Uncertain

Tumbled blue-gray stone, likely basalt or slate

Probable fine-grained basalt; exact identification is uncertain from the photograph

Tumbled cream-colored stone, possibly calcite or quartz

Uncertain from image; likely calcite (CaCO₃) or milky quartz (SiO₂)

Unidentified weathered stone, likely quartz-rich metamorphic rock

Possibly quartzite or vein quartz; exact identification is uncertain from the image

Light-colored rounded stone, possibly quartzite or limestone

Uncertain; likely quartzite (quartz, SiO₂) or calcitic limestone (calcite, CaCO₃)

Likely epidote-bearing rock or weathered chalcopyrite specimen

Epidote-group mineral, possibly with chalcopyrite; identification uncertain from image

Chert or siliceous limestone fragments

Microcrystalline quartz (chert) and/or calcarenite; exact identification is uncertain from the photograph

Weathered quartz-rich river cobble

Likely granitic or quartzitic rock; exact identification is uncertain from the photograph

Tumbled pale limestone or calcite-rich stone

Limestone, chiefly calcite (CaCO₃); exact identification is uncertain from the photograph

Quartz-bearing rock, possibly weathered granite or pegmatite

Quartz–feldspar–mica aggregate; exact classification is uncertain from the image

Polished white chalcedony or quartz pendant

Microcrystalline quartz (chalcedony), SiO₂; exact identification is uncertain from the image

Rounded brown pebble, likely weathered basalt or lateritic rock

Probable fine-grained basalt; exact identification uncertain from the photograph

Likely iron-stained quartz or feldspar fragment

Quartz (SiO₂) or potassium feldspar (KAlSi₃O₈), uncertain from image

Silver-gray metallic ore, possibly galena-bearing rock

Likely galena (PbS) in a host rock, but identification is uncertain from the photograph

Green glassy mineral specimen, likely chromium-bearing fluorite (tentative)

Fluorite, CaF₂, possibly green fluorite; identification uncertain from image

Rounded gray river pebble

Likely weathered granite or granodiorite; exact identification is uncertain from the photograph

Weathered gray river cobble

Likely granitic or volcanic rock; exact identification is uncertain from the photograph

Carved red jasper bead (likely ceramic imitation)

Jasper, microcrystalline quartz (SiO₂); exact material uncertain from the image

Tumbled amber-colored mineral or glassy pebble

Uncertain; likely chalcedony/quartz, possibly resinous amber or slag glass

Quartz-rich feldspathic rock, possibly weathered granite or quartzite

Likely quartz and feldspar aggregate; exact identification is uncertain from the photograph

Polished dark agate or jasper specimen

Cryptocrystalline quartz (chalcedony), SiO₂; exact identification is uncertain from the image

Likely gray sandstone or fine-grained metamorphic rock

Quartz-rich lithic sandstone; exact identification is uncertain from the photograph

Weathered quartz-rich stone (likely chert or quartzite)

Quartzite or microcrystalline quartz (SiO₂); exact identification is uncertain from the image

Purple chalcedony or lavender quartz

Cryptocrystalline quartz, SiO₂ (likely chalcedony; identification uncertain from photograph)

Weathered quartz-bearing metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica rock; exact classification is uncertain from the photograph

Likely basalt or vesicular volcanic rock

Basalt, possibly scoriaceous basalt; exact identification is uncertain from the photograph

Unidentified coarse-grained rock fragments

Likely granite or granitic rock; exact identification is uncertain from the photograph

Likely tumbled dark volcanic rock

Probably basalt or basaltic andesite; exact identification is uncertain from the image

Polished banded agate slab or agate-look decorative stone

Microcrystalline quartz (chalcedony), SiO₂; exact identification is uncertain from the image

Weathered sandstone or iron-stained sedimentary rock

Likely quartz-rich sandstone; exact identification is uncertain from the photograph

Quartz cluster, possibly druzy quartz on matrix

Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain

Likely foliated metamorphic rock, possibly schist

Mica schist or micaceous quartzite; exact identification is uncertain from the photograph

Possible weathered granite or gneiss

Feldspar–quartz–mica rock; exact identification is uncertain from the photograph

Likely metallic mineral specimen

Probably galena (lead sulfide, PbS), though visual identification is uncertain

Weathered quartz-rich rock, possibly pegmatite or quartzite

Quartz (SiO₂)-rich aggregate; exact identification is uncertain from the photograph

Likely weathered gray-green stone, possibly serpentinite

Serpentinite (predominantly serpentine-group minerals; identification uncertain from image)

Weathered granite or granitic rock fragment

Granite; chiefly quartz, feldspar, and mica (composition uncertain from image)

Quartz-rich sandstone or granitic fragment

Likely quartz–feldspar sandstone; exact identification is uncertain from the photograph

Likely iron meteorite

Iron–nickel meteorite, commonly octahedrite (kamacite–taenite)

Tumbled dark-green stone, possibly bloodstone (green jasper)

Likely chalcedony (microcrystalline SiO₂); exact identification is uncertain from the photograph

Polished dark stone slab, possibly black marble

Likely calcite marble (recrystallized CaCO₃); identification is uncertain from the image

Dark gray fine-grained rock, possibly slate

Slate (fine-grained metamorphosed mudstone; identification uncertain from image)

Tumbled dark stone, possibly river pebble or hematite

Uncertain; candidates include hematite (Fe₂O₃), basalt, or dark chert