro

Polished/tumbled brown jasper or brecciated jasper

Microcrystalline quartz (SiO₂), commonly including hematite, iron oxides, and assorted silicified fragments

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(F,OH)2

Biotite-bearing metamorphic rock, likely schist

Mica schist; chiefly quartz, feldspar, and biotite mica

Calcite

Calcium Carbonate (CaCO3)

Muscovite Mica

Muscovite: KAl2(AlSi3O10)(OH)2

Graphite-bearing schist (probable graphite ore)

Graphite (C) in graphitic schist; identification is visual and uncertain

Pink Granite

Phaneritic Plutonic Rock (Felsic)

Pink Granite

Phaneritic intrusive igneous rock (high Orthoclase Feldspar content)

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Tumbled white quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Pyrite

Iron Sulfide (FeS2)

Diorite

Diorite (intermediate intrusive igneous rock)

Banded Agate

Cryptocrystalline Quartz (SiO2)

Calcite

Calcium Carbonate (CaCO3)

Rounded river cobble, likely weathered sandstone or quartz-rich metasandstone

Indeterminate sandstone; commonly quartz (SiO₂) with feldspar, lithic grains, and iron-oxide cement

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Tumbled black stone, likely basalt or black jasper

Basalt (fine-grained plagioclase–pyroxene rock), possibly opaque microcrystalline quartz/jasper

Talc

Talc (Hydrated magnesium silicate, Mg3Si4O10(OH)2)

Polished gray pebble, likely quartzite or fine-grained granite

Probable quartzite (mostly microcrystalline SiO₂); identification is uncertain from the photograph

Jasper (specifically Owyhee or Picture Jasper variety)

Jasper (Silicon Dioxide, SiO2)

Chalk

Calcium Carbonate (CaCO3)

Faceted glass-like gemstone object

Likely synthetic glass or cubic zirconia; exact material cannot be confirmed from the image

Tumbled basalt or dark volcanic rock

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides

Polished brown stone, possibly jasper or chert

Indeterminate microcrystalline quartz (SiO₂), likely jasper/chert

Rounded granitic cobble

Granite or granitic gneiss; primarily quartz, feldspar, and mica

Puddingstone

Conglomerate (typically quartz-rich or jasper-rich)

Fossil Rugose Coral (Horn Coral)

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

Petoskey Stone

Hexagonaria percarinata

Puddingstone (Quartzite Conglomerate with Jasper inclusions)

Metaconglomerate (Silicon Dioxide, SiO2)

Polished agate geode

Chalcedony (microcrystalline quartz, SiO₂) with quartz druse crystals

Ironstone Concretion

Siderite or Hematite Concretion (FeCO3 or Fe2O3)

Banded iron formation (BIF)

Banded iron formation; chiefly hematite/magnetite and microcrystalline quartz (chert)

Polished fossiliferous limestone

Bioclastic limestone, commonly called fossil limestone or marble-like limestone

Polished dark stone, likely basalt or black jasper

Basalt (fine-grained plagioclase–pyroxene rock), possibly iron-rich jasper/chert

Likely tumbled yellow-orange mineral or glassy stone

Indeterminate from photograph; possibilities include yellow jasper, calcite, agate, or dyed quartz

Kaolinite (clay mineral)

Kaolinite, Al₂Si₂O₅(OH)₄

Polished fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Tumbled brown stone, likely jasper or fine-grained quartzite

Uncertain; probable microcrystalline quartz (SiO₂), possibly ferruginous jasper