Mineral With Artificial Coating

Dyed Agate Geode

Silicon Dioxide (SiO2) - Banded Chalcedony

Peridot

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Likely weathered iron-rich rock (possible limonite/goethite-bearing stone)

Limonite–goethite mixture, commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)

Tumbled green aventurine (probable)

Quartz (SiO₂) with fuchsite or other green mica inclusions

Dyed blue chalcedony (likely dyed agate or quartzite)

Chalcedony, microcrystalline SiO₂; blue color likely artificial dye

Dyed pink agate slice

Agate (microcrystalline quartz, SiO₂), commonly chalcedony with artificial dye

Tumbled or naturally weathered quartz-rich stone, possibly iron-stained quartz

Quartz (SiO₂), with yellow-brown iron-oxide staining; exact identification is uncertain from the photograph

Iron-stained quartz

Quartz (SiO₂), likely with limonite/goethite inclusions

Limonite-stained quartz vein in host rock

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

Unidentified brown mineral/rock fragment

Indeterminate from image; possibly iron-stained quartz, feldspar, or weathered limonite

Dragon Vein Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Crackled Quartz (Dyed)

Silicon Dioxide (SiO2)

Weathered jasper pebble (probable red jasper/chert)

Microcrystalline quartz, SiO₂, colored mainly by iron oxides

Sandstone with Manganese Dendrites/Oxide coatings

Arenite with Pyrolusite and Romanechite (MnO2)

Oolitic Chert

Silicon Dioxide (SiO2) with Oolitic texture

Polished blue-green stone, likely chrysocolla or chrysocolla-bearing chalcedony

Chrysocolla: hydrated copper phyllosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; exact identification requires testing

Chrysocolla-bearing copper ore, possibly malachite

Chrysocolla: hydrated copper aluminosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; green bands may be malachite, Cu₂CO₃(OH)₂

Iron-oxide-rich weathered rock

Limonite/goethite-bearing ironstone; chiefly hydrated iron oxides, often FeO(OH)·nH₂O

Ironstone / limonite-rich rock

Limonite, chiefly hydrated iron oxides (FeO(OH)·nH₂O), commonly mixed with goethite and hematite

Milky Quartz Geode with Chlorite

Silicon Dioxide (SiO2) with Chlorite group inclusions

Shale with Limonite/Hematite Staining

Argillaceous sedimentary rock with Iron Oxides (FeO(OH)·nH2O / Fe2O3)

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

Dyed Agate Slice

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Purple Chalcedony (likely dyed Agate)

Silicon Dioxide (SiO2)

Clear Quartz Sphere

Crystalline Silicon Dioxide (SiO2)

Pink Tumbled Agate

Silicon Dioxide (SiO2) with dye

Painted or coated beach pebble

Uncertain; likely quartz-rich sandstone, quartzite, or a rounded silicate pebble with turquoise-colored surface coating

Druzy quartz on a yellow-brown host, likely agate or chalcedony

Quartz, SiO₂; microscopic drusy quartz crystals coating chalcedony

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

Quartz, silicon dioxide (SiO₂)

Quartz Druzy on Matrix

Silicon Dioxide (SiO2)

White quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Desert Varnish on Sandstone

Quartz Arenite with Iron-Manganese Oxide Coating

Quartz Druzy

Crystalline Silicon Dioxide (SiO2)

Quartz-rich pegmatite (milky quartz with feldspar)

Quartz (SiO₂)–feldspar pegmatite, likely containing albite or orthoclase

Native metallic specimen, possibly galena or a sulfide-rich ore fragment

Tentatively galena (lead sulfide, PbS), possibly mixed with iron/copper sulfides

Covellite

Covellite (CuS)

Polished blue copper mineral, likely chrysocolla or dyed howlite

Chrysocolla: hydrated copper phyllosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; visual identification is uncertain from the image

Quartz-bearing feldspathic rock, possibly pegmatite

Granite/pegmatitic granitic rock; primarily quartz (SiO₂) and feldspar

Vesicular basalt (likely weathered lava rock)

Vesicular basalt; primarily plagioclase feldspar, pyroxene, and volcanic glass, with possible iron-oxide alteration

Dyed Agate

Cryptocrystalline variety of Silica (SiO2)

Crackle Agate / Dyed Agate

Agate (Silicon dioxide / SiO2)

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)