Mineralogical Simulant

Dyed howlite or turquoise imitation

Howlite: Ca₂B₅SiO₉(OH)₅; turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O

Diamond ring

Diamond (crystalline carbon, C)

Serpentine-rich greenstone (probable serpentine/soapstone fragment)

Serpentine-group minerals, chiefly antigorite/lizardite; possibly minor talc, chlorite, and carbonate

Tumbled green aventurine (likely)

Quartzite dominated by quartz (SiO₂), with green fuchsite mica inclusions

Polished labradorite

Labradorite, calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

Polished serpentinite pebble

Serpentinite; primarily serpentine-group minerals (Mg3Si2O5(OH)4), with possible magnetite and talc

Polished pink-and-green feldspar-bearing rock, likely unakite or aventurine granite

Unakite-like epidote–feldspar–quartz aggregate; composition commonly K-feldspar + quartz + epidote

Flint or chert flake

Microcrystalline quartz (SiO₂), commonly chert/flint

Eclogite

Eclogite (Omphacite + Almandine-Pyrope Garnet)

Tumbled gray stone, likely serpentinite or weathered basalt

Tentatively serpentinite (predominantly serpentine-group minerals); identification is uncertain from the photograph

Quartz Pebble

Silicon Dioxide (SiO2)

Graphite-bearing quartz-mica schist

Graphite-rich quartz–mica schist; primarily quartz (SiO₂), muscovite/biotite, and graphite (C)

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

Carved amethyst fluorite (likely)

Amethyst, purple variety of quartz (SiO₂), possibly with fluorite (CaF₂)

Tumbled serpentine-rich altered rock

Serpentinite, likely antigorite/lizardite with accessory carbonate, quartz, or iron oxides

Likely graphite-rich schist (possibly galena-bearing metamorphic rock)

Graphite schist; chiefly quartz–mica with graphite (identification uncertain from photograph)

Unakite (likely)

Epidote–pink feldspar–quartz rock; commonly termed unakite

Small rounded green-gray pebble, likely greenstone

Greenstone (metamorphosed mafic rock; commonly chlorite- and epidote-bearing)

Weathered quartz-rich rock, possibly granite or quartzite

Indeterminate; likely quartz–feldspar aggregate, potentially altered granite

Tumbled Slate or Basalt Pebble

Metamorphic fine-grained rock / Slate or Phyllite

Cat's Eye Moonstone (Feldspar)

Orthoclase (KAlSi3O8) with Albite (NaAlSi3O8) inclusions

Likely serpentinite

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

Diamond (or Cubic Zirconia simulant)

Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ

Ruby-set gold ring

Ruby (corundum), Al₂O₃ colored red by chromium; mounted in a gold alloy

Colorless faceted gemstone, likely cubic zirconia

Synthetic cubic zirconia (ZrO₂), tentative; possibly diamond or synthetic moissanite

Hematite / Goethite (Iron Ore)

Iron Oxide (Fe2O3 / FeO(OH))

Polished greenstone pebble (likely epidote-bearing stone)

Epidote–chlorite amphibolite or altered basalt; composition likely epidote, chlorite, amphibole/pyroxene, and iron oxides

Diamond ring

Diamond, crystalline carbon (C), likely a faceted mounted stone

Diamond (or Diamond Simulant/Cubic Zirconia)

Carbon (C) - if diamond, or Zirconium dioxide (ZrO2) - if Cubic Zirconia

Granite

Granite (Felsic Plutonic Rock)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Tumbled sodalite (probable)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue-dyed jasper or lapis lazuli

Tanzanite earrings

Tanzanite, blue-violet zoisite (Ca₂Al₃(SiO₄)₃(OH))

Weathered rhyolitic tuff or altered volcanic rock

Felsic volcanic tuff, likely devitrified or hydrothermally altered

Likely gabbro or basaltic rock fragments

Mafic igneous rock, chiefly plagioclase feldspar and pyroxene; exact identification requires testing

Diorite Gneiss

Foliated Diorite Gneiss

Polished brecciated jasper (likely mookaite or similar jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact variety cannot be confirmed from the image

Serpentinite (probable)

Serpentinite; chiefly serpentine-group minerals, Mg3Si2O5(OH)4, with possible magnetite, chromite, and carbonate

Serpentinite

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

Polished serpentine-rich stone

Serpentinite, primarily serpentine-group minerals (antigorite, lizardite, or chrysotile)

Blue sodalite-bearing rock (likely sodalite rough)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, possibly in syenite or lapis-lazuli-like matrix

Tumbled mica-rich stone, likely muscovite schist

Muscovite-bearing quartz schist; chiefly muscovite mica, quartz, and possibly feldspar