Uncertain

Iron-rich concretion or weathered ironstone

Goethite–hematite-bearing ironstone; identification is uncertain from appearance alone

Weathered quartz-rich metamorphic pebble

Likely quartzite or quartz-mica schist; identification is uncertain from the photograph

Blue sea glass or blue glassy mineral fragment

Uncertain; likely man-made soda-lime glass, not a natural mineral

Tumbled amber-colored glassy mineral specimens

Likely citrine or yellow chalcedony; exact identification is uncertain from the photograph

Weathered wood-like rock surface, likely slate or schist

Probable graphitic schist or slate; exact identification is uncertain from the image

Small polished dark-blue stone, likely sodalite or blue aventurine

Probable sodalite (Na8(Al6Si6O24)Cl2); identification is uncertain from the image

Tumbled brown chalcedony (likely chert or agate)

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

Weathered brown rock fragment

Likely altered basalt or andesite; precise identification is uncertain from the image

Polished yellow-brown agate or jasper fragment

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

Blue glassy mineral fragment, likely kyanite or blue corundum

Tentatively kyanite (Al₂SiO₅); visual identification is uncertain from the photograph

Tumbled green-blue glassy mineral, possibly fluorite or aventurine

Uncertain from image; possible fluorite (CaF₂) or quartz aventurine (SiO₂)

Weathered quartz-rich pebble

Quartz-bearing granitoid or quartzite; exact identification is uncertain from the image

Weathered quartz-rich pebble, possibly quartzite or chert

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

Tumbled quartz-rich stone, possibly quartzite

Quartzite (mostly SiO₂); exact identification is uncertain from the blurry image

Gold-bearing quartz fragment (probable native gold)

Native gold (Au) in quartz (SiO₂), identification uncertain from the photograph

Quartz-rich stone fragment (probable quartzite or chert)

Quartzite, composed predominantly of SiO₂; exact identification is uncertain from the image

Blue-green cabochon, likely chalcedony or treated glass imitation

Cryptocrystalline quartz (chalcedony/possibly chrysoprase); identification uncertain from image

Weathered granite or granitic gneiss fragments

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

Tumbled limestone or calcite-rich stone

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

Polished amber-colored stone, possibly chert or jasper

Uncertain from image; likely microcrystalline quartz (SiO₂) if chert/jasper

Weathered quartz-rich rock, possibly chert or milky quartz

Mostly microcrystalline or crystalline quartz (SiO₂), identification uncertain from photograph

Likely basalt with a pale mineral-filled vesicle

Vesicular basalt, probably containing calcite or zeolite (uncertain from image)

Rounded gray metamorphic rock, likely quartzite or gneiss

Quartz-rich metamorphic rock; exact identification is uncertain from the photograph

Tumbled blue chalcedony or pale aquamarine-like quartz

Chalcedony (microcrystalline SiO₂), possibly blue quartz; visual identification is uncertain

Weathered granite-like rock

Granite, likely biotite-bearing; exact identification is uncertain from the image

Likely metallic sulfide mineral fragment

Possibly galena (PbS) or pyrite (FeS₂); identification is uncertain from the photograph

Small tumbled dark stone, possibly basalt or slag

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

Champagne topaz (likely)

Topaz, Al₂SiO₄(F,OH)₂

Iron-stained milky quartz

Quartz (SiO₂), mainly massive or vein quartz, with reddish-brown iron-oxide staining and possible minor feldspar or other vein minerals

Quartz cabochon ring (stone identity uncertain)

Quartz, SiO₂ (possible smoky or included quartz)

Tumbled jasper or iron-rich chert (uncertain)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Red jasper or glassy volcanic rock (uncertain)

Likely hematite-rich jasper/chert; possibly obsidian with iron-oxide staining

Polished pink feldspar or quartz pebble (uncertain)

Likely microcline feldspar (KAlSi₃O₈) or quartz (SiO₂), with iron-oxide inclusions

Tumbled blue quartzite or blue chalcedony (uncertain)

Quartz-rich rock; predominantly silicon dioxide (SiO₂)

Purple cabochon gemstone, likely charoite

Charoite, a complex potassium-calcium silicate mineral; identification from the image is uncertain

Tumbled blue-gray agate

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

Likely iron-rich concretion or weathered rock pebble

Uncertain from the image; possibly an iron-oxide-cemented concretion (goethite/hematite)

Quartz-rich foliated rock, possibly milky quartz vein material

Likely quartz-rich metamorphic rock; exact identification is uncertain from the image

Quartz-bearing sulfide ore (possibly galena in a quartz matrix)

Likely galena (PbS) with quartz (SiO₂); identification is uncertain from the image alone

Iron-stained quartz-rich pebble

Likely quartz with iron-oxide staining; exact identification is uncertain from the image

Iron-stained quartz (likely quartz-rich rock)

Quartz, SiO₂, with iron-oxide staining; exact specimen uncertain from the image

Amethyst-bearing geode fragment

Quartz (SiO₂), with purple amethyst crystals; exact identification is uncertain from the image