Synthetic (Ceramic)

Likely weathered limestone or calcareous tuff

Calcite-rich carbonate rock, chiefly CaCO₃; exact identification is uncertain from the image

Ferruginous Sandstone (Ironstone)

Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)

White howlite (likely small tumbled pieces)

Howlite, Ca₂B₅SiO₉(OH)₅

Iron-rich sandstone or lateritic ironstone pebble

Ferruginous sandstone/ironstone, composed mainly of quartz (SiO₂) and iron oxides such as hematite (Fe₂O₃) and goethite (FeO(OH))

Tumbled dark-blue stone, possibly sodalite or dyed stone

Likely sodalite (Na₈Al₆Si₆O₂₄Cl₂); exact identification requires testing

Weathered granitic rock fragment

Likely granite or granodiorite, chiefly quartz, feldspar, and minor biotite/hornblende

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Cut purple gemstone, likely synthetic cubic zirconia or glass

Undetermined; possible cubic zirconia (ZrO₂)

Ruby (set in a ring; possibly synthetic or imitation)

Corundum, Al₂O₃; red color is typically caused by chromium

Faceted red gemstone, likely ruby

Corundum (Al₂O₃), red variety colored mainly by chromium

Diamond-set gold ring

Diamond (carbon, C) in a gold-alloy setting; the stone may be a diamond or a diamond simulant

Likely weathered sandstone or iron-stained sedimentary pebble

Indeterminate clastic sedimentary rock; possibly quartz-rich sandstone

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

Blue Obsidian

Volcanic Glass (Amorphous)

Porcelain (Stoneware Ceramic)

Mullite / Silica-glass composite (Al6Si2O13)

Red gemstone ring (likely synthetic ruby or red glass)

Possibly corundum (Al₂O₃), chromium-colored; identity cannot be confirmed from the image

Porcelain (White Ceramic)

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

Magnetic Hematite (Man-made)

Iron Oxide (Fe2O3) with Barium-Strontium Ferrite

Faceted Clear Gemstone (Likely Quartz or Cubic Zirconia)

Silicon Dioxide (SiO2) or Zirconium Dioxide (ZrO2)

Limonite

Hydrous ferric oxides (FeO(OH)·nH2O)

Faceted Quartz or Cubic Zirconia

SiO2 (Quartz) or ZrO2 (Cubic Zirconia)

Dalmatian jasper (Dalmatian stone)

Commercially called Dalmatian jasper; typically a feldspar-rich rock with dark arfvedsonite or tourmaline-group inclusions, rather than true jasper

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)

Mood Ring Stone

Liquid crystal thermotropic polymer

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation

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

Pink feldspar pebble

Likely potassium feldspar (orthoclase or microcline; KAlSi₃O₈)

Orange/pink feldspar, likely potassium feldspar

Orthoclase or microcline, KAlSi₃O₈ (tentative visual identification)

Pink feldspar (likely orthoclase)

Orthoclase, KAlSi₃O₈

Green-and-white rough mineral specimen, possibly amazonite

Unconfirmed; possible amazonite, a green variety of microcline feldspar (KAlSi₃O₈)

Pink feldspar fragment (likely orthoclase or microcline)

Potassium feldspar, KAlSi₃O₈

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite Cobble

Metamorphosed Quartz Sandstone (SiO2)