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

Slag Glass (Cullet Glass)

Amorphous Silica (Industrial byproduct)

Orange chalcedony or weathered quartz pebble

Microcrystalline quartz, SiO₂; possibly iron-oxide-stained chalcedony

Obsidian (likely black obsidian)

Volcanic glass; chiefly silica-rich rhyolitic composition, approximately SiO₂ 70–75%

Ruby in Zoisite (Anyolite) or possibly a dyed stone/agate

Anyolite (Ruby in green zoisite) or artificially altered chalcedony

Heat-Treated Citrine (Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Dyed Agate

Microcrystalline Quartz (SiO2) with artificial pigment

Tumbled yellow jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

Polished carnelian or red jasper

Cryptocrystalline quartz (chalcedony), SiO₂; possibly iron-rich jasper

Weathered vesicular volcanic rock, likely scoria

Scoria; composition commonly basaltic to andesitic

Possible basalt or volcanic scoria fragment

Mafic volcanic rock, likely basalt; exact identification is uncertain from the photograph

Aura Quartz (Coated Quartz)

Silicon Dioxide (SiO2) coated with vaporized metals

Dyed Howlite (Dyed Red)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Brecciated jasper with quartz/chalcedony

Jasper (microcrystalline quartz, SiO₂), with chalcedony and iron-oxide matrix

Red agate (possibly dyed chalcedony)

Chalcedony, microcrystalline SiO₂; agate is banded chalcedony

Small rounded pebble, likely weathered sandstone or iron-stained sedimentary rock

Indeterminate; probable quartz-rich sandstone (SiO₂ with clay/iron-oxide cement)

Likely vesicular basalt

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase, pyroxene, and sometimes olivine

Blue chalcedony crystal pendant

Chalcedony, microcrystalline quartz (SiO₂), likely blue chalcedony or dyed quartz

Heat-Treated Citrine

Silicon Dioxide (SiO2) with iron impurities

Likely yellow quartz gemstone ring

Quartz (SiO₂), possibly heat-treated citrine or lemon quartz; metal setting appears to be brass/gold-colored alloy

Polished black stone, likely black jasper or basalt

Microcrystalline quartz (SiO₂) if jasper; alternatively fine-grained basalt

Blue Slag Glass

Amorphous Silica (Byproduct of smelting)

Tumbled brown chert or jasper

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

Red Jade (Dyed Quartzite)

Silicon Dioxide (SiO2) - variety Quartzite

Blue Glass / Slag Glass

Amorphous silicon dioxide (SiO2) with cobalt colorants

Polychrome Jasper

Silicon Dioxide (SiO2) with iron and other mineral inclusions

Unidentified purple mineral fragment

Possibly amethyst (quartz), but the image is insufficient for confident identification

Small tumbled brown stone, likely iron-stained quartz or jasper

Quartz (SiO₂) or microcrystalline quartz (chalcedony/jasper), identification uncertain from the image

Polished ocean jasper / orbicular jasper

Silicified rhyolite or chalcedony-rich microcrystalline quartz (SiO₂), commonly sold as ocean jasper

Chert (specifically Blue Chert/Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)

N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)

Dyed or coated quartz/amethyst specimen (likely)

Quartz, SiO₂; purple portion may be amethyst, iron-bearing quartz

Purple Agate (Dyed Chalcedony)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Smoky Quartz

SiO2 (Silicon Dioxide)

Jasper Pebble

Microcrystalline Quartz (SiO2)

Crackle Agate / Dyed Agate

Agate (Silicon dioxide / SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) - variety Jasper

Slag (Industrial Glassy Byproduct)

Ferro-silicate Slag

Tumbled jasper (likely brecciated or leopard jasper)

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

Jasper / Chert Pebble

Microcrystalline Quartz (SiO2)

Likely tumbled yellow jasper or iron-rich chert

Microcrystalline quartz (SiO₂), colored by iron oxides

Quartzite with Iron Inclusions

Quartzite (pre d om i n a n t l y SiO2) with H e m a t i t e / G o e t h i t e

Tumbled jasper (likely picture/brecciated jasper)

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides