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

Tumbled amber-colored mineral or glassy pebble

Uncertain; likely chalcedony/quartz, possibly resinous amber or slag glass

Citrine quartz crystal

Quartz, silicon dioxide (SiO₂); yellow variety commonly called citrine

Small dark rock fragment

Uncertain; possibly weathered basalt or slag

Likely tumbled brown stone

Indeterminate; possibly jasper, chert, or iron-stained quartzite

Red jasper beads

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored red by iron oxides

Likely silicon carbide (carborundum)

Synthetic silicon carbide (SiC), likely blue-green crystalline grit

Tumbled jasper (likely brecciated or red jasper)

Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions

Peacock ore (likely chalcopyrite-bornite specimens)

Iridescent chalcopyrite, CuFeS₂, commonly altered to bornite, Cu₅FeS₄

Bismuth crystal

Bismuth (Bi), artificially crystallized

Dyed Agate

Chalcedony (SiO2)

Weathered basalt pebble

Basalt, a mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine and iron-titanium oxides

Tumbled smoky quartz

Quartz (SiO₂), smoky variety

Leland Blue Stone

Anthropogenic Iron Smelting Slag

Small dark rock fragment (likely basalt or slag)

Tentatively basalt; exact identification is uncertain from the photograph

Polished mahogany obsidian

Volcanic glass; predominantly rhyolitic silica glass (SiO₂-rich)

Jasper

Silicon Dioxide (SiO2) with impurities

Dark rounded pebble, likely basalt or slag

Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag

Blue chalcedony (likely dyed or coated)

Chalcedony, microcrystalline quartz (SiO₂)

Dyed and polished agate pebble

Microcrystalline quartz (SiO₂), likely chalcedony/agate with blue dye

Brecciated Jasper

SiO2 (Silicon Dioxide)

Red Jasper (Beach Pebble)

Jasper (Cryptocrystalline Quartz, SiO2)

Peacock Ore

Bornite (Cu5FeS4)

Likely weathered iron-rich rock or slag fragment

Uncertain; possibly limonite/goethite-rich material (FeO(OH)·nH₂O)

Heat-Treated Citrine (Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Red jasper / iron-rich chert

Microcrystalline quartz (SiO₂) colored by hematite/goethite

Dyed red crystal aggregate, likely quartz or salt

Uncertain; possibly dyed quartz (SiO₂) or halite (NaCl)

Blue Quartzite (Dyed Quartzite)

Quartzite (SiO2 with dye enhancements)

Blue Dyed Agate Geode

Chalcedony (cryptocrystalline Quartz), SiO2

Iron-rich chert or jasper fragment

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

Green Slag Glass

Amorphous Silica / Glassy Blast Furnace Slag

Smoky Quartz

Silicon Dioxide (SiO2)

Jasper and Agate

Microcrystalline Quartz (SiO2)

Dyed tumbled stone, likely chalcedony or quartz

Microcrystalline quartz (SiO₂), probably dyed magenta

Polished chrysoprase (likely dyed or treated)

Chalcedony, cryptocrystalline quartz (SiO₂), colored green by nickel

Dark gray rounded stone, possibly basalt or slag

Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or iron-rich industrial slag

Green cabochon gemstone, likely aventurine or dyed chalcedony

Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony

Tumbled chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper

Tumbled jasper (likely brecciated or red jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

Dyed blue chalcedony (likely dyed agate or quartzite)

Chalcedony, microcrystalline SiO₂; blue color likely artificial dye

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Likely tumbled yellow-orange mineral or glassy stone

Indeterminate from photograph; possibilities include yellow jasper, calcite, agate, or dyed quartz

Dalmation Stone (Dalmation Jasper)

Peralkaline Rock with Feldspar and Arfvedsonite