Uncertain

Possible basalt or basaltic volcanic rock

Basalt; typically plagioclase feldspar, pyroxene, and olivine

Iron meteorite fragment (likely weathered meteorite)

Fe–Ni metal, commonly kamacite with taenite; possible stony-iron or iron-oxide fusion crust

Greenstone / serpentinized ultramafic rock

Serpentinite, chiefly serpentine-group minerals (chrysotile, lizardite, antigorite), commonly with magnetite and minor chlorite or pyroxene

Likely iron-rich sandstone or ironstone

Ferruginous sandstone/ironstone; exact identification is uncertain from the photograph

Weathered river pebble (likely iron-stained quartzite)

Quartz-rich quartzite; exact identification is uncertain from the photo

Pale green stone, possibly serpentine

Serpentinite (dominantly serpentine-group minerals; visual identification is uncertain)

Dark river pebble, likely basalt

Fine-grained basalt (probable; identification from image is uncertain)

Quartz-rich rock, possibly milky quartz

Quartz (SiO₂); exact specimen identification is uncertain from the photograph

Likely raw gold-bearing rock or native gold specimen

Possibly native gold (Au); identification is uncertain from the image

Quartz crystal cluster

Quartz (SiO₂), likely iron-stained; exact variety uncertain

Blue-green glassy mineral specimen, likely turquoise-colored fluorite or dyed material

Uncertain; possible fluorite (CaF₂), chrysocolla, or dyed calcite/glass

Tumbled dark stone, possibly hematite or polished basalt

Uncertain; likely hematite (Fe₂O₃) or a polished mafic rock

Black tumbled stone, possibly obsidian

Obsidian (volcanic glass), likely; identification uncertain from the image

Blue glass-like cabochon, likely dyed or synthetic material

Uncertain; possibly dyed chalcedony, synthetic spinel, or blue glass

Vesicular volcanic rock, likely scoria

Scoria (vesicular basalt/andesite; composition uncertain from image)

Likely weathered quartz-rich rock fragments

Uncertain; visually consistent with massive quartz or quartz-bearing sandstone

Rounded volcanic cobble, possibly basalt

Basaltic volcanic rock; exact identification is uncertain from the photograph

Small weathered quartz-rich rock, possibly granite or feldspar-bearing stone

Uncertain; likely quartz–feldspar aggregate, potentially granitic rock

Iron-stained quartz-rich rock, possibly jasper or altered quartzite

Uncertain; likely microcrystalline quartz (SiO₂) with iron oxides/hydroxides

Likely quartz-rich stone or shell fragment

Uncertain; possibly quartz (SiO₂) or a calcareous shell fragment (CaCO₃)

Green-speckled igneous rock, likely epidote-bearing basalt or serpentinite

Tentatively epidote-bearing basalt (compositionally uncertain from the image)

Yellow chalcedony (likely tumbled citrine or yellow jasper)

Microcrystalline quartz, SiO₂; exact variety is uncertain from the image

Weathered quartz-rich metamorphic rock, possibly quartzite or vein quartz

Quartzite / massive quartz (SiO₂), identification uncertain from photograph

Weathered sandstone or iron-rich sedimentary rock

Likely ferruginous sandstone; exact identification is uncertain from the photograph

Likely tumbled amber or honey-colored quartz

Uncertain; possible amber (fossilized resin) or citrine quartz (SiO₂)

Polished brown agate or jasper

Microcrystalline quartz, SiO₂ (chalcedony variety; exact identification uncertain)

Small faceted diamond-like gemstones

Likely diamond (crystalline carbon, C), but visual identification is uncertain

Likely graphite-rich ore or galena-bearing rock

Graphite (C) or galena (PbS), identification uncertain from photograph

Likely tumbled yellow calcite or quartz

Uncertain; possibly calcite (CaCO₃) or iron-stained quartz (SiO₂)

Tumbled golden-brown stone, likely sandstone or weathered iron-rich quartzite

Probable ferruginous sandstone; exact identification is uncertain from the image

Likely black cabochon gemstone pendant

Uncertain; possibly black star sapphire, black spinel, or obsidian

Tumbled brown stone, possibly jasper or iron-rich quartz

Uncertain; likely microcrystalline quartz (SiO₂) with iron-oxide inclusions

Carved stone bowl or mortar

Uncertain; likely steatite (soapstone) or fine-grained volcanic stone

Weathered metallic rock, possibly iron-rich ore

Uncertain; possible goethite–hematite limonite or iron-nickel meteorite

Unidentified pale pink rough mineral specimen

Possibly rose quartz or feldspar; identification is uncertain from the photograph

Weathered quartz-rich rock, possibly quartzite or vein quartz

Quartzite (mostly SiO₂), but exact identification is uncertain from the image

Mixed river-worn rock collection

Uncertain; likely quartzite, sandstone, basalt, and weathered granite or gneiss

Gold-colored mineral specimen, likely pyrite or weathered mica schist

Tentatively pyrite (FeS₂); identification is uncertain from the obscured image

Possible weathered metal-rich rock or slag fragment

Uncertain; possibly iron-oxide-rich breccia or industrial slag

Possible iron-rich meteorite

Uncertain; likely an ordinary chondrite (stony meteorite), pending testing

Weathered iron-rich rock fragment

Uncertain; possibly limonite/goethite-bearing ironstone or weathered basalt

Tumbled yellow chalcedony (likely citrine or yellow jasper)

Microcrystalline quartz, SiO₂; exact identification is uncertain from the photograph