Mineralogical Simulant

Dalmatian jasper (likely orbicular microgranite)

Quartz–feldspar–biotite/pyroxene microgranite; commonly marketed as Dalmatian jasper

Dendritic Quartz

Silicon Dioxide (SiO2) with Manganese Oxide inclusions

Polished banded calcite/aragonite tower

Calcite (CaCO₃), possibly aragonite (CaCO₃)

Serpentine

Antigorite/Chrysotile/Lizardite mixture (Mg,Fe)3Si2O5(OH)4

Cubic Zirconia (as used in jewelry setting)

Zirconium dioxide (ZrO2)

Cubic Zirconia

Zirconium Dioxide (ZrO2)

Cubic Zirconia (CZ) in Gold-Plated Setting

Cubic Zirconium Dioxide (ZrO2)

Diamond (or Cubic Zirconia)

Carbon (C) or Zirconium Dioxide (ZrO2)

Polished orbicular gabbro tower

Gabbro, likely orbicular/pegmatitic variety; mainly plagioclase feldspar and pyroxene, with possible amphibole, olivine, and magnetite

Faceted transparent gemstone, likely glass or cubic zirconia

Uncertain from image; possible cubic zirconia (zirconium dioxide, ZrO₂) or glass imitation

Cubic Zirconia (as a jewelry specimen)

Zirconium dioxide (ZrO2)

Polished purple chalcedony (likely lavender agate)

Microcrystalline quartz, SiO₂; chalcedony variety, possibly naturally iron- or manganese-colored

Iron Slag

Iron smelting byproduct (Glassy/vesicular silicate)

Weathered greenish rock fragment

Indeterminate; possibly epidote- or chlorite-bearing altered silicate rock

Petrified Wood

Silicified Wood (SiO2)

Yellow chalcedony (likely dyed or heat-treated)

Microcrystalline quartz, SiO₂ (chalcedony)

Diamond (or Cubic Zirconia simulant)

C (Carbon) or ZrO2 (Zirconium Dioxide)

Tumbled green aventurine (probable)

Quartz, SiO₂, with fuchsite mica inclusions

Tumbled serpentine (likely nephrite-like greenstone)

Serpentine-group minerals, chiefly antigorite/lizardite; possibly mixed with tremolite-actinolite

Tumbled serpentine or chlorite-rich pebble

Serpentine-group minerals, chiefly antigorite/lizardite; possibly chlorite or greenstone

Cubic Zirconia (Faceted)

Zirconium dioxide (ZrO2)

Cubic Zirconia

Cubic Zirconium Dioxide (ZrO2)

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant

Dalmatian jasper

Quartz-bearing, orbicular microcrystalline silica (commonly sold as “Dalmatian jasper”; often an altered porphyritic igneous rock)

Dalmatian jasper (often sold as Dalmatian stone)

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

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

River Pebbles (Stream-rounded rocks)

Fluvial Detritus (varied mineralogy)

Cubic Zirconia (CZ)

Cubic Zirconium Dioxide (ZrO2)

Cubic Zirconia (Faceted)

Zirconium dioxide (ZrO2)

Cubic Zirconia (in Jewelry)

Zirconium Dioxide (ZrO2)

Faceted colorless gemstone, likely cubic zirconia or quartz

Uncertain from photograph; cubic zirconia (ZrO₂) is the leading visual possibility, with quartz (SiO₂) as an alternative

Cubic Zirconia (CZ)

Cubic Zirconium Dioxide (ZrO2)

Fossilized oyster shell in limestone

Bivalvia fossil; chiefly calcite (CaCO₃)

Weathered greenish-brown rock, likely serpentinized ultramafic rock

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), possibly with olivine, pyroxene, magnetite, or carbonate

Diamond (or Diamond Simulant)

Carbon (C) or Zirconium dioxide (ZrO2) for CZ

Graphite Schist

C (Carbonaceous Schist)

Tumbled brown-and-black stone, likely basalt or andesite

Fine-grained mafic to intermediate volcanic rock; commonly plagioclase, pyroxene, and possibly olivine or iron oxides

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)

Diamond (or Cubic Zirconia simulant)

Carbon (C) or Zirconium Dioxide (ZrO2)

Faceted colorless gemstone, likely cubic zirconia or diamond

Cubic zirconia (zirconium dioxide, ZrO₂) or diamond (carbon, C)

Cubic Zirconia (CZ) Jewelry

Zirconium dioxide (ZrO2)