Uncertain

Banded metamorphic rock, likely gneiss or amphibolite

Composition uncertain; probable quartz–feldspar–amphibole assemblage

Beige polished stone tile (likely limestone or marble)

Uncertain; probable calcite-rich limestone or marble (CaCO₃)

Dyed red crystal aggregate, likely quartz or salt

Uncertain; possibly dyed quartz (SiO₂) or halite (NaCl)

Honey-colored quartz-rich stone, possibly chert or chalcedony

Microcrystalline silica (SiO₂), identification uncertain from photograph

Dark mafic rock, possibly basalt with weathered iron staining

Likely basalt; exact identification is uncertain from the photograph

Small metallic mineral fragment, possibly galena or slag-like sulfide

Tentatively galena (PbS), but identification is uncertain from the image

Small rounded pebble, likely quartz-rich sandstone or granitoid fragment

Uncertain; probable quartz/feldspar-bearing lithic pebble

Polished yellow chalcedony (likely citrine-like quartz or honey agate)

Microcrystalline quartz, SiO₂ (chalcedony; exact variety uncertain)

Likely weathered feldspar-rich rock fragment

Uncertain; possibly orthoclase or microcline feldspar in a pegmatitic rock

Possible chert or weathered quartzite fragment

Microcrystalline quartz (SiO₂), identification uncertain from the photograph

Rounded gray pebble, likely basalt or fine-grained volcanic rock

Probable basalt; exact identification is uncertain from the photograph

Weathered quartz-rich pebble, possibly milky quartz or chalcedony

Quartz, SiO₂; exact variety uncertain from the image

Blue quartzite or blue aventurine glass-like aggregate

Quartzite, predominantly SiO₂ (identification uncertain from image)

Weathered quartz-rich cobble, possibly quartzite or feldspar-rich granite

Quartz–feldspar aggregate; identification is uncertain from the photograph

Likely lateritic ironstone (limonite/goethite-rich)

Goethite, α-FeO(OH), with possible limonite and clay impurities

Weathered iron-rich rock, likely hematite-bearing sandstone or ironstone

Hematite/goethite-bearing ferruginous sandstone or ironstone; exact identification requires testing

Tumbled black stone, likely black obsidian

Obsidian — natural volcanic glass, primarily SiO₂

Tumbled green aventurine (probable)

Aventurine quartz, SiO₂ with fuchsite mica inclusions

Quartz–pyrite druzy slab

Quartz (SiO₂) with pyrite (FeS₂), likely in a geode or hydrothermal vein

Likely serpentinite or serpentinized ultramafic rock

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and relict olivine/pyroxene

Likely basalt (possibly vesicular basalt)

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine, with iron-titanium oxides

Polished jasper pebble

Microcrystalline quartz (SiO₂), commonly iron-stained jasper/chert

Polished yellow-green serpentine pendant

Serpentine-group minerals, chiefly antigorite and/or lizardite; approximate formula Mg3Si2O5(OH)4

Polished ocean jasper (orbicular jasper), probable

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide and other mineral inclusions

Red cabochon gemstone, likely carnelian

Carnelian: orange-red chalcedony, microcrystalline quartz (SiO₂)

Tumbled translucent quartz or chalcedony fragment

Silicon dioxide, SiO₂; likely quartz/chalcedony

Raw mica-bearing metamorphic rock, likely schist

Mica schist; chiefly muscovite/biotite mica with quartz and feldspar

Inlaid stone ring (likely jasper or agate)

Likely microcrystalline quartz (chalcedony, SiO₂), possibly jasper, with decorative mineral inlays

Likely raw blue kyanite specimens

Kyanite, Al₂SiO₅

Tumbled serpentine (likely)

Serpentine-group minerals, commonly lizardite or antigorite; approximate composition Mg₃Si₂O₅(OH)₄

Biotite-rich schist (mica schist)

Mica schist, chiefly quartz + biotite mica; approximate formula for biotite K(Mg,Fe)3AlSi3O10(F,OH)2

Gold-bearing sulfide ore, likely gossan or quartz-vein material

Native gold (Au) with probable iron oxides/hydroxides and sulfides, possibly quartz matrix

Turquoise cabochon or turquoise-bearing material

Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O

Pyrite-bearing sulfide ore

Pyrite (FeS₂), possibly mixed with chalcopyrite and/or other sulfides

Fossiliferous limestone, likely coralline or stromatolitic

Biogenic limestone; predominantly calcite (CaCO₃)

Polished turquoise (likely stabilized)

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Native gold-bearing quartz/rock specimen

Native gold (Au) in quartz and iron-oxide matrix

Biotite gneiss (probable)

Foliated gneiss composed mainly of quartz, feldspar, and biotite mica

Rose quartz (likely)

Quartz, silicon dioxide (SiO₂), pink variety

Likely quartz-rich granitic rock

Granite or granitic pegmatite; mainly quartz (SiO₂) with feldspar and minor mica

Serpentinite (likely serpentinized ultramafic rock)

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), with possible magnetite, olivine, pyroxene, and talc

Raw purple fluorite crystal (tentative)

Fluorite, calcium fluoride (CaF₂)