Antropogenic (Man Made Industrial Byproduct)

Land Snail Shell

Gastropoda (Calcium Carbonate, CaCO3)

Sandstone

Arenite

Pale green aventurine (likely quartz) sphere

Quartz, SiO₂; possibly pale green aventurine, with color from inclusions or treatment

Quartzite

Metamorphic Quartz Sandstone

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Green glassy slag or manufactured glass bead

Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral

Bicolor Quartz (Milk Quartz with Slag or Dark Inclusions)

Silicon Dioxide (SiO2) with impurities

Sandstone (Pebble)

Sandstone (arenite, arkose, wacke depending on composition)

Jasper

Silicon dioxide (SiO2) with impurities

Likely quartz fragment

Quartz (silicon dioxide, SiO₂)

Iron meteorite (likely weathered octahedrite)

Fe–Ni kamacite–taenite alloy, possibly a Canyon Diablo-type specimen

Possible iron meteorite fragment

Iron–nickel meteorite, likely kamacite–taenite alloy

Iron Meteorite / Limonite-coated Meteorite / Iron Nodule

Iron-Nickel Alloy (Kamacite and Taenite) with weathering crust

Quartzite

Metamorphic Rock (Mainly SiO2)

Obsidian (Black)

Obsidian (High-silica volcanic glass)

Diabase (Greenstone)

Diabase (Dolerite)

Likely flint pebble (possibly a worked flint fragment)

Microcrystalline quartz (chalcedony), SiO₂; commonly called flint

Cupronickel (on a 1981 Mexico 20 Pesos coin)

Copper-Nickel Alloy (Cu75Ni25)

Diamond (Pear Cut)

Carbon (C)

Sandstone

Arenite

Jade bangle

Likely nephrite jade (actinolite–tremolite amphibole); possibly jadeite

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

Turquoise cabochon ring

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

Small polished gemstone chips, likely mixed quartz varieties

Quartz (SiO₂), possibly including smoky quartz and other varieties; exact identification is uncertain from the image

Weathered stone nodule or concretion

Unidentified lithic concretion; composition cannot be determined from the image

Red Sandstone

Arenite (with Iron Oxide / Hematite staining)

Iron-rich meteorite candidate

Unclassified iron meteorite or stony-iron meteorite; confirmation requires chemical and nickel testing

Limestone

Calcareous sedimentary rock (CaCO3)

Ferruginous Sandstone (Ironstone)

Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Weathered iron-rich rock, possibly jasper or ironstone

Likely limonite/goethite-bearing siliceous rock; exact identification requires hardness and streak tests

Milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz geode

Quartz (SiO₂), likely a chalcedony-lined geode with druzy quartz

Dyed Blue Agate Slice

Silicon Dioxide (SiO2)

Blue glassy mineral fragment, possibly kyanite or blue quartz

Indeterminate from image; candidates include kyanite (Al₂SiO₅) or blue quartz (SiO₂)

Chert (Yellow Jasper variant)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Small dark pebble, possibly basalt or slag

Likely fine-grained mafic rock; exact identification requires examination

Banded Calcite or Travertine

Calcium Carbonate (CaCO3)

Opal ring (likely precious opal)

Hydrated amorphous silica, SiO₂·nH₂O; the pictured stone may be natural opal or a lab-created/imitation opal

Chert (specifically Flint Arrowhead)

Silicon dioxide (SiO2) - Microcrystalline Quartz