Sedimentary (Artificial)

Slag (Industrial Byproduct)

Artificial silicate/iron byproduct

Tumbled brown jasper / chert

Microcrystalline quartz (SiO₂), commonly called jasper or brown chert

Concrete aggregate surface

Human-made cementitious composite; primarily calcium-silicate-hydrate cement with mixed silicate aggregate

Weathered stone, likely sandstone or altered volcanic rock

Indeterminate; possibly quartz-rich sandstone or weathered tuff

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Conglomeratic aggregate / pebble-rich concrete-like rock

Polymictic conglomerate (likely glacial or beach-derived gravel matrix); exact identification uncertain from image

Dyed Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Polished lapis lazuli

Lapis lazuli: lazurite-rich rock, chiefly Na3Ca(Si3Al3)O12S; commonly contains calcite and pyrite

Tumbled amethyst

Amethyst, purple variety of quartz (SiO₂)

Blue Agate Geode Slice

Silicon Dioxide (SiO2) - Chalcedony variety

Dyed Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Painted River Pebble (likely Basalt or Greywacke)

Aphanitic Lithic Clast with Anthropogenic Pigment coating

Rounded sandstone pebble

Quartz-rich sandstone (primarily quartz, with feldspar and iron-oxide cement)

Dyed Agate

SiO2

Titanium Quartz (Aura Quartz)

Silicon Dioxide (SiO2) treated with Titanium

Red Dyed Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Dyed and Crackle Agate

Silicon dioxide (chalcedony, SiO2)

Green Agate

Silicon Dioxide (Chalcedony), SiO2

Dyed Quartz Crystals

Silicon Dioxide (SiO2) with artificial pigment

Polished sedimentary pebble, likely sandstone or quartzite

Quartz-rich sandstone (SiO₂-dominant), possibly weakly metamorphosed quartzite

Dyed Blue Agate Slice

Chalcedony (Silicon Dioxide, SiO2)

Dyed Agate Slice

Silicon Dioxide (SiO2) - Chalcedony variety

Pyrite

Iron Sulfide (FeS2)

Tumbled red jasper

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

Ferrochrome Slag

Anthropogenic silicate/oxide glass (Complex silicate matrix with Cr-Fe-Si inclusions)

Purple Tiger's Eye

Silicon dioxide with crocidolite inclusions (SiO2)

Likely vertebra fossil or bone fragment

Indeterminate fossilized vertebra; mineralized hydroxyapatite, commonly Ca₅(PO₄)₃(OH)

Hag Stone (Odin Stone / Adder Stone)

Perforated Pebble (commonly Chert, Mudstone, or Limestone)

Dyed Pink Agate Slice

Cryptocrystalline variety of Quartz (SiO2)

Yellow jasper pebble (possibly iron-stained chert)

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

Blue Topaz

Al2SiO4(F,OH)2

Likely polished black-and-white stone fragment

Indeterminate from image; possibly tourmalinated quartz, black-and-white jasper, or coated stone

Dyed Agate

Silicon dioxide (SiO2) with artificial colorant

Purple Chalcedony (likely dyed Agate)

Silicon Dioxide (SiO2)

Tumbled Agate (Dyed Blue)

Silicon Dioxide (Chalcedony variety)

Dyed Quartz Crystal

Silicon Dioxide (SiO2) with artificial pigment

Likely weathered quartz-rich rock fragment

Uncertain; possibly quartz sandstone or a pale feldspathic rock

Dyed Purple Agate Sliced Tablet

Silicon Dioxide (SiO2), variety Chalcedony

Yellow Chalcedony (Tumbled/Cabochon)

Silicon dioxide (SiO2)

Likely tumbled sandstone or limestone

Quartz-rich sandstone (possibly calcarenite/limestone)

Tumbled carnelian (orange chalcedony)

Carnelian, a microcrystalline variety of quartz; silicon dioxide (SiO₂) colored mainly by iron oxides

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)