Mineral With Artificial Coating

Conglomeratic gravel / pebble-rich concrete-like rock

Polymictic conglomerate (likely an unconsolidated gravel surface; exact identification uncertain from the image)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Limonite/goethite-rich ironstone

Hydrated iron oxides, chiefly goethite (α-FeO(OH)) and limonite (FeO(OH)·nH₂O)

Sphalerite in Matrix (Polished Point)

Zinc sulfide (Zn,Fe)S

Weathered copper-bearing sulfide rock (likely bornite/chalcopyrite)

Bornite (Cu5FeS4) and/or chalcopyrite (CuFeS2), with oxidation tarnish

Weathered brown rock fragment

Indeterminate; possibly ferruginous sandstone or weathered volcanic rock

Quartz Druzy Geode Fragment

Silicon Dioxide (SiO2)

Granite

Granite (Plutonic Igneous Rock)

Green Aventurine

Aventurine Quartz (SiO2)

Peacock Ore

Bornite (Cu5FeS4)

Dalmatian Stone

Peralkaline igneous rock containing quartz, feldspar, and arfvedsonite

Botryoidal hemimorphite on matrix

Hemimorphite, Zn₄Si₂O₇(OH)₂·H₂O, likely with associated quartz or calcite

Likely tumbled quartz-rich pebble

Quartz (SiO₂), possibly a weathered quartzite or chalcedony pebble

Moqui Marble (Shaman Stone)

Iron Oxide Concretion (Hematite/Goethite shell with Sandstone core)

Glacial erratic boulder, probably granite or granitic gneiss

Granite–gneiss; mainly quartz, feldspar, and mica

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂), with green mica/fuchsite or chlorite inclusions

Citrine (Heat-Treated Amethyst)

Quartz (SiO2)

Likely weathered granite or granitic gneiss fragment

Quartz–feldspar–mica aggregate; possibly biotite granite or gneiss

Hematoid Quartz

Silicon Dioxide with Iron Oxide Inclusions (SiO2 + Fe2O3)

Unknown metallic sulfide-bearing rock, possibly chalcopyrite or bornite

Tentative: chalcopyrite (CuFeS₂) or bornite (Cu₅FeS₄)

Orange chalcedony or weathered quartz pebble

Microcrystalline quartz, SiO₂; possibly iron-oxide-stained chalcedony

Dyed Blue Agate Slice

Silicon Dioxide (SiO2)

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - variety of Chalcedony

Dyed Blue Agate

Cryptocrystalline Quartz (SiO2)

Dyed Blue Quartzite

SiO2 (Silicon Dioxide) with artificial colorants

Chrysocolla-bearing copper ore

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

River Rock (Mossy)

Stream-rounded Clast (likely Siltstone or Sandstone with bryophytes)

Chalcedony breccia (possibly agate with drusy quartz)

Microcrystalline quartz, SiO₂, with crystalline quartz and dark matrix/inclusions

Likely labradorite-bearing rocks

Labradorite, a plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈), possibly in mafic host rock

Botryoidal chalcedony (possibly common opal)

Microcrystalline quartz, SiO₂; pale portions may include hydrated silica opal, SiO₂·nH₂O

Tumbled quartz pebble

Quartz (SiO₂), likely milky or iron-stained quartz

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Quartz-rich pegmatite or quartz vein rock

Mostly quartz (SiO₂), with probable feldspar and iron-oxide staining

Sandstone (Iron-stained Pebble)

Sandstone (Quartz/Hematite dominated)

Likely quartz crystal fragment

Quartz (silicon dioxide, SiO₂)

Orange Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartz Druzy (on Calcedony/Quartz base)

Silicon Dioxide (SiO2)

Pink Quartz (likely dyed)

Silicon Dioxide (SiO2)

Weathered iron-rich rock, possibly oxidized basalt or laterite

Indeterminate; likely iron-oxide-bearing mafic rock (basaltic composition)

Quartz-rich mineral specimen, possibly druzy quartz

Quartz (silicon dioxide, SiO₂), possibly with minor calcite or feldspar

Weathered pegmatitic granite or feldspar-rich metamorphic rock

Quartz–feldspar rock, likely granitic pegmatite; exact identification requires testing