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

Native American Hammerstone / Pitted Stone

Modified lithic artifact (often quartzite, basalt, or granite)

Lemon Quartz

Silicon Dioxide (SiO2)

Asphalt aggregate (crushed stone in bitumen)

Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen

Blue metallic mineral specimen, possibly bornite or chalcopyrite

Bornite (Cu₅FeS₄) or chalcopyrite (CuFeS₂); exact identification requires testing

Red jasper (tumbled)

Jasper, microcrystalline quartz/chalcedony (SiO₂) colored mainly by iron oxides

Blue Slag Glass

Amorphous Silica (Industrial byproduct)

Dyed Pink Agate

Silicon Dioxide (SiO2) with artificial dye

Tumbled quartz-rich pebble, likely jasper or chert

Microcrystalline quartz (SiO₂), possibly iron-stained jasper

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Tumbled brown agate or jasper pebble

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

Green Obsidian Sphere (man-made glass)

Vitreous Silica with Chromium/Iron additives

Dragon Vein Agate (Dyed/Fractured Quartz)

Silicon dioxide (SiO2)

Orbicular jasper (ocean jasper-like jasper)

Microcrystalline quartz (SiO₂), commonly with iron-oxide and clay inclusions

Jasper

Silicon dioxide (SiO2) microcrystalline quartz

Concrete Fragment

Artificial Conglomerate (Cement and Aggregate)

Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)

Amorphous Silicon Dioxide (SiO2) with chemical additives (e.g., Cobalt for blue color)

Blue chalcedony (likely dyed or coated)

Microcrystalline quartz, SiO₂ (chalcedony)

Likely tumbled jasper or agate

Microcrystalline quartz (SiO₂), possibly iron-rich jasper

Blue obsidian-like volcanic glass

Volcanic glass, chiefly silica-rich amorphous material (composition uncertain)

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

Tumbled yellow quartz (likely citrine or iron-stained quartz)

Quartz, SiO₂; yellow color may result from iron staining, but the photo cannot confirm citrine

Man-made Slag (Industrial Byproduct)

Anthropogenic Glassy Residue

Aura Quartz Geode (Angel Aura Quartz)

Silicon Dioxide (SiO2) bonded with precious metals

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2) with artificial pigment

Tumbled chalcedony/agate (likely botryoidal variety)

Microcrystalline quartz, SiO₂; possibly druzy chalcedony or common agate

Possible industrial slag or basaltic volcanic glass

Likely iron-rich vitreous slag; natural alternative: basaltic glass (tachylite)

Dyed Agate

Chalcedony (Silicon Dioxide, SiO2)

Blue Agate

Silicon dioxide (Chalcedony), SiO2

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Dyed Tumbled Quartz

Silicon Dioxide (SiO2)

Dyed Agate

SiO2

Dark tumbled stone, possibly basalt

Basalt (fine-grained mafic volcanic rock; identification tentative from the image)

Green Tiger's Eye

Silicon dioxide with crocidolite inclusions (SiO2)

Blue Dyed Agate Geode (Slice)

Silicon Dioxide (SiO2) - Chalcedony / Quartz

Vesicular iron-rich slag or weathered metallic ore

Indeterminate; likely Fe-oxide-bearing slag (magnetite/hematite) rather than a specific natural mineral

Blue Goldstone

Man-made glass infused with copper crystals

Weathered iron-rich rock, possibly jasper or ironstone

Likely limonite/goethite-bearing siliceous rock; exact identification requires hardness and streak tests

Peacock ore (bornite/chalcopyrite specimen)

Bornite, Cu₅FeS₄, commonly with chalcopyrite (CuFeS₂)

Possible weathered basalt or slag fragment

Basalt, chiefly plagioclase and pyroxene; identification is uncertain from the image

Jasper

Microcrystalline Quartz (SiO2)

Slag (Industrial Glass)

Anthropogenic Vitreous Slag (Post-industrial byproduct)

Peridot (likely, given the color and bead form)

Olivine, variety Peridot (Mg,Fe)2SiO4