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

Aura Quartz

Silicon Dioxide (SiO2) treated with metal vapor

Iron-stained chert or jasper

Microcrystalline quartz (SiO₂), likely limonite/goethite stained

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Dyed Agate

SiO2

Prasiolite (Green Quartz)

Silicon Dioxide (SiO2) with iron impurities

Blue Howlite (Dyed)

Dyed Howlite (Calcium Borosilicate Hydroxide, Ca2B5SiO9(OH)5)

Dyed Cracked Agate

Silicon Dioxide (Quartz variety, SiO2)

Red Painted Rock

Artificial Coated Lithic Fragment

Asphalt (Bituminous Rock)

Natural bitumen or Bituminous limestone/sandstone

Blue Onyx (Dyed Agate)

Cryptocrystalline Quartz (SiO2) with artificial pigment

Dyed Agate

Silicon dioxide (SiO2) with artificial colorant

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Polished ocean jasper / orbicular jasper (likely)

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

Tumbled brown jasper or iron-rich chert

Microcrystalline quartz (SiO₂), likely limonite/goethite-stained

Blue Dyed Agate

Chalcedony (Silicon Dioxide, SiO2)

Brown chalcedony (likely carnelian/iron-stained quartz)

Microcrystalline quartz, SiO₂; brown coloration from iron oxides/hydroxides

Cobalt Blue Slag Glass

Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives

Dyed Quartz Geode

Dyed crystalline quartz (Silicon Dioxide, SiO2)

Tumbled goldstone-like quartz pebble

Likely iron-stained quartz or jasper; exact identification requires testing

Blue Agate (Dyed)

Silicon Dioxide (SiO2)

Dyed Agate

Chalcedony (SiO2)

Asphalt Chunk (Bituminous Concrete)

Aggregated Bitumen / Artificial Breccia

Dyed Agate (Tumbled)

Silicon Dioxide (SiO2) - stained microcrystalline quartz

Green Onyx

Chalcedony (SiO2)

Likely black beach pebble

Undetermined; possibly basalt, chert, or dark slate

Slag

Industrial Silicate Slag

Polished red jasper pebble

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

Iron-rich vesicular rock, possibly slag or basalt

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

Painted Rock / Geode Specimen

Silicon Dioxide with artificial pigment coating

Rainbow Hematite / Magnetic Hematite

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

Dyed Agate Tower

Silicon dioxide (Quartz variety, SiO2)

Dyed Agate

Silicon Dioxide (SiO2) with artificial colorants

Tumbled black stone, likely obsidian

Obsidian (volcanic glass; predominantly SiO₂)

Dyed Agate

Agate (Silicon dioxide)

Dyed Blue Agate

Silicon Dioxide (Chalcedony with artificial dye, SiO2)

Dyed Quartz / Rose Quartz Imitation

Silicon Dioxide (SiO2) with artificial pigment

Hag Stone (Odin Stone / Adder Stone)

Perforated Pebble (commonly Chert, Mudstone, or Limestone)

Blue Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Banded Agate (Dyed / Polished)

Microcrystalline Quartz (SiO2)

Blue Agate (likely Dyed)

Silicon Dioxide (SiO2) - Chalcedony variety

Dyed Agate

Chalcedony (SiO2)

Mixed Tumbled Gemstones and Minerals

Various silicate and oxide minerals