Uncertain

Fossilized echinoid (sea urchin), likely a regular echinoid

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

Tumbled quartz-rich stone, possibly smoky quartz or chert

Uncertain; likely microcrystalline quartz, SiO₂

Weathered vesicular volcanic rock (likely pumice or altered basalt)

Vesicular basalt–pumice, compositionally uncertain

Small rounded pebble (likely quartz or quartz-rich stone)

Uncertain; possibly microcrystalline quartz (SiO₂)

Weathered sandstone fragment

Quartz-rich sandstone (compositionally uncertain)

Opal-bearing rock (possible common opal in host rock)

Hydrated amorphous silica, SiO₂·nH₂O, occurring in a pale host rock

Likely quartz-bearing rock fragment

Quartz (SiO₂), identification uncertain from the small, blurred specimen

Rounded quartz-rich river pebble

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

Likely scoria (vesicular basalt)

Scoria, typically basaltic; composed mainly of plagioclase, pyroxene, and sometimes olivine

White banded calcite

Calcite (CaCO₃)

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

Translucent jade bangle

Likely jadeite (NaAlSi₂O₆) or nephrite (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); the image alone cannot distinguish them.

Mica-rich schist

Muscovite–biotite schist, with quartz and feldspar

Clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Black tourmaline (schorl) pendant

Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Tumbled jasper (likely yellow/brown jasper)

Microcrystalline quartz, SiO₂, colored by iron oxides and other impurities

Weathered quartz-rich rock, likely vein quartz

Mostly silicon dioxide (SiO₂); exact rock type cannot be confirmed from the photograph

Likely petrified wood

Silicified fossil wood, chiefly quartz (SiO₂)

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

Fossil tooth, possibly a shark tooth

Unidentified fossilized vertebrate tooth; species cannot be determined from the image

Likely milky quartz

Quartz (SiO₂)

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

Likely muscovite mica

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂

Small rough quartz crystal or quartz fragment

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Quartzite

Quartzite, composed predominantly of quartz (SiO₂)

Weathered sedimentary rock (likely sandstone)

Quartz-rich sandstone; exact identification requires a close-up or tests

Polished smoky quartz

Quartz (SiO₂), smoky variety

Polished ocean jasper cabochon

Orbicular jasper (microcrystalline quartz, SiO₂)

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