Unknown

Iron-stained sandstone

Quartz-rich sandstone with iron-oxide staining (quartz, SiO₂; hematite/goethite, Fe₂O₃/FeO(OH))

Iron-oxide-stained sandstone (likely ferruginous sandstone)

Quartz-rich sandstone cemented or stained by iron oxides, chiefly hematite (Fe₂O₃) and possibly goethite (FeO(OH))

Honey-colored calcite on dark matrix

Calcite (CaCO₃), likely with an unidentified host-rock matrix

Pink halite (rock salt)

Halite (NaCl), likely colored by trace impurities

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)

Weathered, coarse-grained rock (possibly granite)

Granite, tentatively identified; exact rock type cannot be determined from the image

Small dark, polished stone—possibly hematite or magnetite

Indeterminate from the photograph; candidates include hematite (Fe₂O₃) and magnetite (Fe₃O₄)

Red coral beads (possibly dyed or imitation coral)

Corallium spp. skeleton, composed mainly of calcium carbonate (calcite); exact material cannot be confirmed from the image

Red feldspar-rich rock, possibly potassium feldspar

Likely orthoclase or microcline (KAlSi₃O₈), though the image is insufficient for a definitive identification

Drill-core rock, likely foliated metamorphic rock

Indeterminate from the photograph; possibly slate, phyllite, or schist

Weathered, foliated metamorphic rock (likely schist or phyllite)

Probably mica-rich schist or phyllite; exact identification requires close examination of its grains and foliation

Stromatolite (stromatolitic limestone)

Laminated microbial carbonate, chiefly calcite (CaCO₃); precise species or age cannot be determined from the photo

Green-tumbled stone, possibly epidote-bearing rock

Undetermined green silicate; possible epidote (Ca₂Al₂Fe³⁺(SiO₄)(Si₂O₇)O(OH)) in a rock matrix

Likely rhyolite or altered volcanic rock

Fine-grained felsic volcanic rock, probably rhyolite; exact identification is uncertain from the image

Blue-green fluorite (rough crystal)

Fluorite, calcium fluoride (CaF₂)

Rounded river stone (likely iron-stained sandstone or siltstone)

Indeterminate ferruginous sandstone/siltstone; composition cannot be confirmed from the image

Rounded river cobble, likely weathered volcanic or metamorphic rock

Indeterminate from photograph; possible basaltic-andesite, rhyolite, or quartz-rich metamorphic lithology

Likely copper-bearing rock (oxidized copper ore)

Unidentified copper minerals, possibly malachite and cuprite; the image is insufficient for a precise identification

Faceted clear gemstone in a gold-tone ring, likely colorless glass or cubic zirconia

Undetermined; possible cubic zirconia (ZrO₂) or glass (amorphous SiO₂)

Rose quartz-bearing pegmatite

Quartz (SiO₂) with pink feldspar, likely potassium feldspar; exact identification is limited by the image

Honey-colored calcite

Calcite (CaCO₃)

Iron-stained sandstone

Quartz-rich sandstone, chiefly SiO₂, cemented by iron oxides

Banded sandstone

Quartz-rich sandstone, likely with iron-oxide staining

Likely pyrite-bearing rock fragment

Pyrite (FeS₂), possibly in a weathered host rock; identification is uncertain from the image

Polished agate geode slice

Agate, a banded variety of microcrystalline quartz (SiO₂); likely quartz/chalcedony lining a geode

Fine-grained sandstone (tentative)

Quartz-rich sandstone; exact composition cannot be confirmed from the photograph

Likely iron-stained quartz or quartz-rich rock fragment

Quartz (SiO₂), possibly colored by iron oxides such as goethite or hematite

Greenstone / serpentinized rock

Serpentinite, commonly dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)

Halite (Rock Salt)

Sodium Chloride (NaCl)

Small dark rock fragment (not identifiable from the image)

Undetermined; no diagnostic mineral features are visible

Small rounded quartz-rich pebble

Likely quartz (SiO₂), possibly iron-stained or mixed with other minerals

Pink halite (rock salt)

Halite, NaCl

Mica-rich schist

Mica schist, composed chiefly of muscovite and/or biotite mica with quartz and possibly feldspar

Likely quartzite

Quartzite, composed predominantly of quartz (SiO₂)

Iron-stained quartz-rich rock, possibly quartz vein material

Quartz (SiO₂) with iron-oxide staining; host rock not identifiable from the image

Small metallic-looking rock fragment

Uncertain; possibly galena-bearing ore or mica-rich schist

Rock salt (Halite)

Halite (Sodium Chloride, NaCl)

Pink Halite (Himalayan Salt)

Halite (Sodium Chloride, NaCl)

Pink Himalayan Salt (Halite)

Halite - NaCl (Sodium Chloride) with trace Iron Oxide and Magnesium

Himalayan Pink Salt

Halite (NaCl) with trace minerals (Iron, Magnesium, Potassium)

Brick veneer, likely manufactured from clay-rich shale

Fired clay brick; chiefly aluminosilicate minerals, commonly mullite and glassy silicate phases after firing

Iron-stained quartz-rich rock

Quartz-rich vein rock, possibly iron-oxide-stained quartzite or brecciated quartz