Mineral (Silicate Variety)

Serpentinite

Serpentinite (complex silicate minerals including Mg3Si2O5(OH)4)

River Jasper (Green Jasper)

Silicon Dioxide (SiO2) with impurities

Vesuvianite (Idocrase)

Ca19(Al, Mg, Fe)13(SiO4)10(Si2O7)4(OH, F, O)10

Nephrite Jade / Epidote Pebble

Ca2(Mg,Fe)5Si8O22(OH)2 / Ca2Al2Fe3+(SiO4)(Si2O7)O(OH)

Mixed Tumbled Stones Collection

Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)

Garnet (Almandine/Pyrope variety)

Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.

Limonite Geode / Ironstone Nodule

Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)

Likely polished garnet

Garnet group; probably almandine, iron-aluminum silicate (Fe₃Al₂Si₃O₁₂)

Garnet

Garnet Group (Silicate Minerals)

Glauconitic Sandstone (or Greenstone)

Glauconitic Sandstone with Quartz

Glauconitic Sandstone

Glauconitic Quartz Arenite

Olivine in Basalt matrix

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Picture Jasper

Silicon Dioxide (SiO2) with impurities

Tumbled serpentine

Serpentinite; chiefly antigorite, lizardite, and chrysotile, with possible magnetite and accessory minerals

Blue Topaz

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Black Tourmaline (Schorl)

Sodium Iron Aluminum Borate Silicate (NaFe3Al6(BO3)3Si6O18(OH)4)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Tourmalinated Quartz or Schorl

Silicate mineral, specifically Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4) or dark Tourmaline crystal cluster

Kaolinite (China Clay / Chalky Claystone)

Al2Si2O5(OH)4

Quartz Pebble

Silicon Dioxide (SiO2)

Jasper (Red/Yellow)

Silicon Dioxide (SiO2) with impurities

Basalt

Mafic volcanic rock (various silicate minerals including Pyroxene and Plagioclase)

Garnet-bearing granite or pegmatitic granitic rock

Coarse-grained granitoid, likely granite or pegmatite, composed mainly of quartz and feldspar with almandine/spessartine garnet and dark biotite or amphibole

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and dark mineral inclusions

Glauconitic Sandstone

Greensand (Glauconite-bearing sandstone)

Labradorite

(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)

Epidosite with Quartz (Unakite-variant or Jasper)

Epidotized Metasomatite

Jasper

Silicon Dioxide (SiO2) with iron and magnesium inclusions

Kaolinite (Kaolin)

Kaolinite (Al2Si2O5(OH)4)

Blue Aventurine

Silicon Dioxide (SiO2) with inclusions of Dumortierite

Green Jasper (with Quartz veining)

Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2

Slag (Industrial Byproduct)

Anthropogenic Vitreous Silicate material

Light-colored limestone (probable fossiliferous or micritic limestone)

Calcite-rich carbonate rock; predominantly CaCO₃ (calcite)

Biotite (Mica)

K(Mg,Fe)3AlSi3O10(OH,F)2

Raw Garnet Fragment

Nesosilicate Group (e.g., Almandine, Fe3Al2(SiO4)3)

Granite Pebble (Pink Feldspar-rich)

Granite

Brecciated jasper, possibly rainforest jasper or brecciated rhyolite

Brecciated microcrystalline quartz (SiO₂), commonly called jasper; the green portions may contain epidote, chlorite, or iron-bearing silicates, while red-brown areas are typically hematite or other iron oxides

Kaolinite (China Clay)

Kaolinite (Al2Si2O5(OH)4)

Red Sandstone

Arenite (Ferruginous Sandstone)

Garnet (Almandine-Pyrope)

Almandine-Pyrope Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3