Sedimentary (Processed Mineral Product)

Bauxite (Aluminum Ore)

Hydrated aluminum oxides, primarily Al(OH)3, AlO(OH)

Quartz-rich rock fragment (tentative)

Quartz, silicon dioxide (SiO₂), possibly in a weathered host rock

Tumbled pink feldspar (likely moonstone or orthoclase)

Potassium feldspar, chiefly orthoclase (KAlSi₃O₈); possibly adularescent moonstone

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Likely polished agate or jasper

Microcrystalline quartz (SiO₂); exact variety cannot be determined from this photograph

Opalite

Synthetic glass / Opalized glass

Tumbled hematite

Hematite (α-Fe₂O₃)

Green aventurine bead bracelet

Quartz (SiO₂), commonly green quartzite/aventurine colored by fuchsite mica or other inclusions

Tiger’s eye beads

Tiger’s eye (quartz variety), SiO₂, with pseudomorphic fibrous crocidolite/goethite inclusions

Tumbled Tiger’s Eye

Quartz variety, fibrous SiO₂ with crocidolite pseudomorphs

Lepidolite

Lepidolite (K(Li,Al)3(Si,Al)4O10(F,OH)2)

Polished black obsidian

Volcanic glass; predominantly rhyolitic silica (SiO₂), with minor iron, magnesium, and alkalis

Magnetite Sand (Black Sand)

Magnetite (Fe3O4)

Schorl (Black Tourmaline)

Sodium Iron Aluminum Borosilicate Hydroxide - NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH

Kambaba Jasper

Stromatolite Jasper (Microcrystalline Quartz with Fossilized Cyanobacteria)

Kyanite-rich schist (probable)

Kyanite-bearing quartz–mica schist; kyanite, Al₂SiO₅

Asphalt

Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)

Sea Glass

Man-made silicate glass

Quartz Pebble

Silicon Dioxide (SiO2)

Limonite/Goethite Gossan

FeO(OH)·nH2O (Hydrated iron oxide)

Flint or chert, possibly a knapped stone tool

Microcrystalline quartz (SiO₂), commonly chalcedony with possible carbonaceous impurities

Weathered iron-rich geode or cavity fragment

Limonite/goethite-rich material, likely coating a weathered basaltic or volcanic host rock

Tumbled carnelian (likely)

Cryptocrystalline chalcedony, SiO₂; orange-red variety commonly called carnelian

River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)

Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Chrysocolla-bearing copper ore

Primarily chrysocolla, a hydrated copper silicate (approx. Cu₂−xAlx(H₂−xSi₂O₅)(OH)₄·nH₂O); exact identification is uncertain from the image.

Iron-rich concretion or weathered ironstone pebble

Goethite/limonite-bearing ironstone; commonly an iron-oxide concretion (FeO(OH)·nH₂O, variable)

Vintage-style bracelet with likely black onyx and yellow-and-white jasper or agate cabochon

Onyx (cryptocrystalline quartz, SiO₂); central stone appears to be patterned jasper or agate (chalcedony, SiO₂), though identification from the image is uncertain

Metallic sulfide mineral specimen, likely pyrite-bearing ore

Likely pyrite (FeS₂), possibly mixed with other sulfides or host rock

Muscovite mica schist

Muscovite-rich schist; chiefly muscovite mica with possible quartz and feldspar

Kyanite

Al2SiO5

Granite

Phaneritic Plutonic Felsic Rock

Slate

Slate (Foliated Metamorphic Rock)

Tumbled yellow-green chalcedony or serpentine

Microcrystalline quartz (SiO₂), possibly chrysoprase; alternative: serpentine-group mineral

Goethite

Goethite (FeO(OH))

Tumbled iron-rich concretion or ironstone pebble

Goethite–hematite-rich ironstone; commonly limonite (FeO(OH)·nH₂O) with hematite (Fe₂O₃)

Orange calcite

Calcite, calcium carbonate (CaCO₃)

Black Kyanite

Kyanite (Al2SiO5) with carbonaceous inclusions

Kyanite

Al2SiO5

Gold (10K Alloy)

Aurum (Au) with alloying metals (Cu, Ag, Zn)

Tumbled pale-yellow chalcedony (possibly yellow jasper)

Microcrystalline quartz, SiO₂; chalcedony/jasper varieties