Mineral, Specifically A Rock Fragment

Likely weathered iron-rich rock fragment

Probably limonite/goethite-bearing material; exact identification requires testing

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Fossiliferous Rock (Invertebrate Fossil in Matrix)

Fossiliferous limestone or shaly matrix containing skeletal fossil remains

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Polished agate fragment

Chalcedony (microcrystalline quartz, SiO₂), likely brecciated or banded agate

Red Sandstone

Clastic Sandstone (typically Quartz-rich with Iron Oxide)

Small quartz-rich rock fragment (tentative)

Quartz, silicon dioxide (SiO₂), possibly in a feldspar-bearing granite fragment

Chert (specifically Chalcedony/Flint variant)

Silicon Dioxide (SiO2)

Jasper (Yellow Jasper)

Silicon Dioxide (SiO2) with iron inclusions

Breccia

Breccia (Clastic Sedimentary Rock)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Oyster shell fragment

Ostreidae shell; primarily calcite (CaCO₃)

Likely slate or fine-grained metamorphic rock

Slate; predominantly microcrystalline quartz, mica, and clay minerals

Milky Quartz

Silicon Dioxide (SiO2)

Fossiliferous Limestone (Crinoidal Limestone)

Calcium Carbonate with Crinoid Stem Fossils (CaCO3)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Blue Quartz (or Blue Aventurine)

Silicon Dioxide (SiO2) with inclusions (typically Crocidolite or Dumortierite)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Likely sandstone or weathered quartz-rich rock fragment

Quartz-rich sandstone; exact identification is uncertain from the photograph

Sandstone

Sedimentary Rock (Quartz Sandstone)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered iron-rich rock, possibly laterite or limonite-bearing sandstone

Iron oxides/hydroxides, chiefly limonite/goethite (FeO(OH)·nH₂O), with a probable silicate or clay matrix

Serpentine

(Mg,Fe)3Si2O5(OH)4

Breccia

Breccia - Clastic sedimentary rock

Fossilized Bone Fragment

Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)

Basalt Fragment

Extrusive Igneous Rock

Yellow-brown quartz/chalcedony fragment

Quartz, SiO₂; likely microcrystalline chalcedony with iron-oxide staining

Blue Quartz

Silicon Dioxide (SiO2) with inclusions

Greenstone / Epidosite

Metamorphosed Mafic Igneous Rock (Epidote-Chlorite group)

Breccia

Breccia (Sedimentary Clastic Rock)

Sandstone

Arenite

Feldspar-rich igneous rock, likely granite or gneiss fragment

Granite-like quartz–feldspar rock; exact identification is uncertain from the blurred image

Blue Lace Agate

Silicon dioxide (SiO2) - Chalcedony variety

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Kimberlite

Ultramafic igneous rock

Moldavite

Moldavite (Silica-rich glass, SiO2 + Al2O3)

Weathered granite or granitic gneiss fragment

Granite; chiefly quartz, alkali feldspar, plagioclase, and minor mica/iron oxides

Waterworn Pebble / Quartzite

Metamorphic/Sedimentary rock fragment

Pink Granite

Granite (Phaneritic Acidic Igneous Rock)

Weathered iron-rich rock fragment

Likely limonite/goethite-rich ironstone; exact identification requires testing