Unknown (Likely Sedimentary Or Metamorphic)

Weathered, vuggy quartz-rich rock (possibly quartz vein material)

Likely massive quartz (SiO₂) with iron-oxide staining and dark mineral inclusions; exact rock type cannot be confirmed visually.

Unidentifiable blurred specimen

Cannot be determined from the image

Mixed river stones and gravel

Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate

Malachite-bearing rock

Malachite, Cu₂CO₃(OH)₂, likely with limonite or host-rock matrix

Tumbled green stone, likely serpentine

Serpentine-group minerals, commonly antigorite or chrysotile; approximate composition Mg₃Si₂O₅(OH)₄

Conglomerate

Polymictic, matrix-supported conglomerate

Small quartz crystal fragment

Quartz, SiO₂

Amethyst and Calcite collection

Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)

Serpentine-rich metamorphic rock

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and carbonates

Tumbled clear quartz

Quartz (silicon dioxide, SiO₂)

Mixed Mineral Collection

Multi-mineral Assemblage (Quartz, Jasper, Obsidian, Pyrite, etc.)

Limonite or Goethite (Ironstone)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Dark rounded pebble

Likely basalt or another fine-grained mafic volcanic rock; exact identification is uncertain from the image

Faceted clear gemstone in a gold-tone ring, likely colorless glass or cubic zirconia

Undetermined; possible cubic zirconia (ZrO₂) or glass (amorphous SiO₂)

Likely native silver-bearing ore or metallic slag-like specimen

Uncertain from the photograph; possible native silver (Ag), but identification requires testing

Serpentinite (serpentinized ultramafic rock)

Serpentine-group minerals, chiefly lizardite and antigorite; commonly derived from peridotite

Unidentified small rock fragment

Undetermined; the photo does not show enough detail for reliable mineral identification.

Apatite

Fluorapatite (Ca5(PO4)3F)

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

Quartz (likely milky or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Tumbled serpentine

Serpentinite; chiefly antigorite, lizardite, and/or chrysotile Mg₃Si₂O₅(OH)₄

Red sandstone

Iron-oxide-stained quartz sandstone; exact mineral composition cannot be confirmed from the image

Serpentine-rich metamorphic cobble

Serpentinite, principally antigorite/lizardite Mg3Si2O5(OH)4, possibly with magnetite and minor carbonate

Fossilized tooth (possibly a shark tooth)

Indeterminate vertebrate tooth; species cannot be confirmed from this image

Small brown mineral fragment, possibly amber-colored quartz or chalcedony

Undetermined from image; quartz/chalcedony (SiO₂) is one possibility

Yellow-brown stone or mineral fragment

Unidentified; the image does not show enough detail for a reliable identification

Blue-gray mineral specimen (possibly sodalite)

Undetermined; appearance may be consistent with sodalite (Na₈Al₆Si₆O₂₄Cl₂), but the image is insufficient for reliable identification

Possible green tumbled stone

Unidentified green mineral or rock; the image is too blurred for reliable identification

Orange halite (rock salt)

Halite, sodium chloride (NaCl)

Weathered schist or phyllite

Mica schist/phyllite, likely quartz–mica-rich metamorphic rock

Small weathered mineral/rock fragment

Indeterminate; possibly quartz-bearing feldspathic rock or calcite-rich specimen

Tumbled serpentine

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; commonly Mg₃Si₂O₅(OH)₄

Tumbled serpentine or soapstone pebble

Serpentine-group minerals, chiefly antigorite/lizardite; possibly talc-rich steatite

Tiny rounded metallic-looking pebble, possibly pyrite or a metal-rich mineral

Uncertain from image; possible pyrite (FeS₂), chalcopyrite (CuFeS₂), or magnetite (Fe₃O₄)

Green serpentine-rich rock (possibly serpentinite)

Serpentinite, composed chiefly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile)

Serpentine-rich metamorphic rock

Serpentinite, dominated by serpentine-group minerals (antigorite/lizardite/chrysotile), with possible magnetite and carbonate

Green serpentine

Serpentine-group minerals, chiefly lizardite and antigorite; approximate formula Mg₃Si₂O₅(OH)₄

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

White Agate / Chalcedony

Silicon Dioxide (SiO2)

Mineral and rock specimen collection

Assorted geological materials, including amethyst, agate, azurite, calcite, feldspar, garnet, jasper, malachite, pyrite, quartz varieties, and others

Light-colored pebble, likely quartzite or weathered limestone

Indeterminate from image; possible quartzite (microcrystalline SiO₂)