Mineral, Sediment

Likely pyrite-bearing metamorphic rock

Quartz–mica schist or phyllite with disseminated pyrite (FeS₂)

Concrete-like aggregate surface with embedded rock fragments

Anthropogenic concrete or exposed aggregate; not a natural rock specimen

Fossil fish slab

Fossilized fish remains, likely a laminated shale-hosted vertebrate fossil; exact taxon is indeterminate from the image

Botryoidal calcite (likely calcite concretion)

Calcite, calcium carbonate (CaCO₃)

Jasper

Jasper (Silicate mineral, SiO2)

Sandstone (Red)

Arenite (primarily Quartz, SiO2, with Iron Oxide cement)

Yellow jasper (likely iron-stained chert)

Microcrystalline quartz (SiO₂), chiefly chalcedony/quartz with iron-oxide pigments

Fossilized Crinoid Stem

Class Crinoidea (Echinodermata)

Biotite-rich schist (likely mica schist)

Mica schist; predominantly biotite mica with quartz and feldspar

Weathered sedimentary rock, possibly sandstone

Indeterminate clastic sediment; probable quartz-rich sandstone

Fossil Shark Tooth

Otodus sp. or Carcharocles sp. (likely fossilized Chondrichthyes)

Pebble

Clast (specifically a granule or small pebble)

Dark, mica-rich metamorphic rock (probable schist or gneiss fragment)

Likely biotite–quartz–feldspar schist; exact identification requires testing

Jasper (Green/Yellow Moss Jasper)

Silicon Dioxide (SiO2)

Conical fossil shell or shell fragment

Likely a gastropod shell fragment; exact taxon indeterminate from the image

Chert Nodule

Microcrystalline Quartz (SiO2)

Tumbled dark pebble

Indeterminate; likely basalt or fine-grained dark metamorphic rock

Fossil bivalve shell

Likely a fossilized oyster or other marine bivalve; exact genus is indeterminate from the image

Banded calcite (banded limestone/marble fragment)

Calcite, CaCO₃; likely banded calcitic marble or recrystallized limestone

Red jasper (likely iron-rich chert)

Microcrystalline quartz, SiO₂, colored mainly by hematite/goethite

Fossil gastropod shell

Fossilized gastropod; likely a spiral marine snail, taxonomic identification uncertain from the image

Shale

Shale (Lutite)

Shale

Shale (clay-rich mudstone)

Tumbled jasper, likely mookaite or brecciated jasper

Microcrystalline quartz (SiO₂), with iron-oxide inclusions

Petrified Wood

Petrified Wood (Silicified Wood)

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2)

Fossil scallop/bivalve shell

Fossilized pectinid bivalve; likely family Pectinidae (exact genus/species cannot be determined from the image)

Raw pale-green beryl (likely aquamarine)

Beryl, Be₃Al₂Si₆O₁₈; blue-green variety is aquamarine

Likely garnet crystal fragment

Garnet-group mineral, possibly almandine (Fe₃Al₂(SiO₄)₃)

Rounded quartz-rich cobble, likely weathered granite or gneiss

Granite-derived granitoid; chiefly quartz, feldspar, and minor mica/amphibole

Banded Jasper / Rhyolite (Picture Jasper)

Silicified Rhyolitic Tuff / Microcrystalline Quartz (SiO2)

Shale

Argillaceous Sedimentary Rock

Honey-colored chert or flint fragment

Microcrystalline quartz (SiO₂), likely chalcedony-rich chert

Weathered sandstone or siltstone cobble

Clastic sedimentary rock, probably quartz-rich sandstone; exact identification requires testing

Fossilized Gastropod Shell

Gastropoda (Class) replacement / internal cast (steinkern)

Coarse Sand Grain / Lithic Fragment

Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)

Polished banded jasper (likely red jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides; exact variety uncertain

Sandstone with Trace Fossils

Quartz Arenite with Bioturbation (Trace Fossils)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Quartz Pebble (Iron-stained)

Silicon Dioxide (SiO2)

Quartz-rich mineral fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz