Mineral With Artificial Coating

Quartz Geodes and Crystal Clusters

Silicon Dioxide (SiO2)

Dyed Agate

Silicon Dioxide (SiO2)

Tumbled blue-green stone, likely dyed agate

Agate (microcrystalline quartz, SiO₂); blue coloration may be artificial

Quartz with Iron Oxide

Silicon Dioxide (SiO2) with Fe2O3 inclusions

Red Sandstone

Quartzose Sandstone

Painted beach pebble

Unidentified natural pebble; underlying lithology cannot be determined from the image

Yellow Chalcedony (Tumbled/Cabochon)

Silicon dioxide (SiO2)

Botryoidal chalcedony (possibly quartz geode coating)

Microcrystalline quartz, SiO₂; botryoidal chalcedony

Druzy quartz geode slice

Quartz, SiO₂, commonly lining a chalcedony-rich geode

Tumbled goldstone-like quartz pebble

Likely iron-stained quartz or jasper; exact identification requires testing

Iron-stained quartz

Quartz (SiO₂), colored by iron-oxide staining

Iron-stained milky quartz cluster

Quartz (SiO₂), with brown iron-oxide staining

Copper Ore (likely Malachite or Chrysocolla staining)

Copper Secondary Mineral (e.g., Cu2CO3(OH)2)

Quartz with Iron Oxide Inclusions

SiO2 with Fe2O3 impurities

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Red Sandstone

Quartzose Sandstone (Siliciclastic sedimentary rock)

Smelter Slag

Anthropogenic Silicate Slag

Titanium Coated Quartz (Aura Quartz)

Silicon dioxide with titanium vapor deposition (SiO2)

Quartz with Iron Oxide Monzonite or Sandstone contact

Quartz (SiO2) with Limonite/Hematite staining

Tumbled smoky quartz

Quartz (SiO₂), brown smoky variety

Quartz geode with druzy quartz

Silica, SiO₂; microcrystalline chalcedony/quartz lining with iron-oxide staining

Quartz Druzy

Silicon Dioxide (SiO2)

Blue Dyed Quartzite

Silicon Dioxide (SiO2) with artificial pigment

Polished vesicular basalt (likely iron-rich volcanic rock)

Basalt, predominantly plagioclase–pyroxene–olivine; surface may include iron-oxide minerals or metallic-looking infill

Amethyst druzy geode slice

Quartz (SiO₂), purple amethyst variety, with chalcedony and iron-oxide inclusions

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Red Quartz

Silicon Dioxide (SiO2) with Hematite inclusions

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2)

Rainbow Hematite (Titanium-Coated Hematite)

Titanium-treated Hematite (Fe2O3)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Tumbled milky chalcedony (likely common opalite-like quartz)

Chalcedony, microcrystalline SiO₂; possibly pale common opal, hydrated SiO₂·nH₂O

Carnelian

Carnelian (Silicon Dioxide - SiO2 with Hematite impurities)

Likely tumbled quartz or feldspar fragment

Quartz (SiO₂) or feldspar-group silicate

Blue-green copper mineral specimen, likely chrysocolla-bearing rock

Chrysocolla, hydrated copper silicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possibly mixed with quartz or turquoise

Likely chrysocolla-bearing rock (blue-green copper mineral)

Chrysocolla, Cu₂H₂O₅Si (often mixed with malachite, quartz, or iron oxides)

Sandstone (Red Sandstone)

Arenite (SiO2 based with Fe2O3 staining)

Malachite (possibly chrysocolla-bearing)

Malachite, Cu₂CO₃(OH)₂; the blue-green areas may include chrysocolla, Cu₂H₂Si₂O₅(OH)₄

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)

Iron-stained quartz-rich rock (likely ironstone/quartz vein material)

Quartz (SiO₂) with iron oxides/hydroxides, likely limonite/goethite; precise rock type cannot be confirmed visually

Botryoidal calcite (likely calcite concretion)

Calcite, calcium carbonate (CaCO₃)

Likely dyed pink quartz or agate fragment

Quartz, SiO₂ (identity uncertain from the image)