Uncertain

Tumbled chalcedony (likely common quartz/jasper)

Microcrystalline quartz, SiO₂

Weathered quartz-rich rock, possibly quartzite

Quartzite (mostly SiO₂), though the photograph is insufficient for confident identification

Weathered mica-rich schist

Mica schist, likely muscovite–quartz schist

Small rounded quartz-rich pebble, possibly quartzite

Quartzite (tentative); chiefly quartz, SiO₂

Brown chert (possible flint)

Microcrystalline quartz, SiO₂; chert

Polished obsidian (likely snowflake obsidian)

Volcanic glass, predominantly silica-rich rhyolite; snowflake obsidian contains cristobalite spherulites

Polished red-and-white jasper

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

Small tumbled jasper or agate pebble

Likely microcrystalline quartz (SiO₂), possibly jasper or chalcedony

Likely flint (dark chert)

Microcrystalline quartz (SiO₂), commonly called chert or flint

Fossiliferous limestone

Bioclastic limestone, composed mainly of calcite (CaCO₃) and visible fossil fragments

Green fluorite (tentative identification)

Fluorite, CaF₂

Likely amethyst crystal fragment

Quartz, SiO₂; purple coloration from iron-related defects and irradiation

Mixed polished and tumbled mineral specimens, prominently amethyst

Amethyst: purple quartz, SiO₂; accompanying pieces may include jasper, agate, aventurine, tiger’s eye, and other lapidary stones

Polished greenstone (likely serpentine or nephrite-like material)

Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (actinolite–tremolite amphibole)

Quartz-rich rock, likely chert or chalcedony

Microcrystalline silica (SiO₂), possibly quartz/chalcedony

Weathered quartz-rich rock, likely quartzite or silicified limestone

Quartzite (mostly SiO₂), possibly calcareous quartzite with residual calcite

Native gold nugget (probable)

Native gold, Au; possibly gold-bearing ironstone or quartz matrix

Likely galena (lead sulfide)

Galena, PbS

Likely quartzite

Quartzite, composed predominantly of quartz (SiO₂)

Green fluorite (likely rough fragment)

Fluorite, CaF₂

Polished agate (chalcedony nodule)

Microcrystalline quartz, SiO₂; agate is banded chalcedony, with possible iron-oxide inclusions

Tumbled quartz-rich rock, possibly calcite or sandstone

Indeterminate from photograph; likely microcrystalline quartz (SiO₂) or calcite (CaCO₃)

Polished yellow chalcedony pendant (possibly yellow agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Green aventurine (polished stone carving)

Quartz, SiO₂, with green fuchsite mica inclusions (aventurescent quartz)

Granite (likely weathered)

Granite, a quartz–feldspar–mica intrusive igneous rock

Tumbled carnelian (likely)

Carnelian, a reddish-orange variety of chalcedony; microcrystalline quartz (SiO₂)

Tiger’s-eye (likely rough chatoyant quartz)

Quartz, SiO₂, with fibrous pseudomorphic alteration of crocidolite (often called tiger’s-eye)

Peach moonstone (polished/tumbled feldspar)

Orthoclase feldspar, KAlSi₃O₈ (possibly with albite intergrowths)

Milky quartz (rough quartz-rich rock)

Quartz, silicon dioxide (SiO₂); likely massive milky quartz, possibly quartzite

Dark metamorphic pebble, likely slate or phyllite

Slate/phyllite; chiefly fine-grained mica and quartz, with possible chlorite and graphite

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or feldspar

Rounded limestone pebble

Calcite-rich limestone (CaCO₃)

White quartz-rich pebble, possibly milky quartz

Milky quartz (SiO₂), with possible feldspar or calcite inclusions

Granite fragment (likely)

Granite; primarily quartz (SiO₂), feldspar, and mica

Milky quartz (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Dark coarse-grained igneous rock, likely gabbro or diabase

Gabbro–diabase; chiefly plagioclase feldspar and pyroxene, with possible olivine and opaque iron-titanium oxides

Granite pebble

Granite, chiefly quartz, feldspar, and mica

Weathered granite (likely biotite granite)

Granite; interlocking quartz, feldspar, and mica, commonly with biotite

Tumbled greenish stone, likely altered basalt or serpentinite

Probable basaltic/mafic rock with secondary chlorite, epidote, or serpentine minerals

Orange calcite (likely rough specimen)

Calcite, calcium carbonate (CaCO₃)

Weathered granite or granitic pebble

Granite; chiefly quartz, alkali feldspar, plagioclase, and minor mica/amphibole

Uncertain: likely hematite-stained quartzite or iron-rich metamorphic rock

Quartz-rich, iron-oxide-stained rock; exact identification requires testing