Mineral With Artificial Coating

Basalt with pale mineral veins/coating

Likely vesicular or altered basalt, with calcite or zeolite minerals

Dyed Agate (Tumbled)

Silicon Dioxide (Chalcedony variety, artificially dyed)

Iron-Stained Quartz (Red Quartz)

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Dragon Vein Agate (Dyed)

SiO2

Dzi Bead (Agate Bead)

Cryptocrystalline Quartz (SiO2) - Chalcedony/Agate

Rounded quartz-rich pebble

Likely quartzite or quartz-rich sandstone; predominantly SiO₂

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)

Sedimentary Sandstone with Iron Oxide

Ferruginous Sandstone

Botryoidal chalcedony (possibly quartz geode coating)

Microcrystalline quartz, SiO₂; botryoidal chalcedony

Quartz (likely milky quartz or quartz glass-like fragment)

Quartz, silicon dioxide (SiO₂)

Red Sandstone

Arenite (SiO2 with Fe2O3)

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)

Iron-stained Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Red Quartz

Silicon Dioxide (SiO2) with Hematite inclusions

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2)

Quartz with Iron Oxide

Silicon Dioxide (SiO2) with Fe2O3 inclusions

Uncertain dark metallic mineral specimen

Possibly galena (lead sulfide, PbS), though the image is too blurred for reliable identification

Likely quartz-bearing rock or mineral fragment

Probable quartz (SiO₂), possibly a weathered pegmatite or chalcedony fragment

Iron-stained quartz-rich rock fragments

Likely quartz (SiO₂) with limonite/goethite iron oxides; possibly quartzite or silicified rock

Quartz Geode (Druzy Quartz)

Silicon Dioxide (SiO2)

Quartz Geode (Druzy)

Crystalline Silicon Dioxide (SiO2)

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

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

Aggregate Concrete

Anthropogenic Conglomerate (Technosol)

Earthy iron-oxide-rich mineral coating (probable laterite/limonite)

Hydrated iron oxides and oxyhydroxides, chiefly goethite (FeO(OH)) and limonite (variable FeO(OH)·nH₂O), mixed with clay/sand

Pumice or vesicular volcanic rock

Pumice; predominantly volcanic glass (silica-rich, commonly rhyolitic to dacitic)

Crackle Agate / Dyed Agate

Agate (Silicon dioxide / SiO2)

Quartz with Iron Staining

Crystalline Silicon Dioxide (SiO2)

Tiny amber-colored crystal or mineral fragment

Indeterminate from image; possibly quartz, citrine, topaz, or iron-stained feldspar

Banded Agate (Dyed)

Silicon Dioxide (SiO2) with impurities

Orange Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Pink Dyed Agate Geode Slice

Cryptocrystalline Quartz (SiO2)

Tumbled blue-green stone, likely chrysocolla or dyed chalcedony

Probable chrysocolla (hydrated copper aluminosilicate; variable composition), though appearance could also represent dyed chalcedony

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Quartz Druzy on Matrix

Silicon Dioxide (SiO2)

Amethyst cluster

Quartz, purple variety; silicon dioxide (SiO₂) colored mainly by iron-related defects and irradiation

Aura Quartz (Titanium/Gold coated)

Silicon Dioxide (SiO2) with metallic vapor deposition

Iron-stained quartz vein fragment

Quartz (SiO₂), likely with limonite/goethite iron oxides and minor sulfides