Uncertain

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

Tumbled dark metallic mineral specimen, possibly hematite or magnetite

Hematite (Fe₂O₃) or magnetite (Fe₃O₄); visual identification is uncertain

Black tumbled stone, possibly obsidian

Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image

Granite-like rock specimens

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

Faceted yellow-brown gemstone ring, likely citrine

Citrine (iron-bearing quartz, SiO₂); identification from the photo is uncertain

Likely iron-oxide–stained quartz or quartzite pebble

Quartz (SiO₂), possibly as quartzite; exact identification is uncertain from the image

Possible galena-bearing ore specimen

Uncertain from the image; galena is lead sulfide (PbS), but the specimen is not diagnostic

Light-colored agate (likely chalcedony)

Chalcedony, microcrystalline quartz (SiO₂); exact variety is uncertain from the image

Small rounded gray stone, possibly flint or chert

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

Pale blue-green tumbled stone, possibly amazonite

Uncertain from the image; amazonite is a variety of microcline feldspar, KAlSi₃O₈

Tumbled blue stone, likely blue calcite or dyed stone

Probably calcite (CaCO₃); exact identification is uncertain from the blurred image

Polished black-and-white stone, possibly snowflake obsidian

Likely obsidian (volcanic glass); exact identification is uncertain from the photo

Polished feldspar-rich stone, possibly amazonite

Likely microcline feldspar (KAlSi₃O₈); identification is uncertain from the image

Small gray translucent stone, possibly quartz or glassy mineral

Uncertain; likely microcrystalline quartz (SiO₂), but the image is insufficient for definitive identification

Polished black-and-white banded stone, likely a dendritic agate or marble

Uncertain; probable calcite marble or chalcedony agate with white mineral veining

Likely weathered quartz-rich rock fragment

Uncertain; possibly quartz-bearing granitic or metamorphic material (SiO₂-dominant)

Likely weathered quartz-bearing rock

Uncertain; possibly quartz-rich feldspathic material, with iron-oxide staining

Light-colored weathered rock fragment

Likely limestone or calcareous sandstone; exact identification is uncertain from the photograph

Rounded brown pebble, likely chert or iron-stained quartzite

Microcrystalline quartz (SiO₂), possibly quartzite; identification is uncertain from the image

Rounded iron-rich pebble

Likely ferruginous sandstone or ironstone; exact identification is uncertain from the photograph

Tumbled greenish stone, possibly serpentine or aventurine

Uncertain; likely serpentine-group mineral or quartz-rich green aventurine

Polished/tumbled orange-brown stone, possibly brecciated jasper or quartzite

Uncertain; likely iron-stained microcrystalline quartz (SiO₂), potentially jasper

Colorless faceted gemstone, likely glass or cubic zirconia

Uncertain; possible cubic zirconia (zirconium dioxide, ZrO₂) or synthetic glass

Quartz-rich metallic-looking pebble

Likely quartz or quartzite; exact identification is uncertain from the blurred image

Weathered quartz-rich rock, possibly granite or quartzite

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

Dark rounded stone, possibly basalt

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

Weathered copper-bearing rock fragment

Likely malachite-bearing copper ore; identification uncertain from image

Tumbled pink chalcedony (likely rose quartz or pink agate)

Chalcedony, microcrystalline quartz (SiO₂); exact variety is uncertain from the image

Weathered iron-rich rock, possibly limonite-bearing sandstone or ironstone

Limonite/goethite-rich ferruginous sandstone; composition uncertain from the photograph

Weathered quartz-rich rock, possibly quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), identification uncertain from the photograph

Polished green cabochon, likely aventurine or serpentine

Quartz aventurine (SiO₂) or serpentine-group mineral; visual identification is uncertain

Weathered brown stone, possibly chert or iron-stained limestone

Uncertain; likely microcrystalline quartz (SiO₂) chert or calcitic limestone (CaCO₃)

Weathered fossil-bearing limestone, possibly coral or shell limestone

Calcite-rich limestone (CaCO₃); fossil identity is uncertain from the photograph

Weathered quartz-rich rock, possibly quartzite or granite fragment

Uncertain; likely quartz–feldspar aggregate, possibly altered granite or quartzite

Tumbled reddish-brown stone, possibly jasper or quartzite

Uncertain; likely microcrystalline quartz (SiO₂), potentially iron-stained jasper

Quartz-rich rock, possibly granite or pegmatite fragment

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

Rounded quartz-rich pebble

Likely milky quartz or quartzite (SiO₂), identification uncertain from image

Weathered iron-rich concretion or lateritic pebble

Goethite/hematite-bearing ferruginous concretion; composition uncertain from image

Weathered gray stone, possibly gneiss or granite with attached dark mineral coating

Uncertain; likely quartz–feldspar–biotite rock (granite) or banded gneiss

Likely amber or yellow-brown chalcedony/jasper fragment

Uncertain; possible amber (fossilized resin) or iron-stained chalcedony/quartz

Tumbled blue-gray chalcedony (likely common jasper/chalcedony)

Microcrystalline quartz, SiO₂ (chalcedony; exact variety uncertain from image)