Mineralogical Simulant

Serpentinized ultramafic rock (serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, olivine, pyroxene, and brucite

Tumbled green aventurine (probable)

Quartz, SiO₂, with fuchsite mica inclusions

Faceted diamond

Diamond; crystalline carbon (C)

Diamond (or Diamond Simulant)

Native Carbon (C)

Diamond (or Diamond Simulant)

Carbon (C)

Diamond (or Diamond Simulant)

Carbon (C)

Diamond (or Diamond Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Colorless Gemstone (possibly Diamond or Cubic Zirconia)

C (Diamond) or ZrO2 (Cubic Zirconia)

Serpentine (Serpentinite)

Serpentinite (complex silicate group including lizardite, chrysotile, and antigorite)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC) / Moissanite (natural form)

Diamond (or synthetic simulant)

Cubic C (Carbon)

Likely serpentinite

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

Painite

Painite, CaZrAl₉O₁₅(BO₃)

Copper-bearing rock, likely native copper in a weathered matrix

Native copper (Cu), tentatively with copper sulfide/oxide minerals

Tumbled dark green stone, likely serpentine

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄)

Hag Stone

Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)

Cut diamond-like gemstone

Likely cubic zirconia (zirconium dioxide, ZrO₂) or glass; natural diamond (carbon, C) cannot be confirmed from an image

Diamond ring (likely diamond with gold band)

Diamond, crystalline carbon (C); band appears gold alloy

Colorless faceted quartz-like gemstone

Likely quartz (SiO₂), though the appearance may also indicate man-made glass or cubic zirconia

Mixed River Pebbles (Jasper, Hematite, and Quartzites)

Silicon dioxide (Jasper/Quartz) and Iron oxide (Hematite)

Diamond-set gold jewelry piece

Diamond, crystalline carbon (C), mounted in gold alloy

Diamond jewelry setting

Diamond (crystalline carbon, C) in a metal setting; the small stones’ identity is not visually confirmable

Labradorite

(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)

Sand Grain (Quartz)

Silicon Dioxide (SiO2)

Ironstone concretion (possibly a pyrite-bearing concretion)

Iron-oxide-cemented sedimentary concretion; exact mineral composition cannot be confirmed from the photograph

Bismuth crystal

Bismuth (Bi), commonly laboratory-grown

Polished amber

Fossilized tree resin (primarily organic polymerized diterpenes)

Ruby (Faceted)

Corundum (Al2O3:Cr)

Diamond (or Cubic Zirconia simulant)

Carbon (C) / Zirconium dioxide (ZrO2)

Dalmatian jasper (often sold as Dalmatian stone)

Porphyritic alkali feldspar–quartz syenite, commonly with black arfvedsonite/aegirine-group amphibole inclusions

Faceted yellow-brown gemstone ring, possibly citrine

Unidentified faceted gem; citrine is quartz (SiO₂), but the photo is insufficient for a reliable identification

Silicon Carbide (Carborundum)

Moissanite (SiC), though mostly synthetic

Graphite Schist

C (Carbonaceous Schist)

Serpentine-rich rock (likely antigorite serpentinite)

Serpentinite, composed mainly of serpentine-group minerals such as antigorite, lizardite, or chrysotile

Polished dark-blue cabochon, possibly blue sodalite

Undetermined; blue sodalite is a possible identification (Na₈Al₆Si₆O₂₄Cl₂)

Small rounded yellow pebble, likely quartz-rich rock

Indeterminate from image; possibly iron-stained quartz or chert

Small metallic meteorite-like specimen

Unclassified iron-rich meteorite candidate; possibly an ordinary chondrite or terrestrial slag

Diamond (likely) in an antique gold ring

Diamond, crystalline carbon (C)

Greenstone / Glauconitic Siltstone

Metabasalt or Glauconite-rich Sedimentary Rock

Polished greenstone pebble (likely serpentine or chlorite-rich stone)

Serpentine-group minerals, commonly antigorite/lizardite; possible chlorite-rich metamorphic rock

Tumbled dalmatian jasper (likely)

Microcrystalline quartz/chalcedony with black amphibole or aegirine inclusions; commonly sold as “dalmatian jasper”

Tumbled green aventurine (probable)

Quartz (SiO₂), commonly with fuchsite mica inclusions