Mineral (Specifically, A Variety Of The Mineral Species Pyrope Almandine Garnet)

Gneiss

Gneiss

Tumbled Mixed Gemstones and Rocks

Various mineral species including quartz (SiO2) and silicate minerals

Serpentinite

Serpentinite (composed primarily of serpentine group minerals including antigorite, chrysotile, and lizardite)

K2 stone (azurite–granite)

Biotite granite hosting blue azurite (Cu₃(CO₃)₂(OH)₂), often with malachite and quartz

Schist

Mica Schist

Schist

Mica Schist

Mica Schist

Mica Schist (primarily Muscovite and/or Biotite Schist)

Weathered iron-rich rock, possibly garnet schist or mica schist

Foliated metamorphic rock; likely mica schist with iron oxides and quartz, but exact identification is uncertain from the image

Pink feldspar-bearing granite or pegmatitic rock

Granite/pegmatite, chiefly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), plagioclase, and dark mica/amphibole; pink areas may be K-feldspar or garnet.

Likely dark rounded pebbles

Indeterminate; possibly basalt or a dark mafic mineral such as hornblende/biotite

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Fossilized Shark Tooth

Chondrichthyes (Class)

Diamond (in a jewelry setting)

Diamond (Carbon, C)

Milky Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Feldspar (specifically Orthoclase)

Potassium aluminum silicate (KAlSi3O8)

Iron-stained quartz-rich rock, possibly goethite-bearing quartz

Quartz (SiO₂) with iron oxides/hydroxides, likely goethite or limonite

Bauxite

Aluminum ore (mixture of gibbsite Al(OH)3, boehmite γ-AlO(OH), and diaspore α-AlO(OH))

Banded Agate (specifically Botswana Agate appearance)

Silicon Dioxide (SiO2)

Sandstone (likely Greywacke or Siltstone variety)

Arenite / Siltstone (primarily SiO2)

Moonstone (Green Moonstone / Garnierite)

Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Garnierite

Chrysotile Asbestos

Mg3Si2O5(OH)4

Serpentinite

Serpentinite (composed primarily of Serpentine-group minerals: (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Honey Calcite

Calcite (Calcium Carbonate, CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Black tourmaline-bearing pegmatite or schorl-rich metamorphic rock

Schorl tourmaline, NaFe3Al6(BO3)3Si6O18(OH)4, with quartz/feldspar and iron-oxide matrix

Fuchsite

Chromium-rich Muscovite Mica

Schist

Mica Schist

Schist

Mica Schist (Medium-grade Metamorphic Rock)

Banded Agate (specifically Carnelian Agate slice)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Turquoise (Rough Specimens)

Hydrous phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O

Schist

Mica Schist

Agate (specifically a small Chalcedony nodule)

Agate (Cryptocrystalline variety of Quartz, SiO2)

Banded Agate (specifically Sardonyx or Carnelian Agate)

Silicon Dioxide (SiO2) - Chalcedony variety

Agate (specifically Carnelian Agate or Sardagate)

Silicon dioxide (SiO2) - variety of chalcedony

Polished ocean jasper / orbicular jasper (probable)

Silica-rich chalcedony (microcrystalline quartz, SiO₂) with iron oxides and altered volcanic inclusions

Weathered iron-rich rock (probable limonite/goethite)

Limonite: hydrated iron oxides, chiefly goethite (FeO(OH)) and hematite (Fe₂O₃)

Granitic Gneiss

Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)

Banded Agate (specifically Sardonyx Agate)

Silicon Dioxide (SiO2) - Chalcedony variety

Banded Agate (specifically Botswana Agate or Water-line Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Banded Agate (specifically Botswana Agate appearance)

Silicon Dioxide (SiO2) - variety of Chalcedony

Banded Agate (specifically Carnelian Agate)

Silicon Dioxide (SiO2) - Chalcedony variety