Sedimentary (Artificial)

Painted River Rock (likely Quartzite or Granite)

Quartzite or Granitic Gneiss (painted)

Peridot (Olivine)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Rounded granitic gneiss or granite cobble

Biotite granite, possibly weakly foliated granitic gneiss; quartz–feldspar–biotite assemblage

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Polished black stone, likely black jasper or basalt

Most likely microcrystalline quartz (black jasper/chert), SiO₂; basalt is a plausible alternative

Pink granite (likely weathered)

Granite; predominantly quartz, potassium feldspar, plagioclase, and mica

Rose Quartz and Milky Quartz

Silicon Dioxide (SiO2)

Asphalt aggregate (crushed stone in bitumen)

Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen

Tumbled feldspar-rich rock, likely pink-orange microcline or granite fragment

K-feldspar (microcline/orthoclase), approximately KAlSi₃O₈; exact identification requires testing

Dyed Agate

SiO2 (Silicon Dioxide)

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Sea Glass

Amorphous silicon dioxide (glass)

Tumbled blue stone, likely blue aventurine or dyed chalcedony

Aventurine quartz (SiO₂) or chalcedony (microcrystalline SiO₂); exact identification requires testing

Tumbled blue chalcedony (likely blue quartz)

Chalcedony, cryptocrystalline SiO₂; possibly chrysoprase or dyed quartz

Tumbled smoky quartz (probable)

Quartz, SiO₂; smoky variety colored by irradiation-related defects

Dyed Agate

Chalcedony (Silicon Dioxide, SiO2)

Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating

Smoky quartz (likely)

Quartz, silicon dioxide (SiO₂), naturally irradiated variety

Blue glassy gemstone cabochon, likely dyed chalcedony or glass

Uncertain; possible dyed chalcedony (microcrystalline quartz, SiO₂)

Carnelian Agate

SiO2 (Silicon Dioxide - Chalcedony variant)

Dyed Blue Agate

Silicon Dioxide (SiO2) with artificial cobalt-based dye

Mixed sandstone and iron-rich sedimentary rock fragments

Quartz arenite/subarkose, with ferruginous cement and possible iron-oxide staining

Peacock ore (likely chalcopyrite-bornite specimens)

Iridescent chalcopyrite, CuFeS₂, commonly altered to bornite, Cu₅FeS₄

Dyed blue banded agate (tumbled)

Microcrystalline quartz, SiO₂ (chalcedony variety)

Tumbled chalcedony (likely carnelian or common agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Blue chalcedony (likely dyed or coated)

Chalcedony, microcrystalline quartz (SiO₂)

Carved smoky quartz (likely)

Quartz, silicon dioxide (SiO₂), smoky variety

Dyed pink banded agate

Chalcedony (microcrystalline quartz), SiO₂, commonly dyed

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), opaque-to-translucent milky variety

Iridescent polished/tumbled stone (likely coated quartz or glassy synthetic material)

Indeterminate; possibly quartz (SiO₂) with an artificial iridescent coating

Blue Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Citrine

Silicon dioxide (SiO2)

Dyed Dalmatian Stone (Dalmatian Jasper)

Aplite (predominantly quartz, feldspar, and arfvedsonite)

Ferrous Slag

Fused calcium-iron silicates (Industrial Slag)

Peridot (Olivine)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Black volcanic glass (likely obsidian)

Obsidian; predominantly rhyolitic volcanic glass composed chiefly of amorphous SiO₂

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Green Chalcedony (Batu Akik)

Silicon Dioxide (SiO2)

Red Tiger's Eye

Silicified Crocidolite (Quartz pseudo-morph after Crocidolite), SiO2

White quartz pebble

Quartz (silicon dioxide, SiO₂)

Tumbled quartz-rich pebble, possibly calcite or quartzite

Most likely microcrystalline quartz (SiO₂); carbonate identification would require testing

Blue glassy tumbled stone, likely blue chalcedony or slag glass

Chalcedony (microcrystalline SiO₂), possibly man-made blue glass