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

Yellow Jasper

Silicon Dioxide (SiO2) - variety Jasper

Tumbled blue chalcedony/agate (likely glassy silica material)

Microcrystalline quartz, SiO₂; possibly blue chalcedony or dyed agate

Polished ocean jasper / orbicular jasper

Silicified rhyolite or chalcedony-rich microcrystalline quartz (SiO₂), commonly sold as ocean jasper

Quartz (likely milky quartz or quartz glass-like fragment)

Quartz, silicon dioxide (SiO₂)

Pink Dyed Agate Geode Slice

Cryptocrystalline Quartz (SiO2)

Tumbled Quartz

Silicon Dioxide (SiO2)

Dark polished stone, likely basalt or slag-like volcanic rock

Probable fine-grained basalt; exact identification requires testing

Blue Slag Glass

Amorphous Silica (Byproduct of smelting)

Picture Jasper

Silicon Dioxide (SiO2)

Tumbled quartz bead bracelet

Quartz (SiO₂), likely milky or rose quartz

Tumbled brown stone, possibly jasper or weathered chert

Uncertain; likely microcrystalline quartz (SiO₂), potentially iron-stained jasper/chert

Vesicular basalt (possibly slag-like volcanic rock)

Basalt, predominantly plagioclase–pyroxene–olivine; exact identification is uncertain from the photograph

Tumbled jasper

Microcrystalline quartz (SiO₂), commonly with hematite/goethite and other iron oxides

Crystal cave / solution cave

Karst cave containing speleothems, chiefly calcite (CaCO₃) and sometimes aragonite; likely a stock image rather than an individual specimen

Obsidian (black volcanic glass)

Obsidian; predominantly rhyolitic volcanic glass, mainly SiO₂ with minor feldspar, quartz, and iron oxides

Tumbled jasper (likely picture/brecciated jasper)

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Water-worn brown chert or jasper pebble

Microcrystalline quartz (SiO₂), likely ferruginous chert/jasper

Dark, weathered stone—possibly basalt or slag

Indeterminate; likely fine-grained basalt (plagioclase–pyroxene)

Brecciated jasper (likely ocean jasper or red jasper)

Microcrystalline quartz, SiO₂, with iron-oxide pigments and breccia cement

Aura Quartz (Pink/Rose Aura Quartz)

Silicon Dioxide (SiO2) bonded with Platinum and/or Silver

Peacock Ore (Bornite or Chalcopyrite)

Bornite (Cu₅FeS₄) or iridescent Chalcopyrite (CuFeS₂)

Conglomerate (Asphaltic/Anthropogenic)

Clastic sedimentary rock / Bituminous mixture

Possible iron-rich basalt or industrial slag

Basalt, likely Fe–Mg silicate rock; exact identification is uncertain from the blurred image

Tumbled reddish jasper

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Possible iron-rich basalt or slag-like volcanic rock

Basalt, tentatively; mineral composition likely plagioclase, pyroxene, and iron oxides

Agate (Polished Slice)

Banded Chalcedony (SiO2)

Dark blue-black polished crystal, likely fluorite or slag-like geological material

Tentatively fluorite (CaF₂); identification is uncertain from the image alone

Heat-Treated Citrine

Quartz (Silicon Dioxide, SiO2)

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2)

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky or smoky quartz

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron inclusions

Blue Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Jasper

Silicon dioxide (SiO2) with impurities

Moqui Marble (Shaman Stone)

Iron Oxide Concretion (Hematite/Goethite shell with Sandstone core)

Blue Obsidian

Volcanic Glass (SiO2 with inclusions)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Picture Jasper

Silicon dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

Cullet Glass (Slag)

Amorphous Silicon Dioxide (Man-made)

Jasper

Silicon Dioxide (SiO2) with impurities

Jasper

Silicon dioxide (SiO2) with impurities