Mineral, Sediment

Banded iron formation (ironstone)

Banded iron formation; chiefly hematite/magnetite (Fe₂O₃/Fe₃O₄) with chert (SiO₂)

Fossil Coral

Scleractinia (Fossilized Hexacoral)

Fossil oyster shell

Fossilized bivalve shell, likely Ostrea or Crassostrea species; primarily calcite (CaCO₃)

Fossil gastropod shell

Fossilized or mineral-replaced gastropod (class Gastropoda), exact genus indeterminate

Ammonite fossil

Fossilized ammonoid cephalopod; likely an indeterminate Jurassic–Cretaceous ammonite

Ironstone concretion

Siderite or Limonite-rich Concretion (FeO(OH)·nH2O)

Ironstone Concretion

Ironstone (Limonite/Goethite Concretion)

Banded Siltstone

Siltstone with rhythmic bedding

Rounded ironstone or weathered basalt pebble

Likely basaltic rock, possibly iron-rich concretion; exact identification requires testing

Sandstone (Greywacke)

Arenite / Lithic Wacke (SiO2 predominant)

Banded sandstone pebble

Lithic or quartz-rich sandstone; exact composition requires testing

Polished ammonite fossil

Ammonoidea (likely a Jurassic or Cretaceous ammonite), preserved in limestone/mudstone

Concretion (Sandstone)

Carbonate-cemented Sandstone Concretion

Petrified Wood

Silicified wood (Quartz, SiO2)

Sandstone

Arenite (mostly Quartz-based)

Jasper Pebble

Microcrystalline Quartz (SiO2)

Mica-rich metamorphic rock, likely schist

Biotite–muscovite schist, possibly garnet-bearing

Likely quartz-rich metamorphic rock (quartzite or quartz-veined schist)

Quartzite/siliceous schist; chiefly quartz (SiO₂), with probable mica and iron-oxide staining

Foliated quartz-mica schist

Quartz–muscovite/biotite schist, commonly with feldspar

Yellow jasper pebble (likely iron-stained chert)

Microcrystalline quartz (SiO₂), colored by iron oxides/hydroxides

Fossil scallop shell

Scallop (family Pectinidae); shell composed chiefly of calcite and/or aragonite (CaCO₃)

Fossilized echinoid (sea urchin), likely a regular echinoid

Echinodermata; class Echinoidea, calcitic stereom preserved as calcite (CaCO₃)

Red-gray metamorphic pebble, likely jasper-bearing quartzite

Ferruginous quartzite/jasper; predominantly microcrystalline SiO₂ with iron oxides

Fossil Turtle Shell

Testudines carapace fossil

Polished jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

Red jasper pebble

Jasper, opaque microcrystalline quartz (SiO₂), colored mainly by iron oxides

Tumbled red-brown stone, likely jasper

Jasper, microcrystalline quartz (SiO₂), probably iron-oxide-bearing chert

Tumbled jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

Red Jasper

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Small rounded pebble, likely quartz-rich stone

Indeterminate from photograph; possibly microcrystalline quartz (SiO₂) or a weathered silicate pebble

Quartz Grain

Silicon Dioxide (SiO2)

Yellow jasper or iron-stained chert

Microcrystalline quartz (SiO₂), commonly colored by goethite/limonite and other iron oxides

Tumbled brown-and-cream stone, likely jasper or chert

Microcrystalline quartz (SiO₂), probably jasper/chert; exact identification requires testing

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and dark matrix inclusions

Likely galena-bearing ore or graphite-rich sulfide fragment

Indeterminate; possibly galena (PbS) with quartz, or graphite-rich schist

White quartz pebble (probable)

Quartz, silicon dioxide (SiO₂)

Tumbled quartz-rich pebble

Likely quartz-bearing chert or jasper; primarily microcrystalline SiO₂

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), likely jasper/chalcedony

Milky quartz fragments

Quartz, silicon dioxide (SiO₂)

Likely iron-stained chert or chalcedony pebble

Microcrystalline quartz (SiO₂), possibly ferruginous chert

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), likely iron-stained jasper/chalcedony

Weathered quartz-rich pebble, possibly iron-stained chalcedony

Microcrystalline quartz (SiO₂), likely chalcedony with iron-oxide staining