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

Purple Agate (Dyed Chalcedony)

SiO2 (Silicon Dioxide) with organic dyes

Aura Quartz Bead

Silicon dioxide (SiO2) with metal coating

Slag Glass

Silicon dioxide with impurities

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

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

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

Citrine Quartz

Silicon Dioxide (SiO2)

Tumbled chalcedony or quartz fragment

Microcrystalline quartz, SiO₂ (probable chalcedony)

Tumbled chert or flint pebble

Microcrystalline quartz (SiO₂), likely chert/flint

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Iron-rich chert or jasper

Microcrystalline quartz (SiO₂), colored by hematite/goethite inclusions

Dyed Dalmatian Stone (Dalmatian Jasper)

Aplite (predominantly quartz, feldspar, and arfvedsonite)

Uncertain fine-grained rock or mineral-bearing specimen

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

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Dyed Agate

SiO2 (Silicon Dioxide)

Blue Dyed Quartzite

Silicon Dioxide (SiO2) with artificial pigment

Tumbled brown chalcedony or jasper

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

Tumbled quartz-rich stone, possibly smoky quartz or chert

Uncertain; likely microcrystalline quartz, SiO₂

Vesicular basalt (scoria-like volcanic rock)

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

Tumbled brown jasper or chert pebble

Microcrystalline quartz (SiO₂), likely jasper/chert

Rough Quartz (var. Citrine or Yellow Quartz)

Silicon Dioxide (SiO2)

Dyed Agate

Silicon dioxide, SiO2

Dyed Agate Geode Slice

Silicon Dioxide (SiO2) - Banded Chalcedony

Purple Chalcedony (likely dyed Agate)

Silicon Dioxide (SiO2)

Dyed Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial pigment

Pink Dyed Agate

Silicon Dioxide (SiO2) - Variety Agate

Possible iron-rich concretion or weathered ironstone

Goethite/limonite-rich ironstone; exact identification requires testing

Slag

Anthropogenic Vitreous Silicate / Ferro-silicate Slag

Red Tiger's Eye

Pseudomorph of Quartz after Crocidolite (Silicon Dioxide: SiO2)

Peacock ore (iridescent bornite/chalcopyrite)

Bornite (Cu₅FeS₄), commonly sold as heat-treated chalcopyrite (CuFeS₂)

Amethyst (Cabochon)

Silicon Dioxide (SiO2) with iron impurities

Dyed Agate

SiO2 (Silicon Dioxide) - Chalcedony variety

Tumbled basalt pebble

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

Sandstone (Nut-stone / Cup-stone artifact)

Quartz Arenite / Worked Sedimentary Rock

Dyed Pumice

Vesicular Rhyolite (Artificial Coloration Addition)

Tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂) with iron-oxide inclusions

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - variety of Chalcedony

Dyed Pink Quartzite

Tumbled and Dyed Quartzite (SiO2 with dye treatment)

Iron Slag

Anthropogenic Ferro-silicate

Dyed Quartzite

Metamorphosed Quartz (SiO2) with synthetic pigment

Rounded iron-rich concretion or weathered sandstone pebble

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

Dyed Blue Agate

Silicon Dioxide (SiO2) with artificial pigment

Aura Quartz (Coated Quartz)

Silicon Dioxide (SiO2) treated with metallic vapor