Mineral With Artificial Coating

Small blue-gray mineral fragment (undetermined)

Unidentified from the image; no reliable mineral identification is possible from color and appearance alone.

Likely brown ironstone or limonite-rich rock fragment

Ironstone, chiefly iron oxides/hydroxides such as goethite (α-FeO(OH)) and limonite

Malachite (probable)

Malachite, Cu₂CO₃(OH)₂

Small brown mineral specimen, possibly mica-bearing rock

Unidentified from the image; exact mineral species cannot be determined at this scale

Quartz-rich feldspathic rock, possibly weathered granite or quartzite

Likely quartz and feldspar aggregate; exact identification is uncertain from the photograph

Sandstone (River Rock)

Arenite (composed primarily of SiO2)

Iron-stained Quartz

Silicon Dioxide (SiO2)

Ironstone Matrix with Jasper / Chert

Ferruginous Chert / Limonitic Jasper (SiO2 with Fe-oxides)

Iron-stained quartz vein in altered host rock

Quartz (SiO₂) with iron oxides/hydroxides, likely hematite and goethite; host rock uncertain from the image

Smoky Quartz

SiO2 (Silicon Dioxide)

Peridot

Olivine ((Mg, Fe)2SiO4)

Smoky Quartz

Smoky Quartz (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Dyed Blue Agate Slice

Chalcedony (Silicon Dioxide, SiO2)

Dyed Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Red Jade (Dyed Quartzite)

Silicon Dioxide (SiO2) - variety Quartzite

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2)

Quartz geode or quartz-bearing rock

Quartz (SiO₂), likely in a chalcedony- or basalt-hosted cavity

Druzy quartz geode

Quartz, silicon dioxide (SiO₂), microcrystalline druzy coating

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with hematite/limonite inclusions

Quartz (Iron-stained or Ferruginous Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Druzy)

Crystalline Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz Drusy on Matrix

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Yellow quartz (likely lemon quartz/citrine)

Quartz, silicon dioxide (SiO₂); yellow coloration may be iron-related citrine or surface treatment

Likely weathered iron-rich rock fragment

Indeterminate; possibly limonite/goethite-bearing sandstone or ironstone

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

Uncertain dark metallic mineral specimen

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

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

Weathered serpentinite (likely)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, carbonate, and chromite

Quartz geode

Microcrystalline and crystalline quartz, SiO₂, likely with chalcedony and iron-oxide staining

Polished labradorite fragment

Labradorite, a calcium-rich plagioclase feldspar; approximate formula (Ca,Na)(Al,Si)₄O₈

Likely chrysocolla-bearing rock

Chrysocolla, a hydrated copper silicate; the specimen may also contain quartz or other copper minerals

Quartz–iron-oxide breccia or weathered quartz-bearing rock

Quartz (SiO₂) with limonite/goethite and possibly iron sulfides in a brecciated host

Dyed Agate (Tumbled)

Silicon Dioxide (Chalcedony variety, artificially dyed)

Blue labradorite (likely)

Labradorite, a calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

Weathered quartz-rich rock or fossil fragment

Indeterminate; likely quartz-bearing sandstone or siliceous fossil material

Ferruginous Quartz

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Druzy Quartz

Silicon Dioxide (SiO2)

Red Quartz

Silicon Dioxide (SiO2) with Hematite inclusions