Uncertain

Polished bloodstone (heliotrope)

Chalcedony, microcrystalline SiO₂, with green coloring and iron-oxide inclusions

Milky quartz with iron-stained mica

Quartz (SiO₂), likely intergrown with muscovite and minor iron oxides

Weathered gray gneiss

Quartz–feldspar–mica gneiss

Fossilized bivalve shell fragment

Calcitic mollusk shell, commonly Bivalvia; exact genus cannot be determined from the image

Fossilized tooth, likely mammoth or mastodon molar fragment

Proboscidean molar enamel and dentin; exact species requires expert examination

Milky quartz

Quartz (SiO₂)

Reddish-brown rounded pebble, likely iron-stained sandstone or chert

Probable quartz-rich sandstone (SiO₂), possibly ferruginous chert; exact identification requires testing

Quartz crystal fragment in weathered host rock

Quartz (SiO₂), possibly in a feldspathic or iron-stained matrix

Faceted yellow-brown gemstone ring

Likely citrine (quartz, SiO₂); the image alone cannot confirm the stone or any treatments.

Polished dark stone, likely basalt or fine-grained mafic rock

Basalt (approximately; commonly plagioclase, pyroxene, and minor olivine/magnetite)

Weathered limestone or calcareous sandstone

Calcite-rich carbonate rock, likely limestone (CaCO₃)

Weathered quartz-rich rock fragment

Indeterminate; likely altered granite or quartz-bearing pegmatite

Rounded granite cobble

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, potassium feldspar, plagioclase, and minor mica or amphibole

Unidentified metallic-looking mineral fragment

Indeterminate; possible galena, magnetite, or metal-rich sulfide/ore fragment

Rounded volcanic pebble, likely andesite or basalt

Fine-grained andesite–basalt; chiefly plagioclase feldspar and pyroxene, with possible iron oxides

Tiger’s-eye (likely a polished or carved tiger’s-eye piece)

Quartz variety with fibrous crocidolite-replacement structure; SiO₂

Rounded quartz-rich river pebble

Feldspathic quartz sandstone or quartzite pebble (exact identification requires testing)

Polished banded agate (likely carnelian agate)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Likely blue-green kyanite

Kyanite, Al₂SiO₅

Botryoidal chalcedony (white agate)

Microcrystalline quartz, SiO₂ (chalcedony)

Polished black stone, likely hematite

Hematite (Fe₂O₃), possibly black jasper or basalt

Red-brown iron-rich rock, likely hematite-bearing basalt or ironstone

Provisional identification: hematite (Fe₂O₃)-stained mafic rock; possibly weathered basalt or ferruginous chert

Tumbled greenstone (likely serpentinite or nephrite)

Serpentinite: Mg-rich serpentine minerals; possible nephrite: tremolite–actinolite amphibole

Weathered granite or granitic gneiss

Felsic granitoid; primarily quartz, feldspar, and mica

Tumbled pale green stone, possibly serpentine or green aventurine

Uncertain from photograph; likely serpentine-group mineral, chiefly antigorite/lizardite, or quartz-bearing aventurine

Chrysoprase-bearing serpentinite (probable)

Serpentinized ultramafic rock; chiefly serpentine-group minerals, with possible chrysoprase (nickel-bearing chalcedony) and magnesite

Fossil-bearing limestone, possibly a crinoid or shell fragment

Calcite (CaCO₃) limestone containing an indeterminate marine fossil

Polished agate/chalcedony fragment

Microcrystalline quartz (SiO₂), likely banded chalcedony or agate

Polished blue-green stone, likely serpentine or chrysocolla-bearing rock

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing

Likely dark green jasper or serpentinite pebble

Undetermined fine-grained rock; possible serpentine-group mineral (approx. Mg₃Si₂O₅(OH)₄) or jasper (microcrystalline SiO₂)

Weathered quartz-rich rock, possibly granite or quartzite

Indeterminate; likely quartz–feldspar aggregate, potentially granitic, or recrystallized quartzite

Tumbled dark green stone, likely serpentine or greenstone

Serpentine-group minerals, chiefly antigorite/lizardite; possibly chlorite-rich greenstone

Fossilized echinoid (sea urchin), likely a regular echinoid

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

Greenstone (likely chlorite-rich metamorphic rock)

Chlorite-bearing greenschist; exact identification requires testing

Polished/tumbled stone, likely mahogany obsidian

Obsidian, natural volcanic glass (composition typically rhyolitic)

Likely bituminous coal

Coal, predominantly carbon-rich organic matter with variable maceral and mineral content

Iron-rich rock, possibly limonite/goethite

Likely goethite (α-FeO(OH)) and/or limonite; exact identification requires testing

Banded fluorite pebble (likely)

Fluorite, CaF₂

Unidentified pale blue-green stone

Not identifiable from this image; possibly amazonite (microcline feldspar)

Polished ocean jasper cabochon

Orbicular jasper (microcrystalline quartz, SiO₂)

Polished peach aventurine or quartz

Likely quartz (SiO₂), possibly feldspar-rich aventurine

Brown chert or jasper fragment

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