Sedimentary Or Igneous Fragment

Likely weathered quartz-bearing rock fragment

Provisional identification: quartz-rich sandstone or microcrystalline quartz (SiO₂)

Unidentified yellow-orange mineral fragment

Possibly iron-stained quartz, calcite, or citrine; identification is uncertain from the image

Basalt Pebble

Extrusive igneous rock

Small brown pebble or possible shell fragment

Unidentified natural clast; the image is too small and blurred for reliable identification

Basalt with Granite Inclusions (Xenolith)

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

Granite (likely weathered or altered granite)

Granitic rock, composed mainly of quartz, feldspar, and mica; exact identification is uncertain from the photo.

Weathered granite (probable)

Granite, a quartz–feldspar intrusive igneous rock

Small rock fragment, possibly granite or another mica-bearing silicate rock

Unidentified fine-grained silicate rock; mineral species cannot be confirmed from the image

Orange calcite

Calcite (CaCO₃)

Rounded quartz-rich pebble

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

Likely limestone or weathered shell-rich limestone

Calcite-rich carbonate rock, chiefly calcium carbonate (CaCO₃); exact identification is uncertain from the image

Dark igneous rock fragment, likely basalt

Basalt; commonly composed of plagioclase, pyroxene, and minor olivine or magnetite

Coquina / Shelly Sandstone

Calcareous Sandstone / Coquina

Milky quartz fragment

Quartz (SiO₂)

Banded Chert / Cryptocrystalline Quartz

Silicon Dioxide (SiO2)

Weathered mafic rock fragment

Likely basalt or volcanic breccia; identification is uncertain from the photograph

Sandstone-based Concrete Fragment

Cementitious Composite with Sedimentary Aggregate

Banded Sandstone (Water-worn Pebble)

Arenite with mineral banding

Granite fragment

Granite (Felsic intrusive igneous rock)

Milky quartz

Quartz (SiO₂), likely massive or vein quartz

Granite fragment

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

Granite fragment

Granite, composed mainly of quartz, potassium feldspar, plagioclase, and mica

Chert or silicified sedimentary fragment (tentative)

Microcrystalline quartz (SiO₂), possibly silicified limestone or fossil-bearing chert

Likely chert (flint) fragment

Microcrystalline quartz, SiO₂

Quartz / Limestone Gravel Pebble

Calcite (CaCO3) or Quartz (SiO2) aggregate

Fossilized Bone Chunk (likely Dinosaur or Large Mammal)

Permineralized Fossil Bone

Possible fossilized bone fragment

Indeterminate vertebrate bone; no taxonomic identification is possible from the image alone

Small rounded mineral pebble, possibly quartz

Uncertain; likely microcrystalline or crystalline SiO₂ (quartz), potentially with iron-oxide staining

Likely weathered quartz or feldspar grain

Uncertain; possibly quartz (SiO₂) or a feldspar mineral

Polished brecciated jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with angular fragments cemented by silica or iron oxides

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Small brown chert (flint) fragment

Microcrystalline quartz, SiO₂

Polished black-and-gold brecciated stone, likely sheen obsidian or brecciated jasper

Probable volcanic glass (obsidian), SiO₂, with iron-oxide or rhyolitic inclusions; exact identification is uncertain from the photograph

White/green translucent tumbled mineral fragment

Likely calcite (CaCO₃), possibly fluorite (CaF₂) or glass-like feldspar; visual identification is uncertain

Small weathered rock fragment

Indeterminate; possibly carbonate-rich sandstone or limestone

Small tan rock fragment

Indeterminate; possibly quartz-rich sandstone or iron-stained quartz

Fossiliferous Limestone

Calcium carbonate (CaCO3) with fossil inclusions

Milky quartz (likely)

Quartz, SiO₂

Likely white quartz or feldspar fragment

Unidentified pale mineral; quartz (SiO₂) or feldspar are possibilities

Granite fragment

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

Granite fragment

Granite, chiefly quartz (SiO₂), feldspar, and mica