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

Dyed Dalmatian Jasper (Dalmatian Stone)

Perthitic Feldspar with Arfvedsonite inclusions

Blue Goldstone

Synthetic Avanturine Glass (or Aventurine Glass)

Tumbled blue chalcedony/agate (likely glassy silica material)

Microcrystalline quartz, SiO₂; possibly blue chalcedony or dyed agate

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

Probable fine-grained basalt; exact identification requires testing

Pink Quartz (likely dyed)

Silicon Dioxide (SiO2)

Vesicular basalt (possibly slag-like volcanic rock)

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

Cullet Glass (Slag)

Amorphous Silicon Dioxide (Man-made)

Blue Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Landscape Jasper

Microcrystalline quartz (SiO2) with iron and manganese oxide inclusions

Blue-green peacock chalcopyrite

Chalcopyrite, CuFeS₂, artificially oxidized/iridescent-coated

Tumbled jasper

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

Tumbled quartz bead bracelet

Quartz (SiO₂), likely milky or rose quartz

Tumbled Quartz

Silicon Dioxide (SiO2)

Possible iron-rich basalt or slag-like volcanic rock

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

Obsidian (black volcanic glass)

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

Tumbled brown stone, possibly jasper or weathered chert

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

Black Agate

Chalcedony (SiO2)

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

Quartz, silicon dioxide (SiO₂)

Tumbled quartz crystal (likely smoky or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

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

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

Pink Dyed Agate Geode Slice

Cryptocrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron inclusions

Blue Agate (likely dyed)

Silicon Dioxide (SiO2)

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Jasper

Silicon dioxide (SiO2) with impurities

Picture Jasper

Silicon Dioxide (SiO2)

Conglomerate (Asphaltic/Anthropogenic)

Clastic sedimentary rock / Bituminous mixture

Possible chalcopyrite-bearing sulfide fragment

Likely chalcopyrite (CuFeS₂), possibly with pyrite or bornite

Red jasper pebble

Jasper, an opaque, iron-oxide-colored variety of microcrystalline quartz (SiO₂)

Jasper

Silicon Dioxide (SiO2) with impurities

Jasper

Silicon dioxide (SiO2) with impurities

Dark, weathered stone—possibly basalt or slag

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

Polished ocean jasper (orbicular jasper)

Microcrystalline quartz/chalcedony with iron oxides and accessory minerals; SiO₂-dominant

Picture Jasper

Silicon dioxide (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Iron-rich jasper or weathered hematite-bearing rock

Ferruginous jasper, primarily microcrystalline quartz (SiO₂) with iron oxides such as hematite (Fe₂O₃) and goethite (FeO(OH))

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

Impression Jasper

Microcrystalline Quartz (SiO2)

Brecciated jasper (likely ocean jasper or red jasper)

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

Possible iron-rich basalt or industrial slag

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

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions