Man Made Object (Simulant)

Polished citrine quartz point

Quartz, silicon dioxide (SiO₂), yellow-orange variety commonly sold as citrine; possibly heat-treated amethyst

Spiny Oyster Shell

Spondylus varians (Biogenic Calcium Carbonate)

Howlite

Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)

Banded agate pendant (likely carnelian or brown-and-white chalcedony agate)

Agate, a banded variety of chalcedony; microcrystalline quartz, SiO₂, with iron-oxide coloration

Obsidian (likely snowflake or banded variety)

Volcanic glass, primarily SiO₂

Likely biotite-rich mica schist

Mica schist, chiefly biotite (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂); exact identification from image is uncertain

Black-and-copper polished granite

Biotite granite, likely a commercial gabbro/granite variety

Quartz-rich stone tool or shaped mineral specimen

Likely milky quartz or quartzite (SiO₂); exact material cannot be confirmed from the image

Gemstone-set ring, likely cubic zirconia or diamond

Likely synthetic cubic zirconia (zirconium dioxide, ZrO₂); stones may alternatively be diamond (carbon, C)

Jadeite Jade

Jadeite (NaAlSi2O6)

Likely polished dark stone (identity uncertain)

Undetermined; possibly polished basalt, chert, or another dark silicate rock

Likely polished dark stone or mineral specimen (unidentifiable from image)

Undetermined; possibly dark quartz-rich material, basalt, or obsidian

Weathered limestone pebble

Limestone, chiefly calcite (CaCO₃)

Petrified Wood

Silicified wood (primarily SiO2)

Red gemstone ring, likely synthetic ruby or red spinel

Ruby: corundum (Al₂O₃); spinel: MgAl₂O₄; exact identity requires testing

Diamond (in jewelry setting)

Diamond (C - Carbon)

Diamond (appearing in jewelry)

Diamond (pure Carbon, C)

Polished mahogany obsidian

Volcanic glass (mostly SiO₂), commonly called mahogany obsidian

Optical Calcite

Calcite (Calcium Carbonate, CaCO3)

Polished rose quartz bowl

Quartz, silicon dioxide (SiO₂), likely rose quartz

Tumbled yellow quartz (likely citrine or iron-stained quartz)

Quartz, SiO₂; yellow color commonly from iron impurities or irradiation

Fossil bivalve shell

Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features

Iridescent polished/tumbled stone (likely coated quartz or glassy synthetic material)

Indeterminate; possibly quartz (SiO₂) with an artificial iridescent coating

Diamond (in jewelry)

Carbon (C)

Likely tumbled amethyst

Amethyst, purple quartz (SiO₂)

Likely yellow quartz gemstone ring

Quartz (SiO₂), possibly heat-treated citrine or lemon quartz; metal setting appears to be brass/gold-colored alloy

Granite with a polished dark-red granite cobble

Granite; predominantly quartz, feldspar, and mica

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Obsidian Arrowhead Replica (or similar knapped stone)

Obsidian (volcanic glass) or Chert

Possible iron-nickel meteorite

Unclassified suspected meteorite; composition and origin cannot be confirmed from the image

Fossil bivalve shell

Ribbed pectinid or related bivalve; originally calcite/aragonite (CaCO₃), likely partially mineralized

Polished orbicular jasper (likely leopard-skin or brecciated jasper)

Microcrystalline quartz (SiO₂) with iron-oxide minerals; exact variety uncertain from the image

Iron meteorite fragment

Fe-Ni meteorite, likely an iron meteorite or stony-iron fragment

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Larimar

Pectolite

Faceted blue gemstone ring, likely synthetic spinel or glass; identity uncertain

Possibly synthetic blue spinel (MgAl₂O₄) or laboratory sapphire (Al₂O₃); the clear side stones may be cubic zirconia or glass

Dark glassy pebble, possibly volcanic rock

Likely basalt or volcanic glass (var. obsidian), unconfirmed from image

Red garnet crystal (possible almandine)

Garnet group; likely almandine, Fe₃Al₂(SiO₄)₃

Petrified Wood

Silicified Wood (SiO2)

Unidentified small mineral fragment

Possibly quartz or feldspar-bearing rock; exact identification is uncertain from the image

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various metal oxide impurities

Diamond

Carbon (C)