Sedimentary (If Natural Jasper) Or Artificial (If Slag)

Smoky quartz-bearing rock

Smoky quartz (SiO₂), possibly in a pegmatitic or quartz-rich matrix

Black-and-white jasper

Jasper, microcrystalline quartz (SiO₂), with contrasting white mineral inclusions

Tumbled dark stone, possibly river pebble or hematite

Uncertain; candidates include hematite (Fe₂O₃), basalt, or dark chert

Polished jasper slab

Jasper, an opaque microcrystalline variety of chalcedony (SiO₂), colored mainly by iron oxides

Turquoise-colored stone bead necklace

Likely turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O), but the bead may be dyed or another blue-green stone

Bornite (Peacock Ore) / Acid-treated Chalcopyrite

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2)

Polished jasper pebble

Microcrystalline quartz (chalcedony), chiefly SiO₂, with iron-oxide impurities

Tumbled orange chalcedony / jasper

Microcrystalline quartz, SiO₂, likely iron-stained chalcedony or quartz-rich jasper

Shiva Lingam

Cryptocrystalline Quartz (Jasproid/Chalcedony mix)

Artificial Rock Face (Faux Rock)

Glass Fiber Reinforced Concrete (GFRC)

Banded Ironstone / Jasper Siltstone

Siltstone with Iron Oxide Hydrates (SiO2 with Fe2O3/FeO(OH))

Black Onyx

Onyx (Silicon Dioxide, SiO2)

Jasper Pebble

Microcrystalline Quartz (SiO2)

Weathered basaltic rock (probable vesicular basalt)

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine, with iron-oxide alteration

Agate

Agate (Silicon Dioxide, SiO2)

Crackle Quartz (Dyed)

SiO2 (Silicon Dioxide) - Treated

Green Slag Glass

Cullet (Amorphous Silicon Dioxide with impurities)

Tumbled black stone, likely black tourmaline

Schorl tourmaline, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Tumbled dark stone, likely basalt

Basalt; fine-grained mafic volcanic rock, commonly composed of plagioclase, pyroxene, and minor olivine

Cullet Glass (Industrial Slag Glass)

Amorphous Silica (SiO2) with metallic oxide impurities

Smoky quartz (likely faceted cabochon or rough fragment)

Quartz, silicon dioxide (SiO₂), smoky variety colored by irradiation-related defects

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Tumbled jasper

Microcrystalline quartz (SiO₂), commonly iron-rich jasper

Polished pink gemstone, likely dyed quartz or chalcedony

Uncertain from image; possibilities include dyed quartz (SiO₂) or chalcedony (microcrystalline SiO₂)

Tektite (Indochinite)

Tektite (High-silica natural glass)

Red jasper (likely polished or dyed)

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

Iridescent bismuth crystal

Bismuth (Bi), commonly laboratory-grown and oxide-coated

Dyed and polished agate beads

Chalcedony (microcrystalline quartz), SiO₂; commonly agate

Polished/tumbled brecciated jasper

Silica-rich microcrystalline quartz (chalcedony), commonly with iron-oxide minerals and assorted lithic fragments

Dyed green agate pendant

Microcrystalline quartz (chalcedony), SiO₂; likely dyed agate

Polished/tumbled yellow-brown chert (likely jasper)

Microcrystalline quartz (chalcedony), SiO₂, iron-oxide colored

Yellow-brown chert or jasper pebble

Microcrystalline quartz (SiO₂), likely iron-stained chert/jasper

Likely polished/tumbled garnet

Garnet-group silicate, likely almandine–pyrope solid solution; approximate formula Fe₃Al₂(SiO₄)₃–Mg₃Al₂(SiO₄)₃

Vesicular basalt pebble

Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine

Red Jasper (Siltstone or Chert-based Jasper)

Silicon dioxide with hematite (SiO2 + Fe2O3)

Tumbled dark stone, likely banded iron formation or hematite-rich jasper

Hematite-bearing quartz/jasper; probable iron oxide–silica aggregate

Tumbled smoky quartz with iron-stained inclusions

Quartz (SiO₂), likely smoky quartz variety

Likely tumbled orange-brown jasper or chert

Microcrystalline quartz (SiO₂), probably iron-oxide-bearing jasper

Tumbled Black Stone

Unknown (possibly basalt, obsidian, or black jasper)

Banded Agate / Jasper (Chert Pebble)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert with Chalcedony/Quartz Vug

Cryptocrystalline Silica (SiO2)

Rounded basalt cobble

Basalt, a fine-grained mafic volcanic rock; mainly plagioclase feldspar, pyroxene, and commonly olivine