Mineral With Artificial Coating

Dyed and polished agate slice

Agate, a banded microcrystalline variety of chalcedony (SiO₂), commonly quartz with minor impurities

Dyed and polished agate pebble

Microcrystalline quartz (SiO₂), likely chalcedony/agate with blue dye

Tumbled orange chalcedony or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper

Vesicular basalt (likely weathered lava rock)

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

Ferruginous Quartz

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Druzy Quartz

Silicon Dioxide (SiO2)

Red Quartz

Silicon Dioxide (SiO2) with Hematite inclusions

Quartz-rich pegmatite (milky quartz with feldspar)

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

Smoky Quartz

Smoky Quartz (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

SiO2 (Silicon Dioxide)

Peridot

Olivine ((Mg, Fe)2SiO4)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Desert Varnish on Sandstone

Quartz Arenite with Iron-Manganese Oxide Coating

Quartz Druzy on Matrix

Silicon Dioxide (SiO2)

Blue glassy mineral fragment, possibly sodalite or dyed/cobalt glass

Uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) if natural, but vivid blue color may indicate cobalt-colored glass

Shale with Limonite/Hematite Staining

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

Iron-Stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide impurities

Red Sandstone

Sandstone (Iron Oxide Rich)

Likely druzy quartz/agate specimen

Quartz (SiO₂), possibly iron-stained chalcedony or agate

Likely weathered brown rock fragment

Indeterminate; possibly iron-oxide-stained sandstone or laterite

Milky Quartz Geode with Chlorite

Silicon Dioxide (SiO2) with Chlorite group inclusions

Quartz-rich pegmatite with iron-stained quartz

Quartz (SiO₂) in granitic pegmatite, likely with feldspar and iron-oxide staining

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

Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Quartz Druzy (on Matrix)

Silicon Dioxide (SiO2)

Aura Quartz

Titanium or Gold bonded Silicon Dioxide (SiO2)

Botryoidal chalcedony (possible agate or silica sinter)

Microcrystalline quartz, SiO₂

Covellite

Covellite (CuS)

Quartz-rich rock, possibly iron-stained quartz or quartzite

Quartz (SiO₂), potentially quartzite with iron-oxide staining

Polished smoky quartz point

Quartz, silicon dioxide (SiO₂), likely smoky variety

Aura Rose Quartz

SiO2 (Silicon Dioxide with Titanium/Gold coating)

Druzy Quartz on Chalcedony Matrix

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Tumbled quartz bead bracelet

Quartz (SiO₂), likely milky or rose quartz

Clear Quartz Sphere

Crystalline Silicon Dioxide (SiO2)

Pink Tumbled Agate

Silicon Dioxide (SiO2) with dye

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2)

Golden Healer Quartz

Silicon Dioxide (SiO2) with limonite/hematite inclusions