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

Yellow Quartz (Citrine type/Tumbled Quartz)

Silicon Dioxide (SiO2)

Dyed Purple Agate Sliced

Silicon Dioxide (SiO2) with artificial pigment

Carnelian Agate

SiO2 (Silicon Dioxide - Chalcedony variant)

Blue Chalcedony (Agate)

Silicon Dioxide (SiO2)

Purple glassy pebble, possibly slag glass

Unidentified; likely man-made glass rather than a natural mineral

Aura Agate

Silicon Dioxide with metal coating (SiO2)

Likely weathered metallic mineral or slag fragment

Uncertain; possibly limonite/goethite-coated iron mineral, or industrial iron slag

Pink Banded Agate (Dyed)

Chalcedony (cryptocrystalline silica), chemical formula SiO2

Aura Quartz (Pink/Magenta Aura Quartz)

Silicon Dioxide (SiO2) treated with vapor-deposited precious metals

Pink Dyed Agate (Pink Agate Slice)

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Heat-Treated Citrine (Amethyst-based)

Quartz (Silicon Dioxide) - SiO2

Yellow Chert (Yellow Jasper)

Silicon dioxide (SiO2)

Dyed pink agate slice

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

Dyed Agate

Silicon Dioxide (SiO2) with synthetic dyes

Agate

Banded Chalcedony (SiO2)

Likely weathered metallic mineral or slag fragment

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

Blue Agate (Dyed)

Silicon Dioxide (SiO2) - Variety of Chalcedony

Vesicular basalt (possibly scoriaceous basalt)

Vesicular basalt; chiefly plagioclase, pyroxene, and iron-rich oxides

Banded Agate (Dyed)

Silicon Dioxide (SiO2) with impurities

Dyed Agate Slice

Silicon Dioxide (SiO2)

Citrine Quartz / Yellow Quartz Pebbles

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2) with natural radiation treatment

Smoky Quartz

Silicon dioxide (SiO2)

Silicon Carbide (Carborundum)

Moissanite (SiC), though mostly synthetic

Lemon Quartz

Silicon Dioxide (SiO2)

Blue glass-like tumbled specimen

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

Polished black stone, likely obsidian

Volcanic glass; chiefly amorphous SiO₂

Small dark mineral/rock fragment

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

Dyed Blue Quartzite

SiO2 (Silicon Dioxide) with artificial colorants

Aluminum Slag

Anthropogenic Aluminum (Al)

Dragon Vein Agate (Dyed)

SiO2

Citrine

Silicon dioxide (SiO2)

Possible obsidian or slag glass

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

Concrete

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

Dyed Agate

Agate (Silicon Dioxide, SiO2)

Likely obsidian fragment

Volcanic glass, predominantly rhyolitic composition (SiO₂-rich)

Blue Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Small translucent tumbled crystal or gemstone

Indeterminate; likely quartz (SiO₂), possibly citrine or glass-like chalcedony

Orbicular jasper (likely ocean jasper)

Silica-rich microcrystalline quartz/chalcedony with iron-oxide and other mineral inclusions; commonly classified as orbicular jasper

Rounded dark river pebble

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

Tumbled chalcedony or quartz pebble

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

Botryoidal hematite (specular hematite)

Hematite, Fe₂O₃