Sedimentary Or Mineral

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Quartz

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Yellow Calcite

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Weathered iron-rich sandstone or siltstone

Clastic siliciclastic sedimentary rock, likely ferruginous sandstone/siltstone (quartz-rich, Fe-oxide cement)

Common Pebble / Sedimentary Rock Fragment

Lithified clastic sediment

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Weathered quartz-rich pebble

Likely quartz aggregate, SiO₂, possibly quartzite or silicified rock

Jasper

Jasper (Silicon Dioxide, SiO2)

Vein-filled Sedimentary Rock

Silicified sedimentary rock with quartz/calcite vein

Sandstone

Sedimentary quartz arenite

Conglomeratic Sandstone

Clastic Sedimentary Rock

Bivalve Fossil (Shell-bearing Sedimentary Rock)

Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix

Conglomerate

Sedimentary Conglomerate

Sandstone

Sandstone (SiO2 dominated)

Limonite Sandstone

Ferruginous Sandstone (Hydrated Iron Oxide)

Sandstone

Arenite (lithic or quartz sandstone)

Shale with Iron Staining

Fissile Argillaceous Sedimentary Rock

Weathered sedimentary rock, possibly sandstone

Indeterminate clastic sediment; probable quartz-rich sandstone

Blue Apatite

Ca5(PO4)3(F,Cl,OH)

Jasper and Chalcedony Composite

Silicon Dioxide (SiO2) microcrystalline quartz

Jasper and Chalcedony

Silicon Dioxide (SiO2) microcrystalline quartz

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Fossil Snail

Gastropoda (fossilized)

Weathered sandstone or quartz-rich sedimentary rock

Likely quartz arenite/subarkose; predominantly quartz (SiO₂) with feldspar and iron-oxide cement

Limestone with Fossil Fragment

Sedimentary carbonate rock (CaCO3)

Glauconite (Greensand)

Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2

Rounded gneiss pebble

Banded gneiss; commonly quartz–feldspar–mica gneiss

Flint

SiO2 (Microcrystalline Quartz / Chert)

Sedimentary River Rock

Siliciclastic Sedimentary Rock (Quartzite or Sandstone pebble)

Sandstone

Quartz Arenite / Clastic Sedimentary Rock

Sandstone (with Iron Oxide)

Quartz Arenite / Ferruginous Sandstone (SiO2 with Fe2O3)

Jasper

Microcrystalline Quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Ironstone concretion (likely limonite/goethite-rich)

Iron-oxide-cemented sediment, commonly goethite (FeO(OH)) and/or limonite

Tumbled brown stone, possibly jasper or weathered chert

Uncertain; likely microcrystalline quartz (SiO₂), potentially iron-stained jasper/chert

Raw Fluorite

Calcium Fluoride (CaF2)

Tumbled Agate

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 principal)