All rocks & minerals

Polished green aventurine (likely)

Quartz aggregate, SiO₂, with green fuchsite mica inclusions

Tumbled brown aventurine (likely quartzite)

Quartz-rich quartzite, predominantly SiO₂; exact identification cannot be confirmed from the image alone

Mookaite jasper

Mookaite (mookite), an iron-rich, silicified radiolarian sediment; chiefly microcrystalline quartz and chalcedony (SiO₂) with iron oxides

Likely chlorite schist

Chlorite-rich schist; commonly composed of chlorite, quartz, and mica

Polished rainbow moonstone

Moonstone, typically orthoclase feldspar (KAlSi₃O₈), often with albite intergrowths; the pictured material may be sold as gray moonstone or labradorite depending on composition.

Weathered limestone fragment

Limestone, composed predominantly of calcite (CaCO₃)

Quartz-rich pegmatite

Granitic pegmatite, composed mainly of quartz and feldspar with dark mica or other accessory minerals

Calcite crystal cluster

Calcite, calcium carbonate (CaCO₃)

Iron-stained chert (likely)

Microcrystalline quartz (SiO₂), with iron-oxide staining

Fossil shell in limestone

Likely a fossilized bivalve or gastropod preserved in calcitic limestone; exact identification is not possible from the image.

White milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Botryoidal calcite specimen

Calcite, CaCO₃, with possible dolomite or other carbonate matrix

Milky quartz vein in host rock

Quartz, SiO₂, likely with iron-oxide staining; host rock is not identifiable from the image

Iron-stained quartz with druzy crystals

Quartz, silicon dioxide (SiO₂), with iron-oxide staining

Golden druzy quartz geode

Quartz, SiO₂, lining a geode cavity; likely iron-oxide stained

Quartz geode fragment

Quartz (SiO₂), lining a cavity in a silica-rich rock

Fossil shell fragment

Fossilized mollusk shell; exact taxon and composition cannot be determined from the image

Botryoidal chalcedony (possibly druzy quartz)

Microcrystalline quartz, SiO₂; surface may include small quartz crystals

Possible dark garnet or other rough mineral fragment

Undetermined; the image does not show enough diagnostic detail to identify a species

Large rounded metamorphic boulder, likely gneiss or granitic gneiss

Gneiss (likely quartz–feldspar–mica gneiss; exact identification requires closer examination)

Polished raw copper-bearing rock, likely cuprite–malachite ore

Copper oxides and carbonates, likely cuprite (Cu₂O) with malachite (Cu₂CO₃(OH)₂); exact identification requires testing

Large rounded boulder, likely foliated metamorphic rock (possibly gneiss or schist)

Undetermined foliated silicate rock; mineral species cannot be confirmed from the photograph

Milky quartz

Quartz, silicon dioxide (SiO₂)

Diamond (or White Topaz / Quartz in Gold Setting)

Carbon (C) [if Diamond] or SiO2 / Al2SiO4(F,OH)2

Diamond-set gold ring

Diamond (crystalline carbon, C) in a gold alloy setting

Diamond ring (center stone appears to be a diamond)

Diamond, crystalline carbon (C); the setting is gold-colored metal

Diamond (set in jewelry)

Diamond (C)

Diamond-set gold jewelry piece

Diamond, crystalline carbon (C), mounted in gold alloy

Gemstone ring (stone not identifiable)

Unknown; the small central stone may be a colorless gemstone or glass, and the surrounding metal is gold-colored alloy

Diamond ring (likely clear cut gemstone)

Diamond, crystalline carbon (C)

Petrified wood (possible)

Silicified wood; fossilized tree tissue, commonly replaced by microcrystalline quartz (SiO₂)

Diamond (mounted in an ornate ring)

Diamond, crystalline carbon (C)

Pink-red faceted gemstone ring (likely garnet)

Possibly pyrope–almandine garnet, (Mg,Fe)₃Al₂(SiO₄)₃; identification from the image is uncertain

Jade-and-cabochon fruit cocktail ring

Likely nephrite or jadeite (jade) leaves with orange/cream chalcedony or other cabochons; identification from the image is uncertain

Iron-stained quartz geode

Mostly microcrystalline and crystalline quartz (SiO₂), with iron-oxide staining; exact identification is uncertain from the photo

Granite (Black/Dark Granite countertop background)

Intrusive felsic/intermediate igneous rock (e.g., granodiorite or tonalite)

Weathered granite

Granite, a quartz–feldspar plutonic rock

Garnet-bearing quartz (likely almandine garnet in milky quartz)

Quartz (SiO₂) with garnet, likely almandine (Fe₃Al₂(SiO₄)₃)

Diamond (or Cut Gemstone Simulants)

Carbon (C)

Quartz-rich pegmatite with dark tourmaline

Quartz–feldspar pegmatite, likely with black schorl (tourmaline)

Green chalcedony (likely agate) earrings

Chalcedony, microcrystalline quartz (SiO₂)

Dark green schist (probable chlorite/actinolite schist)

Chlorite–actinolite schist; exact mineral identification requires testing