Sedimentary Or Igneous Fragment

Fossilized Echinoid Fragment (Calycinal/Boss Fossil)

Echinodermata fossil fragment

Weathered fossiliferous limestone

Calcitic limestone; predominantly CaCO₃, possibly containing a fossil mold or shell fragment

Gneiss (Granitic Gneiss)

Gneiss

Conglomerate

Polymictic Conglomerate

Tumbled river pebble, likely fine-grained sandstone or mudstone

Indeterminate lithic clast; possibly quartz-rich sandstone or siltstone

Likely calcite or quartz fragment

Uncertain from image; calcite (CaCO₃) is the leading possibility, with quartz (SiO₂) another possibility

Chert

Microcrystalline or cryptocrystalline quartz (SiO2)

Sandstone Concretion

Ferruginous Sandstone Concretion

Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Fossiliferous Shale

Fossiliferous Mudstone / Shale

Likely sandstone

Quartz-rich sandstone (indeterminate variety)

Labradorite rough fragment

(Ca,Na)[Al,Si]A̲₁O₈

Quartz Pebble

Silicon Dioxide (SiO2)

Seashell Fragment

Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite

Shale and Pebble Fragment

Sedimentary Rock (Mudstone/Shale with Silica Pebble)

Agate (Fortification Agate)

Banded Chalcedony (SiO2)

Likely weathered sandstone or iron-rich sedimentary fragment

Uncertain; probable quartz-rich sandstone with iron-oxide cement

Quartzite (or Chert/Flint gravel)

Quartzite (SiO2 with iron oxide inclusions)

Fossilized Shark Tooth (Fragment)

Elasmobranchii gen. et sp. indet.

Granite (weathered fragment)

Granite; chiefly quartz, alkali feldspar, plagioclase, and mica

Small dark rock fragment

Indeterminate; possibly basalt or scoria

Red Jasper (Opaque Chalcedony)

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Weathered granitic rock (likely granite or granodiorite)

Granite–granodiorite; chiefly quartz, feldspar, and mica

Likely weathered quartz-bearing rock fragment

Indeterminate granitic or quartz-rich silicate rock; chiefly quartz (SiO₂), possibly feldspar

Fossil coral fragment

Likely fossilized colonial coral; exact taxon cannot be determined from the fragment

Weathered sandstone fragment

Sandstone, primarily quartz (SiO₂) with feldspar and iron-oxide cement

Breccia Pebble

Sedimentary Breccia

Small dark rock fragment (unidentified)

Undetermined; the image does not show enough detail for reliable identification.

Likely weathered sandstone or iron-stained limestone fragment

Indeterminate clastic carbonate/siliciclastic rock; likely quartz-rich sandstone or porous limestone with iron-oxide staining

Quartz fragment

Quartz, silicon dioxide (SiO₂)

Weathered granite fragment

Granite, chiefly quartz, alkali feldspar, plagioclase, and mica

Likely weathered sandstone fragment

Quartz-rich sandstone, predominantly SiO₂ with minor feldspar and iron-oxide cement

Shale fragment

Shale (Laminated Mudstone)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with marine fossils

Likely milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Unidentified translucent mineral fragment, possibly quartz

Likely quartz (SiO₂), though the photograph is insufficient for confident identification

Small quartz-rich rock fragment

Likely quartz-bearing granite, pegmatite, or quartzite; exact identification is uncertain from the photograph

Small polished or naturally worn stone, possibly quartz-bearing rock

Indeterminate from the blurred image; likely quartz (SiO₂) or a pale feldspar-rich fragment

Milky quartz

Quartz, silicon dioxide (SiO₂)

Small rounded rock (likely granite or gneiss)

Unidentified coarse-grained silicate rock; likely granitic composition

Fossilized Bone Fragment

Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)

Milky quartz (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)