Sedimentary Or Igneous Fragment

Tumbled smoky quartz

Quartz (SiO₂), smoky variety

Chert (Jasper/Common Opal mix)

Microcrystalline Quartz (SiO2)

Basalt with Granite Inclusions (Xenolith)

Mafic Igneous Rock (Basalt) with Felsic Igneous Inclusion (Granite)

Specular Hematite

Hematite (Fe2O3)

Weathered sandstone

Quartz-rich clastic sandstone, commonly arkosic or feldspathic

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Weathered brown rock, likely iron-stained sandstone or chert

Indeterminate; probable quartz-rich sandstone/chert with iron-oxide staining

Rock Crystal Quartz

Quartz (SiO₂)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Red Painted Rock

Artificial Coated Lithic Fragment

Generic Rock / River Pebble

Lithic fragment / Quartzite pebble

River Stone

Water-worn lithic fragment

River Pebble

Water-worn lithic fragment

Crescent Pebble

Weathered Quartzite or Sandstone Fragment

Fossilized Shark Tooth (Partial)

Elasmobranchii (fossil tooth fragment)

Weathered granite (likely biotite granite)

Granite; interlocking quartz, feldspar, and mica, commonly with biotite

Weathered pink granite fragment

Granite, chiefly quartz, potassium feldspar, and plagioclase feldspar with minor mica

Unidentified weathered rock fragment

Likely granitic or feldspathic rock; exact identification requires clearer imaging and testing

Gravel (likely Basalt or Greywacke)

Basalt (Mafic volcanic rock)

Rounded quartz-rich pebble

Likely microcrystalline quartz (SiO₂), possibly milky quartz or a pale quartzite fragment

Biotite-bearing granite or granitic gneiss

Quartz–feldspar–biotite aggregate; likely granite, possibly weathered gneiss

Orange Calcite

Calcium Carbonate (CaCO3)

Smooth river pebble

Indeterminate lithology; likely fine-grained quartz-rich sandstone, siltstone, or weathered chert

Quartz Pebble

Silicon Dioxide (SiO2)

Fossilized Shell in Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Likely weathered granite or granitic pegmatite

Granite; mainly quartz (SiO₂), feldspar, and mica, with possible iron-oxide staining

Porphyritic Basalt (with Olivine or Quartz phenocryst)

Porphyritic Basalt (Mafic Extrusive)

Calcite

Calcium Carbonate (CaCO3)

Conglomerate (pebble-to-cobble gravel)

Polymictic conglomerate; clast-supported conglomerate in a sandy or silty matrix

Sandstone (Micaceous Sandstone)

Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)

Quartz-bearing metamorphic rock, likely garnet-mica schist

Quartz–mica schist with probable garnet and iron-oxide minerals

Tumbled polymict breccia (probable quartz-rich breccia)

Clastic breccia composed mainly of quartz, feldspar, and iron-oxide-stained rock fragments

Weathered quartz-rich stone, possibly fossiliferous limestone

Indeterminate; likely calcite-rich limestone (CaCO₃) or weathered quartz-bearing rock

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Raw Garnet Fragment

Nesosilicate Group (e.g., Almandine, Fe3Al2(SiO4)3)

Siltstone

Siltstone (composed of mixed silicate minerals and clay)

Oolitic Chert

Oolitic Microcrystalline Quartz (SiO2)

Quartz (Milky/Clear)

Silicon Dioxide (SiO2)

Likely flint or chert fragment

Microcrystalline quartz (SiO₂), probably flint/chert

Gray Limestone Fragment

Limestone (CaCO3)

Weathered basaltic rock fragment

Basalt, likely porphyritic or amygdaloidal basalt with weathered iron-oxide-rich zones

Weathered granitic boulder

Granite to granodiorite; quartz–feldspar–biotite rock