Synthetic (Ceramic)

Pink feldspar fragment (likely orthoclase or microcline)

Potassium feldspar, KAlSi₃O₈

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite Cobble

Metamorphosed Quartz Sandstone (SiO2)

Pegmatite (Quartz with Tourmaline/Biotite inclusions)

Igneous Pegmatite

Lepidolite

K(Li,Al)3(Al,Si,IV)4O10(F,OH)2

Milky Quartz

Silicon dioxide (SiO2)

Porcelain (White Ceramic)

Mullite-bearing Vitrified Ceramic (Major phases: Mullite Al6Si2O13, Glassy Silica SiO2)

Opalite

Synthetic Opalized Glass

Opalite

Synthetic Opalite Glass

Opalite

Synthetic Opalised Glass

Opalite (Synthetic Moonstone/Opal)

Synthetic Silica Glass

Opalite

Synthetic Opalised Glass

Opalite

Synthetic Opalised Glass

Opalite (Man-made Glass)

Synthetic Opalised Glass

Faceted Clear Quartz or Diamond Simulant

Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation

SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)

Opalite

Synthetic glass (SiO2 + impurities)

Tumbled chalcedony (likely pale agate or common opal)

Microcrystalline quartz, SiO₂; possibly hydrated silica, SiO₂·nH₂O, if opal

Tumbled hematite-rich ironstone

Hematite (Fe₂O₃), likely mixed with magnetite and iron-bearing silicates

Dyed Howlite (Purple)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Hematite (Oolitic or Earthy variety)

Iron(III) oxide (Fe2O3)

Gemstone ring (stones not identifiable from image)

Unknown; the ring appears to contain two yellow stones and one colorless stone, possibly faceted gemstones or simulants

Gemstone rings (stones not reliably identifiable)

The pale stone may be quartz or another translucent gem; the red stone may be ruby, garnet, or synthetic corundum. Image detail is insufficient for identification.

Milky Quartz

Silicon Dioxide (SiO2)

Opalite

Synthetic Opalite Glass / Opalized Glass

Blue cabochon gemstone ring

Uncertain; likely blue sapphire (corundum, Al₂O₃), blue topaz, or synthetic glass/spinel

Red gemstone ring, likely ruby or synthetic ruby

Corundum (Al₂O₃), chromium-colored; the image alone cannot confirm whether it is natural or synthetic

Faceted Gemstones (Mixed)

Various (e.g., Corundum, Beryl, Quartz, or synthetic equivalents)

Ruby ring

Corundum (Al₂O₃), red variety colored mainly by chromium

Polished hematite bead (probable)

Hematite, Fe₂O₃

Coal (likely Bituminous or Lignite)

Organic Sedimentary Rock (Carbonaceous)

Polished dark mafic stone, likely basalt or diabase

Basalt/diabase; chiefly plagioclase feldspar and pyroxene, with possible olivine or iron-titanium oxides

Graphite-rich metamorphic rock (graphitic schist)

Graphitic schist; chiefly graphite (C), quartz (SiO₂), and mica minerals

Iron-rich concretion or weathered ironstone

Goethite–hematite-bearing ferruginous concretion; exact identification requires testing

Hematite

Iron(III) oxide (Fe2O3)

Tumbled brown-blue stone, possibly sodalite-bearing jasper

Likely quartz-rich jasper with blue sodalite or dumortierite; identification is uncertain from the image

Yellow Ochre / Limonite

Hydrated ferric oxide (FeO(OH)·nH2O)

Limonite

FeO(OH)·nH2O (Hydrated iron oxide)

Travertine (Ceramic Tile)

Terrestrial Sedimentary Rock / Calcium Carbonate (CaCO3)

Cubic Zirconia (Jewelry Setting)

Zirconium Dioxide (ZrO2)

Peach-colored feldspar (likely potassium feldspar)

Orthoclase or microcline, KAlSi₃O₈

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2