Uncertain

Granite

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

Yellow chalcedony (likely tumbled)

Microcrystalline quartz, SiO₂; possibly yellow jasper or calcite

Quartz geode nodule (possibly chalcedony)

Silica, SiO₂; quartz or microcrystalline quartz (chalcedony)

Quartz-rich mineral specimen, possibly druzy quartz

Quartz (SiO₂), possibly with carbonate or feldspar matrix

Likely serpentinite or chlorite-rich metamorphic rock

Serpentinite, commonly dominated by serpentine-group minerals (antigorite/lizardite/chrysotile), possibly with magnetite and chlorite

Tumbled dark green stone, likely serpentine or greenstone

Serpentinite (serpentine-group minerals), possibly chlorite- or amphibole-rich greenstone

Tumbled pink-and-white feldspar-rich stone

Likely perthitic alkali feldspar (microcline/orthoclase), possibly from granite or pegmatite

Mica schist (likely biotite-rich schist)

Mica schist, dominated by biotite mica (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂), with possible quartz and feldspar

Quartz-rich pegmatitic rock, possibly milky quartz with mica

Pegmatite dominated by quartz (SiO₂), with probable muscovite mica and feldspar

Tumbled agate or chalcedony pebble

Microcrystalline quartz (SiO₂), likely agate/chalcedony

Weathered quartz-rich sandstone

Quartz arenite (likely ferruginous sandstone)

Weathered granite fragment

Granite, primarily quartz, feldspar, and mica

Polished labradorite-bearing rock

Labradorite, a calcium-rich plagioclase feldspar; likely mixed with quartz and mafic minerals

Dark mafic rock, likely altered basalt or gabbro

Fine- to medium-grained mafic silicate rock; probable basaltic composition with plagioclase and pyroxene, possibly chloritized/serpentinized

Selenite (gypsum)

Gypsum, CaSO₄·2H₂O; transparent or translucent variety commonly called selenite

Likely weathered granite or granitic gneiss fragment

Granite: quartz + feldspar + mica; possibly gneiss if foliation is confirmed

Coarse-grained granite or granitic gneiss

Granite; primarily quartz (SiO₂), feldspar, and mica, possibly metamorphosed to gneiss

Likely rose quartz-bearing pegmatite

Quartz (SiO₂), probably with feldspar and iron-oxide staining

Polished orbicular jasper or rhyolitic jasper

Silica-rich microcrystalline quartz/chalcedony (SiO₂), likely jasper with contrasting mineral veins

Rough emerald specimens

Beryl, Be₃Al₂Si₆O₁₈, colored green by chromium and/or vanadium

Weathered sandstone or iron-stained quartzite

Quartz-rich sandstone (SiO₂-dominated), possibly metamorphosed to quartzite

Polished reddish banded jasper

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

Tumbled quartz bead bracelet

Quartz (SiO₂), likely milky or rose quartz

Brown agate or chalcedony cabochon pendant

Microcrystalline quartz (SiO₂), likely brown chalcedony/agate

Tumbled feldspar-rich stone, likely granite or granitic pegmatite

Quartz–feldspar aggregate; likely alkali feldspar and plagioclase with minor quartz, possibly altered

Fossil fish slab

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

Chert or silicified limestone (uncertain)

Microcrystalline quartz (SiO₂), possibly calcitic limestone (CaCO₃)

Carved jade pendant

Likely nephrite jade, a calcium-magnesium amphibole; exact identity cannot be confirmed from the image

Carved jade pendant

Likely jadeite (NaAlSi₂O₆) or nephrite (a tremolite–actinolite amphibole); the image alone cannot distinguish them.

Diamond-encrusted microphone-shaped pendant

Diamond (natural or synthetic) set in gold-colored metal; exact stones and metal cannot be confirmed visually

Polished orbicular jasper (likely ocean jasper)

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and other silicate inclusions

Tumbled brown stone, likely chert or jasper

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

Likely blue-green kyanite crystal

Kyanite, Al₂SiO₅

Likely polished tiger’s-eye with dark matrix

Quartz (SiO₂) with fibrous crocidolite-derived inclusions; possibly an iron-rich jasper or other dark host rock

Granite (likely)

Coarse-grained felsic intrusive igneous rock, principally quartz and feldspar with dark mica or amphibole

Tumbled magnetite (likely)

Magnetite, Fe₃O₄

Iron-stained jasper (likely rough jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides

Quartz vein in host rock

Milky quartz (SiO₂), likely in a metamorphic host such as schist or gneiss

Tumbled quartz (likely milky or included quartz)

Quartz, silicon dioxide (SiO₂)

Probable tumbled garnet

Garnet-group silicate, commonly almandine (Fe₃Al₂Si₃O₁₂)

Smoky quartz (likely faceted cabochon or rough fragment)

Quartz, silicon dioxide (SiO₂), smoky variety colored by irradiation-related defects

Polished dendritic agate or jasper cabochon

Microcrystalline quartz, SiO₂, likely chalcedony with iron/manganese oxide inclusions