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

Purple Agate (Dyed Chalcedony)

SiO2 (Silicon Dioxide) with organic dyes

Red Tigers Eye (Bull's Eye)

SiO2

Obsidian-like volcanic glass (likely slag or natural obsidian)

Obsidian, primarily amorphous volcanic silica glass (approximately SiO₂); identification is uncertain from an image

Likely rough green-blue glassy mineral fragment

Unidentified; the image is insufficient to distinguish a natural mineral from industrial slag or glass

Vesicular basalt (scoria-like volcanic rock)

Vesicular basalt; chiefly plagioclase, pyroxene, and olivine with gas cavities

Slag

Anthropogenic Vitreous Silicate / Ferro-silicate Slag

Tumbled chert or flint pebble

Microcrystalline quartz (SiO₂), likely chert/flint

Dyed and Crackle Agate

Silicon dioxide (chalcedony, SiO2)

Dyed Dalmatian Stone (Dalmatian Jasper)

Aplite (predominantly quartz, feldspar, and arfvedsonite)

Citrine

Silicon Dioxide (Quartz variety), SiO2

Tumbled quartz-rich stone, possibly smoky quartz or chert

Uncertain; likely microcrystalline quartz, SiO₂

Blue-dyed tumbled stone, likely calcite or quartz

Uncertain; commonly dyed quartz (SiO₂) or calcite (CaCO₃)

Yellow Quartz

SiO2 (Silicon Dioxide)

Iridescent red crystal cluster, likely aura-coated quartz

Quartz (SiO₂), possibly metal-coated; exact identification is uncertain from the photo

Tumbled brown chalcedony or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper

Citrine Quartz

Silicon Dioxide (SiO2)

Lemon Quartz

Silicon Dioxide (SiO2)

Dyed Pumice

Vesicular Rhyolite (Artificial Coloration Addition)

Iron Slag

Anthropogenic Ferro-silicate

Dyed Agate

SiO2 (Silicon Dioxide)

Uncertain fine-grained rock or mineral-bearing specimen

Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains

Dyed Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial pigment

Aura Quartz Bead

Silicon dioxide (SiO2) with metal coating

Slag

Anthropogenic Vitrification Product / Silicate Slag

Dyed Blue Agate

Silicon Dioxide (SiO2) with artificial pigment

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Tumbled brown jasper or chert pebble

Microcrystalline quartz (SiO₂), likely jasper/chert

Possible iron-rich concretion or weathered ironstone

Goethite/limonite-rich ironstone; exact identification requires testing

Concrete or artificial stone core sample

Artificial conglomerate

Tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂) with iron-oxide inclusions

Dyed Tumbled Quartz

Silicon Dioxide (SiO2) with artificial pigment

Yellow jasper pebble (possibly iron-stained chert)

Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony

Dyed Agate Geode Slice

Silicon Dioxide (SiO2) - Banded Chalcedony

Likely iron-rich slag or weathered ironstone fragment

Uncertain; possibly iron oxide–rich material (hematite/goethite) or industrial iron slag

Tumbled basalt pebble

Basalt, a fine-grained mafic volcanic rock; commonly plagioclase, pyroxene, and minor olivine or magnetite

Rounded iron-rich concretion or weathered sandstone pebble

Goethite/hematite-bearing sandstone or limonite concretion; exact identification requires testing

Purple Chalcedony (likely dyed Agate)

Silicon Dioxide (SiO2)

Dyed Agate

SiO2 (Silicon Dioxide) - Chalcedony variety

Dyed Agate

Silicon dioxide, SiO2

Sandstone (Nut-stone / Cup-stone artifact)

Quartz Arenite / Worked Sedimentary Rock

Rough Quartz (var. Citrine or Yellow Quartz)

Silicon Dioxide (SiO2)

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - variety of Chalcedony