Mineral, Sediment

Weathered fossiliferous limestone pebble (possible fossil fragment)

Calcite-rich limestone, primarily CaCO₃; the visible lines may be calcite-filled fractures

Tumbled brown pebble

Indeterminate; possibly weathered basalt or iron-stained quartzite

Fossil shell

Likely a fossilized marine bivalve shell; exact taxon is indeterminate from the image.

Banded Chert

Microcrystalline Quartz (SiO2)

Iron Concretion

Ferruginous concretion (Fe2O3·nH2O / FeO(OH))

Leopard Jasper

Microcrystalline Quartz (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Weathered, iron-stained pebble

Likely ferruginous sandstone or iron-oxide-cemented rock; exact identification requires examination

Weathered quartz-rich pebble

Likely quartzite or silicified rock with iron-oxide staining; chiefly SiO₂

Quartz-rich pebble, possibly milky quartz or quartzite

Quartz (SiO₂), potentially metamorphic quartzite

Jasper (specifically Owyhee or Picture Jasper variety)

Jasper (Silicon Dioxide, SiO2)

Sandstone (Graywacke)

Clastic Sedimentary Rock (Lithic Sandstone)

Dark brown river-worn stone (rock type indeterminate)

Unidentified fine-grained rock; the photograph does not show diagnostic features for a reliable species-level identification.

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Fossil-bearing limestone

Calcite-rich limestone (mainly CaCO₃), with a possible shell fossil

White quartz pebble

Quartz (SiO₂), likely massive milky quartz

Milky quartz fragment

Quartz, silicon dioxide (SiO₂)

Small quartz-rich stone, possibly milky quartz or quartz-bearing rock

Quartz (SiO₂), identification uncertain from image

Iron-rich jasper (likely rough jasper/chert)

Microcrystalline quartz (SiO₂), colored by iron oxides

Pitted Limestone

Calcium Carbonate (CaCO3)

Rounded pebble, likely fine-grained river stone

Unidentified lithic pebble; composition cannot be determined from the image

Milky quartz

Quartz (silicon dioxide, SiO₂)

Shark Tooth Fossil

Chondrichthyes (class) fossilized tooth

Fossilized bivalve shell

Calcitic or aragonitic mollusk shell, commonly Bivalvia; exact species indeterminate

Banded Chert

Chert (Microcrystalline Quartz, SiO2)

Quartz-rich granite pebble

Granite, composed mainly of quartz, feldspar, and mica

Water and Silt (Sedimentary Environment)

Suspended Sediment / H2O (dihydrogen monoxide)

Fossiliferous limestone pebble

Calcite-rich limestone, CaCO₃, with possible fossil or shell fragments

Banded Sedimentary Rock

Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands

Glauconitic Sandstone (Greensand)

Glauconitic Sandstone (Iron-potassium phyllosilicate mineral: (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Bumblebee Jasper (technically Bumblebee Stone)

Calcite, Aragonite, and Realgar/Orpiment mixture (SiO2 + CaCO3 + As2S3/As2S2)

Layered sandstone (likely building stone)

Quartz-rich sandstone; exact variety cannot be determined from the image

Quartz-rich pebble, likely milky quartz

Quartz (silicon dioxide, SiO₂), possibly with iron-oxide or feldspar impurities

Quartz fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Dark, weathered rock fragment (possibly basalt or iron-rich stone)

Indeterminate; possible basalt (plagioclase–pyroxene rock)

Unidentified smooth stones

Undetermined from the image; the specimens may be water-worn pebbles of different compositions.

Heart-shaped Quartz

Silicon Dioxide (SiO2)

Iron-rich rock fragment (possibly ironstone or limonite/goethite)

Likely ironstone composed largely of goethite/limonite; image alone cannot confirm

Sandstone (Water-worn)

Arenite

Small quartz fragment, possibly milky quartz

Quartz (SiO₂)

Fossil gastropod (snail)

Fossilized gastropod shell, likely a marine mollusk; exact genus cannot be determined from the image

Ironstone Concretion

Ferruginous Siltstone/Ironstone (Fe2O3)