Mineral (Silicate Variety)

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

Ferrosilicon Slag (Industrial Vitrified Glass)

Vitreous Silicate Residue

Kaolinite (China Clay)

Kaolinite (Al2Si2O5(OH)4)

Red Sandstone

Arenite (Ferruginous Sandstone)

Garnet crystals

Garnet-group silicates, likely almandine (Fe₃Al₂Si₃O₁₂)

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

Mixed mineral and rock specimen collection

Assorted silicates, carbonates, oxides, and sulfides; individual species cannot be reliably identified from this image

Mixed tumbled gemstone and mineral lot

Primarily quartz varieties (SiO₂), feldspar, beryl/chalcedony, and other unidentified silicate minerals

Epidosite with Quartz (Unakite-variant or Jasper)

Epidotized Metasomatite

Slag Glass (Leland Blue variant)

Anthropogenic Vitreous Silicate

Black Kyanite

Aluminum Silicate (Al2SiO5)

Ocean Jasper

Orbicular Jasper / Silicate

Zircon

Zirconium Silicate (ZrSiO₄)

Smelter Slag

Anthropogenic Silicate Slag

Light-colored limestone (probable fossiliferous or micritic limestone)

Calcite-rich carbonate rock; predominantly CaCO₃ (calcite)

Biotite (Mica)

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

Slag Glass

Vitreous Silicate Residue

Raw Garnet Fragment

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

Granite Pebble (Pink Feldspar-rich)

Granite

Copper Ore / Altered Granodiorite

Cupriferous rock with silicate gangue

Quartz (Iron-Stained or Milky Quartz)

Silicon Dioxide (SiO2)

Unidentified Dark Mineral or Rock

Indeterminate (Likely Silicon Dioxide or Carbon-based)

Garnet (Almandine-Pyrope)

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

Serpentinite

Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)

Weathered basaltic rock (probable basalt)

Basalt; fine-grained mafic silicate rock, commonly plagioclase + pyroxene ± olivine

Unidentified brown mineral/rock fragment

Indeterminate from image; possibly iron-stained quartz, feldspar, or weathered limonite

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Green-speckled igneous rock, likely epidote-bearing basalt or serpentinite

Tentatively epidote-bearing basalt (compositionally uncertain from the image)

Blue Topaz

Aluminum Silicate Fluoride Hydroxide (Al2SiO4(F,OH)2)

Unidentified rough mineral fragments

Likely quartz- or feldspar-bearing rock; exact identification requires testing

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Jasper

Jasper (Silicon Dioxide, SiO2)

K-Feldspar (Potassium Feldspar / Pink Feldspar)

KAlSi3O8 (Potassium Aluminum Silicate)

Tumbled serpentine (likely bowenite)

Serpentine-group magnesium silicate; commonly antigorite, lizardite, or chrysotile (Mg₃Si₂O₅(OH)₄)

Tree Agate

Silicon Dioxide (SiO2) with Chlorite inclusions

Prase or Green Quartz

Silicon Dioxide (SiO2 with actinolite or chlorite inclusions)

Blue Zircon

Zircon (Zirconium Silicate - ZrSiO4)

Unknown dark mineral fragment

Indeterminate; possibly a dark silicate mineral or slag-like geological fragment

Chert (specifically Green Chert/Jasper)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Blue Zircon

Zircon (Zirconium Silicate), ZrSiO4

Druzy quartz-bearing rock

Quartz, SiO₂, as a druse coating or quartz-rich vein material

Glauconitic Sandstone

Glauconitic Sandstone (Greensand)