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

Cobalt Blue Slag Glass

Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives

Polished ocean jasper / orbicular jasper (likely)

Microcrystalline quartz (chalcedony), commonly with iron-oxide and other mineral inclusions

Blue Agate (Dyed)

Silicon Dioxide (SiO2)

Dyed Agate

Chalcedony (SiO2)

Dyed Quartz Geode

Dyed crystalline quartz (Silicon Dioxide, SiO2)

Blue Dyed Agate

Chalcedony (Silicon Dioxide, SiO2)

Likely black beach pebble

Undetermined; possibly basalt, chert, or dark slate

Dyed Agate (Tumbled)

Silicon Dioxide (SiO2) - stained microcrystalline quartz

Rainbow Hematite / Magnetic Hematite

Iron oxide (Fe2O3) - often synthetic/coated for beads

Polished red jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

Asphalt Chunk (Bituminous Concrete)

Aggregated Bitumen / Artificial Breccia

Dyed Agate

Agate (Silicon dioxide)

Iron-rich vesicular rock, possibly slag or basalt

Uncertain; likely basaltic rock (plagioclase–pyroxene–iron oxide) or industrial iron slag

Blue Agate (likely Dyed)

Silicon Dioxide (SiO2) - Chalcedony variety

Painted Rock / Geode Specimen

Silicon Dioxide with artificial pigment coating

Hag Stone (Odin Stone / Adder Stone)

Perforated Pebble (commonly Chert, Mudstone, or Limestone)

Dyed Agate

Chalcedony (SiO2)

Dyed Agate

Silicon Dioxide (SiO2) with artificial colorants

Tumbled black stone, likely obsidian

Obsidian (volcanic glass; predominantly SiO₂)

Tumbled blue-dyed stone, likely basalt or blue aventurine

Likely fine-grained basalt (plagioclase and pyroxene), possibly coated or dyed; exact identification requires testing

Dyed Quartz / Rose Quartz Imitation

Silicon Dioxide (SiO2) with artificial pigment

Banded Agate (Dyed / Polished)

Microcrystalline Quartz (SiO2)

Agate (Dyed) or composite stone

SiO2

Dyed Blue Agate

Silicon Dioxide (SiO2)

Titanium-Coated Hematite (Aura Hematite)

Titanium-bonded Hematite (Fe2O3 with a Ti coating)

Tumbled amethyst

Amethyst, purple variety of quartz (SiO₂)

Blue Agate Geode Slice

Silicon Dioxide (SiO2) - Chalcedony variety

Prasiolite

Silicon Dioxide (SiO2)

Dyed howlite (turquoise imitation)

Howlite, Ca₂B₅SiO₉(OH)₅; commonly blue-dyed

Blue Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Polished breccia-like rock specimen

Likely polymictic breccia or brecciated jasper, with quartz-rich fragments

Dyed Blue Agate

Silicon Dioxide (SiO2) with artificial pigment

Dyed Agate Slice

Silicon Dioxide (SiO2) - Chalcedony variety

Blue-dyed Quartz Druzy

Silicon Dioxide (SiO2) with artificial pigment

Dyed Quartz Pendant

Silicon Dioxide (SiO2) with artificial dye

Dyed Agate

Silicon Dioxide (Chalcedony with artificial colorant), SiO2

Dyed Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Dyed Purple Agate Sliced Tablet

Silicon Dioxide (SiO2), variety Chalcedony

Green chalcedony (likely dyed or treated)

Chalcedony, microcrystalline quartz (SiO₂)

Concrete aggregate surface

Human-made cementitious composite; primarily calcium-silicate-hydrate cement with mixed silicate aggregate

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Possible slag or basalt fragment

Indeterminate dark mafic material; likely basalt (plagioclase–pyroxene) or industrial iron-rich slag