Mineral With Artificial Coating

Red quartz crystal cluster (likely iron-stained quartz)

Quartz, silicon dioxide (SiO₂), with hematite/goethite staining or inclusions

Polished red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Vesicular basalt (likely weathered volcanic rock)

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine

Amethyst (Hematoid Quartz)

Silicon Dioxide (SiO2) with Ferric Iron inclusions

Druzy quartz fragment

Quartz, SiO₂, with a coating of tiny quartz crystals

Tumbled peach agate

Microcrystalline quartz (SiO₂), chalcedony variety; likely agate

Peacock Ore (Bournite/Chalcopyrite)

Bornite (Cu5FeS4) or Acid-Treated Chalcopyrite (CuFeS2)

Banded Agate (Dyed)

SiO2 (Silicon Dioxide / Microcrystalline Quartz)

Bornite (Peacock Ore) / Acid-treated Chalcopyrite

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2)

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Botryoidal chrysocolla-rich copper ore

Chrysocolla, hydrated copper phyllosilicate (approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O), likely with malachite and quartz/gangue

Dyed Blue Quartzite

SiO2 (Silicon Dioxide) with artificial colorants

Weathered quartz-bearing rock, possibly granite or pegmatite

Likely quartz–feldspar rock; exact mineral identification is uncertain from the photograph

Native Copper (Tumbled Nugget)

Cu (Native Element)

Rounded quartz-rich pebble

Likely quartzite or quartz-rich sandstone; predominantly SiO₂

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)

Polished brown flint/chert (likely)

Microcrystalline quartz, SiO₂ (chalcedonic flint/chert)

Vesicular basalt (weathered lava rock)

Basalt, chiefly plagioclase and pyroxene with possible olivine; vesicles are gas-bubble cavities

Blue Dyed Agate Geode

Chalcedony (cryptocrystalline Quartz), SiO2

Red Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Hematite/Iron Oxide inclusions

Blue quartz crystal (likely synthetic or coated quartz)

Quartz, silicon dioxide (SiO₂); possible aqua-aura quartz

Quartz Geode (Druzy Quartz)

Silicon Dioxide (SiO2)

Quartz Geode (Druzy)

Crystalline Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Druzy quartz geode fragment

Quartz, SiO₂, with a coating of fine drusy crystals

Likely tumbled sandstone or limestone

Quartz-rich sandstone (possibly calcarenite/limestone)

Malachite specimen

Malachite, Cu₂CO₃(OH)₂, commonly intergrown with chrysocolla and minor copper oxides

Orange Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Green Chalcedony (Batu Akik)

Silicon Dioxide (SiO2)

Quartz vein specimen, likely milky quartz with iron-stained host rock

Quartz (SiO₂), possibly with chalcedony and sulfide/oxide-bearing matrix

Iron-stained Quartz Pebble

Silicon Dioxide (SiO2) with Hematite/Limonite coatings

Quartz Vein (Iron-stained)

Silicon Dioxide (SiO2) with limonite/hematite staining

Tumbled or broken translucent quartz-like fragment

Quartz (silicon dioxide, SiO₂), possibly chalcedony or calcite

Chrysocolla-bearing rock (likely chrysocolla in a host rock)

Chrysocolla, hydrated copper aluminosilicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O

Iron-stained granitic or volcanic rock

Probable weathered granite/granodiorite with iron-oxide alteration; exact identification requires testing

Blue Dyed Agate

Cryptocrystalline Quartz (SiO2)

Pink Dyed Agate (Pink Agate Slice)

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Dyed Pink Agate (Crackled)

Silicon Dioxide (SiO2) - Chalcedony variety

Sphalerite in Matrix (Polished Point)

Zinc sulfide (Zn,Fe)S

Red Sandstone

Ferruginous Sandstone (SiO2 with Iron Oxide impurities)

Quartz Geode Fragment

Silicon Dioxide (SiO2)