Sedimentary Or Igneous Fragment

Unidentified dark-brown rock fragment

Not identifiable from the image; possibly a common mafic rock fragment

Small dark rock fragment (unidentified)

Undetermined; the image is insufficient for reliable mineral or rock identification

Likely quartz-rich granite or granitic rock fragment

Granite, composed mainly of quartz and feldspar with possible mica

Granite

Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica

Orange Calcite

Calcium Carbonate (CaCO3)

Fossiliferous Limestone with Crinoid Stem

Sedimentary Rock with Echinodermata fossil fragment

Milky Quartz

Silicon Dioxide (SiO2)

Greenstone / Metagraywacke

Metamorphosed basaltic or sedimentary rock (Complex Silicate)

Brown sandstone or weathered quartz-rich rock

Likely lithic sandstone; exact identification requires a close fresh surface and tests

Weathered porphyritic volcanic rock (likely andesite or basalt)

Porphyritic andesite/basalt; typically plagioclase feldspar ± pyroxene, olivine, and iron oxides

Weathered granite or granitic gneiss

Granite; primarily quartz, feldspar, and mica (possibly gneiss if the faint banding is structural)

Fossilized Shell Fragment

Bivalvia or Gastropoda (depending on original organism)

Likely raw rose quartz or pink feldspar fragment

Quartz (SiO₂), possibly pink feldspar such as orthoclase

Quartz Pebble (on Granite)

Silicon Dioxide (SiO2)

Clear quartz

Quartz (silicon dioxide, SiO₂)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Rosy/Clear variety)

Silicon Dioxide (SiO2)

Granite

Granite, composed chiefly of quartz, feldspar, and mica

Likely hematite-rich ironstone or metallic mineral fragment

Hematite (Fe₂O₃), possibly with magnetite (Fe₃O₄) or metallic iron

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Small dark mineral or rock fragment

Undetermined; possibly a dark mafic mineral such as biotite or magnetite

Small weathered mineral/rock fragment

Unidentified; likely quartz-rich material, possibly quartzite or feldspar-bearing rock

Fossil shell fragment, likely brachiopod or bivalve

Indeterminate fossilized marine mollusk or brachiopod; mineralized calcite shell in a carbonate matrix

Basalt Fragment

Extrusive Igneous Rock

Small tan weathered stone, likely limestone

Probable calcite-rich limestone (predominantly CaCO₃); identification is tentative from the image

Likely flint (chert) fragment

Microcrystalline quartz (SiO₂), commonly called chert or flint

Likely pink granite or granitic pegmatite fragment

Granite; mainly quartz (SiO₂), feldspar, and mica

Fossiliferous Limestone

Biogenic Sedimentary Rock (CaCO3)

Small iron-oxide-rich rock fragment (possibly ferruginous sandstone)

Ferruginous sandstone or ironstone; likely quartz grains cemented by iron oxides such as hematite/goethite

Likely fossil-bearing limestone fragment

Limestone, chiefly calcite (CaCO₃); exact identification is uncertain from the image

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Weathered quartz-bearing rock fragment

Indeterminate; likely quartz-rich granite or silicified host rock with iron-oxide staining

Uncertain small tan mineral/rock fragment

Indeterminate from image; possibly feldspar-rich rock or calcite

Quartz (White/Milky)

Silicon Dioxide (SiO2)

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Likely milky quartz fragment

Quartz (SiO₂)

Grey River Pebble (Greywacke / Basalt)

Stream-rounded silicate rock pebble

Likely milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate (SiO2 matrix with various silicate clasts)

Calcite

Calcium carbonate (CaCO3)