Uncertain

Milky quartz with possible mica or feldspar inclusions

Quartz (SiO₂), likely with minor inclusions

Likely rough garnet-bearing metamorphic rock

Garnet schist or garnet amphibolite; reddish areas may be almandine garnet (Fe₃Al₂Si₃O₁₂)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), with possible feldspar, mica, and iron-oxide staining

Weathered granite or granodiorite boulder

Granite–granodiorite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende

Weathered limestone fragment

Limestone, predominantly calcite (CaCO₃)

Polished serpentine-rich stone (likely serpentine jasper or “rainforest jasper”)

Serpentine-group minerals, chiefly antigorite/lizardite, with iron oxides and silica-rich rock matrix

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and mica

Weathered porphyritic volcanic rock (likely basaltic andesite)

Porphyritic basaltic andesite; mineral assemblage likely plagioclase, pyroxene, and iron oxides

Likely weathered mica schist fragment

Mica schist, chiefly muscovite/biotite mica with quartz and feldspar

Rounded river pebble, likely weathered quartzite or sandstone

Quartzite (mostly SiO₂), possibly ferruginous sandstone

Slate

Slate; fine-grained metamorphic rock composed mainly of clay minerals, mica, and quartz

Polished copper-bearing rock, likely cuprite-rich copper ore

Cuprite (Cu₂O) with native copper and iron-oxide matrix, probable

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

Quartz-rich gneiss

Banded quartz–feldspar–mica gneiss

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

Small native-gold specimen (possible gold-bearing rock)

Native gold, Au; exact identification cannot be confirmed from the image

Yellow chalcedony (likely tumbled)

Microcrystalline quartz, SiO₂; possibly yellow jasper or calcite

Purple quartz-bearing rock, likely amethyst-bearing quartzite or pegmatitic quartz

Quartz (SiO₂), with iron-related purple coloration; possible feldspar and mica impurities

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

Likely petrified wood or silicified fossil fragment

Silicified wood; predominantly microcrystalline quartz (SiO₂)

Quartz–feldspar pegmatite

Granitic pegmatite, chiefly quartz (SiO₂), feldspar, and mica

Porphyritic granite

Porphyritic granitoid, composed mainly of quartz and feldspar with dark mica or amphibole