Sedimentary (Artificial)

Polished leopard jasper (likely ocean jasper)

Silicified microcrystalline quartz/chalcedony; mainly SiO₂ with iron-oxide inclusions

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

Purple Agate (Dyed Chalcedony)

SiO2 (Silicon Dioxide) with organic dyes

Tumbled amethyst

Amethyst, purple variety of quartz (SiO₂)

Polished lapis lazuli

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

Blue Agate Geode Slice

Silicon Dioxide (SiO2) - Chalcedony variety

Blue Agate (Dyed Chalcedony)

Silicon Dioxide (SiO2)

Weathered stone, likely sandstone or altered volcanic rock

Indeterminate; possibly quartz-rich sandstone or weathered tuff

Concrete aggregate surface

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

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O

Titanium Quartz (Aura Quartz)

Silicon Dioxide (SiO2) treated with Titanium

Red Dyed Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Dyed Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Ferrochrome Slag

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

Rounded sandstone pebble

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

Tumbled brown jasper / chert

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

Polished sedimentary pebble, likely sandstone or quartzite

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

Dyed Pink Agate Slice

Cryptocrystalline variety of Quartz (SiO2)

Tumbled red jasper

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

Dyed Blue Agate Slice

Chalcedony (Silicon Dioxide, SiO2)

Dyed Agate Slice

Silicon Dioxide (SiO2) - Chalcedony variety

Dyed Agate

SiO2

Painted River Pebble (likely Basalt or Greywacke)

Aphanitic Lithic Clast with Anthropogenic Pigment coating

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 Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Dyed Quartz Crystal

Silicon Dioxide (SiO2) with artificial pigment

Dyed Blue Agate

Chalcedony (SiO2) with artificial dye

Pink Dyed Agate

Chalcedony (SiO2) with artificial dyes

Blue Dyed Agate

Chalcedony (SiO2) with artificial pigment

Slag (Industrial Byproduct)

Artificial silicate/iron byproduct

Dyed Purple Agate Sliced Tablet

Silicon Dioxide (SiO2), variety Chalcedony

Tumbled Agate (Dyed Blue)

Silicon Dioxide (Chalcedony variety)

Likely tumbled sandstone or limestone

Quartz-rich sandstone (possibly calcarenite/limestone)

Dyed Quartz Crystals

Silicon Dioxide (SiO2) with artificial pigment

Likely polished black-and-white stone fragment

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

Purple Chalcedony (likely dyed Agate)

Silicon Dioxide (SiO2)

Yellow Chalcedony (Tumbled/Cabochon)

Silicon dioxide (SiO2)

Tumbled carnelian (orange chalcedony)

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

Dyed Howlite (Turquenite)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)