Mineral With Artificial Coating

Druzy quartz, possibly amethyst-bearing

Quartz (SiO₂), with purple coloration potentially from trace iron; exact variety is uncertain from the photo

Quartz-bearing weathered rock, possibly quartzite or quartz vein fragment

Quartz (SiO₂), with iron-oxide staining and likely feldspathic impurities

Quartz Druze (Crystalline Quartz)

Silicon Dioxide (SiO2)

Iron-stained quartz vein rock

Quartz-rich vein material with iron oxides/hydroxides (quartz, SiO₂, stained by hematite/goethite); likely hosted in a metamorphic rock

Graphite

Graphite (Carbon, C)

Iron-stained quartz-rich rock

Likely quartz-feldspar rock (granite or pegmatite) with iron-oxide staining

Dark, rounded rock (possibly basalt)

Undetermined; basalt is a tentative visual identification

Pale blue-gray quartz-rich pebble (tentative)

Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment

Quartz (Druzy)

Silicon Dioxide (SiO2)

Green sea glass (likely bottle glass)

Man-made soda-lime silicate glass; not a natural mineral

Likely iron-stained quartz pebble

Quartz (SiO₂), possibly with iron-oxide staining

Iron-stained milky quartz pebble

Quartz (SiO₂), with iron-oxide/hydroxide staining; exact identification is uncertain from the image

Banded Agate (Dyed / Polished)

Microcrystalline Quartz (SiO2)

Dyed Agate Geode (Pink/Magenta)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Druzy Quartz on Chert/Chalcedony

Silicon Dioxide (SiO2)

Dyed Agate

SiO2 (Silicon Dioxide)

Lemon Quartz (Orizaba/Citrinated Quartz)

Silicon Dioxide (SiO2) with iron impurities/treatment

Polished malachite

Malachite, Cu₂CO₃(OH)₂

Red Sandstone (Siltstone Pebble)

Arenite / Siltstone with Iron Oxide (Fe2O3)

Psilomelane (Manganese Ore)

Psilomelane (Ba,H2O)2Mn5O10

Iron-stained milky quartz

Quartz (SiO₂) with iron-oxide/hydroxide staining, likely limonite/goethite

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Blue Lace Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

Dyed Howlite (simulating Lavender/Purple Jade or Charoite)

Howlite: Ca2B5SiO9(OH)5 (when natural)

Blue Howlite

Dyed Howlite (Ca2B5SiO9(OH)5)

Druzzy Quartz on Matrix

Silicon Dioxide (SiO2)

Lemon Quartz

Silicon Dioxide (SiO2)

Kaolinite-rich claystone (kaolin)

Kaolinite, Al₂Si₂O₅(OH)₄, likely in a clay-rich rock

Druzy Quartz on Ironstone

Silicon Dioxide (SiO2) on Limonitic Ironstone

Polished blue lace agate slice

Chalcedony (microcrystalline quartz), SiO₂, commonly with blue-gray banding and a druzy quartz center

Pink Banded Agate (Dyed)

Chalcedony (cryptocrystalline silica), chemical formula SiO2

Red chalcedony (likely dyed or heat-treated)

Microcrystalline quartz, SiO₂; possibly red agate/carnelian

Dyed Quartzite (Pink/Magenta)

Silicon Dioxide (SiO2) - Artificially Colored Quartzite

Sandstone with Mineral Veining or Crust

Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)

Likely smoky quartz pendant

Smoky quartz, silicon dioxide (SiO₂), quartz variety colored by irradiation-related defects

Likely tumbled jasper or agate

Microcrystalline quartz (SiO₂), possibly iron-rich jasper

Dyed agate geode slice

Banded chalcedony (microcrystalline SiO₂), commonly sold as a dyed agate slice

Tooth or shell fragment (likely fossilized marine material)

Indeterminate; possibly a fossil fish tooth or mollusk shell fragment composed mainly of calcium carbonate (CaCO₃)

Clear Quartz with Limonite

Silicon Dioxide (SiO2) with Hydrated Iron Oxides

Druzy Quartz on Matrix

Silicon Dioxide (SiO2)

Dyed Agate

Chalcedony (Silicon Dioxide, SiO2)

Druzy quartz in agate/geode

Quartz (SiO₂), microcrystalline chalcedony host