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

Blue Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Iron-rich chert or jasper

Microcrystalline quartz (SiO₂), colored by iron oxides/hydroxides

Tumbled chalcedony or quartz pebble

Microcrystalline quartz, SiO₂ (likely chalcedony); exact identification is uncertain from the image

Blue resin-coated or dyed stone cabochon

Likely dyed chalcedony/agate (microcrystalline quartz, SiO₂); exact material is uncertain from the image

Dyed pink agate slice

Agate (microcrystalline quartz, SiO₂), commonly chalcedony with artificial dye

Chert (likely flint-bearing chert)

Microcrystalline quartz, SiO₂ (chalcedony/quartz aggregate)

Polished black stone, likely obsidian

Volcanic glass; chiefly amorphous SiO₂

Likely weathered metallic mineral or slag fragment

Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

Dyed Agate

Agate (Silicon Dioxide, SiO2)

Rainbow Quartz (Dyed/Coated Quartz)

Silicon Dioxide (SiO2) with artificial color enhancement

Citrine (Heat-Treated Amethyst)

Quartz (SiO2)

Tumbled smoky quartz

Quartz (SiO₂), brown smoky variety

Possible obsidian or slag glass

Volcanic glass, primarily SiO₂; alternatively industrial iron-rich glassy slag

Small dark mineral/rock fragment

Indeterminate; possibly magnetite-bearing basalt or iron-rich slag

Dyed Howlite (simulating Lavender/Purple Jade or Charoite)

Howlite: Ca2B5SiO9(OH)5 (when natural)

Dzi Bead (Agate Bead)

Cryptocrystalline Quartz (SiO2) - Chalcedony/Agate

Unidentified polished dark stone with a possible quartz fragment

Indeterminate; appearance may reflect polished basalt, obsidian, or iron-rich rock, with a pale quartz/feldspar inclusion

Blue glassy gemstone cabochon, likely dyed chalcedony or glass

Uncertain; possible dyed chalcedony (microcrystalline quartz, SiO₂)

Smoky Quartz

Silicon Dioxide (SiO2)

Rounded dark river pebble

Likely basalt or a basaltic volcanic rock; exact identification requires a fresh surface and tests

Blue Quartzite (Dyed)

Silicon Dioxide (SiO2) with inclusions

Dyed Agate (Tumbled)

Silicon Dioxide (Chalcedony variety, artificially dyed)

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), likely jasper/chert

Botryoidal hematite (specular hematite)

Hematite, Fe₂O₃

Dyed Blue Quartzite

SiO2 (Silicon Dioxide) with artificial colorants

Possible tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Likely obsidian fragment

Volcanic glass, predominantly rhyolitic composition (SiO₂-rich)

Iridescent bismuth crystal

Bismuth (Bi), commonly laboratory-grown and oxidized

Concrete

Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)

Green sea glass (likely slag glass or bottle glass)

Man-made soda-lime silicate glass; not a naturally occurring mineral

Tumbled blue jasper or blue-dyed jasper

Microcrystalline quartz (chalcedony), SiO₂; blue coloration may be natural or dye-enhanced

Aluminum Slag

Anthropogenic Aluminum (Al)

Tumbled brown agate or jasper pebble

Microcrystalline quartz, chiefly chalcedony (SiO₂), possibly iron-stained jasper

Iron-rich vesicular rock, possibly slag or weathered basalt

Identification uncertain; likely ferruginous basalt/ironstone, with possible anthropogenic iron slag

Jasper

Silicon Dioxide (SiO2) microcrystalline quartz

Red chalcedony (likely dyed or heat-treated)

Microcrystalline quartz, SiO₂; possibly red agate/carnelian

Dyed Crackle Quartz (Green)

Quenching-treated Quartz (Silicon Dioxide, SiO2)

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly a fragment of quartzite or silica-rich slag

Likely iron-rich rock or weathered metallic mineral fragment

Uncertain; possibly limonite/goethite or iron-bearing slag

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Blue chalcedony (likely dyed or coated)

Microcrystalline quartz, SiO₂ (chalcedony)