Man Made Object (Simulant)

Unidentified brown stone

Indeterminate from the image; possibly a common iron-stained mineral or rock fragment

Likely rough pink feldspar or rose quartz

Most likely microcline feldspar (KAlSi₃O₈) or rose quartz (SiO₂)

Chert (likely jasper/chalcedony-rich chert)

Microcrystalline quartz, SiO₂

Polished agate bead bracelet

Agate, a banded microcrystalline variety of quartz (SiO₂), likely mixed-color dyed or naturally colored chalcedony

Dark polished stone, possibly a pebble

Undetermined; image lacks detail for reliable identification

Polished jasper pendant

Jasper, microcrystalline quartz (SiO₂) with iron-oxide and other mineral inclusions

Red faceted gemstone, likely synthetic ruby or red glass imitation

Possibly synthetic corundum (Al₂O₃:Cr³⁺); image alone cannot distinguish it from glass or another imitation

Howlite

Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)

Possible dark garnet or other rough mineral fragment

Undetermined; the image does not show enough diagnostic detail to identify a species

Blue sapphire ring

Corundum (aluminum oxide, Al₂O₃), likely heat-treated sapphire

Pink/red faceted gemstone, likely synthetic corundum or glass imitation

Corundum (Al₂O₃), ruby/sapphire variety; exact identification requires testing

Blue glass-like heart pendant, likely synthetic blue spinel or colored glass

Unconfirmed; possibly synthetic spinel (MgAl₂O₄) or cobalt-colored glass

Serpentinite

Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)

Jade (likely Nephrite or Jadeite)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)

Terrazzo (with Marble and Granite fragments)

Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates

Polished red jasper beads

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Diamond (or Cut Gemstone / Cubic Zirconia)

Carbon (C)

Heart-shaped ironstone pebble

Ironstone concretion, likely goethite/hematite cemented sandstone or siltstone

Diamond (or Cut Gemstone Simulants)

Carbon (C)

Faceted colorless gemstone, likely diamond

Diamond (crystalline carbon, C)

Blue chalcedony bead necklace

Chalcedony, microcrystalline quartz (SiO₂), commonly blue-dyed or blue-gray natural chalcedony

Likely polished dark gemstone cabochon

Indeterminate; possibly black chalcedony/agate, obsidian, or glass imitation

Ironstone concretion (likely goethite/limonite-rich)

Iron-oxide/hydroxide-rich concretion, commonly goethite (α-FeO(OH)) and limonite; exact identification requires testing

River Pebble

Polymictic rock fragment

Fossilized bivalve shell

Bivalvia indeterminate; likely a fossil clam or cockle

Red Jasper Cube

SiO2 (microcrystalline quartz)

Worn River Pebble with Fossil Indentation

Sedimentary Rock with Fossil Infill

Polished black stone carving, likely soapstone/steatite

Steatite (massive talc), Mg₃Si₄O₁₀(OH)₂; exact material cannot be confirmed from the image

Dyed howlite or turquoise imitation

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

Diamond ring

Diamond (crystalline carbon, C)

River Pebble (likely Quartzite or Chert)

Sedimentary Clast (Silicon Dioxide dominant)

Polished brown-green stone, likely jade or serpentine

Undetermined; possible jadeite (NaAlSi₂O₆), nephrite (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂), or serpentine-group mineral

Possible dark-green tumbled stone

Unidentified; possibly serpentine or green jasper

Unable to identify - Image contains non-geological items

Faceted clear gemstone in an ornate ring

Likely colorless cubic zirconia (zirconium dioxide, ZrO₂); the image is insufficient to distinguish it from diamond or glass

Possible smooth beach pebble (identity uncertain)

Unidentified fine-grained siliceous pebble; possibly chert or quartzite

Fossilized shell or coral fragment

Indeterminate biogenic carbonate; likely calcite/aragonite (CaCO₃)

Likely iron-rich concretion or weathered rock pebble

Uncertain from the image; possibly an iron-oxide-cemented concretion (goethite/hematite)

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Ruby-set gold ring

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

Painted River Rock (likely Quartzite or Granite)

Quartzite or Granitic Gneiss (painted)

Siltstone or Limestone Beach Pebble

Siltstone / Micritic Limestone