Not A Rock (Man Made Industrial Metal)

Granite

Felsic intrusive igneous rock

Ferruginous Sandstone (Gozzan)

Iron-rich clastic sedimentary rock with Limonite/Goethite

Opal stud earrings

Opal, hydrated amorphous silica (SiO₂·nH₂O)

Granite

Felsic intrusive igneous rock

Diamond

Carbon (C)

Carved Mottled Greenish-Yellow Crystal/Glass Object

Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.

Likely iron meteorite or meteorite fragment

Unclassified meteoritic iron–nickel alloy, possibly an iron meteorite

Ruby ring (likely synthetic ruby)

Corundum, Al₂O₃; red color from chromium. The image alone cannot establish whether the stone is natural or lab-grown.

Quartz Sand

Silicon Dioxide (SiO2)

Copper-bearing oxidized rock

Likely malachite–chrysocolla with limonite/goethite in a weathered host rock; exact identification requires testing

Metallic iron meteorite fragment (probable)

Iron meteorite, mainly kamacite (α-Fe–Ni), possibly with taenite

Diamond

Diamond (C)

Silver (Sterling Silver)

Argentum (Ag) mixed with Copper (Cu); Formula: Ag+Cu

Polished red jasper pendant

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Diamond

Carbon (C)

Diamond (Cut Gemstone)

Carbon (C)

Granite

Phaneritic Felsic Igneous Rock

Granite

Phaneritic Felsic Intrusive Igneous Rock

Gold Nugget

Gold (Au)

Quartzite

Quartzite (SiO2)

Red faceted gemstone, likely synthetic ruby or red glass imitation

Possibly synthetic corundum (Al₂O₃:Cr³⁺); image alone cannot distinguish it from glass or another imitation

Quartz-rich pegmatite with green epidote or chlorite

Pegmatitic quartz–feldspar rock, likely containing epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH)) and/or chlorite

Granite

Intrusive igneous rock composed mainly of quartz, alkali feldspar, and plagioclase

Granite

Phaneritic Felsic Igneous Rock

Metallic meteorite fragment (probable stony-iron or iron meteorite)

Undetermined meteoritic Fe–Ni alloy with silicate minerals

Diamond in Kimberlite

Diamond (C in Kimberlite Matrix)

Banded Flint (Polished Stripe Flint)

Silicon Dioxide (SiO2) - variety of Chert

Quartz–calcite sulfide-bearing mineral specimen

Quartz (SiO₂) with likely calcite (CaCO₃) and iron sulfides, possibly pyrite (FeS₂); exact species requires testing

Hematite Beads

Hematite (Fe2O3)

Amber cabochon pendant

Amber (fossilized tree resin; chiefly polymerized terpenoids)

Iron meteorite (probable)

Fe–Ni metal, commonly kamacite and taenite

Bismuth

Bismuth (Bi)

Slag (Industrial Glass)

Anthropogenic Vitreous Slag (Post-industrial byproduct)

Gold

Native Gold (Au)

Sandstone

Arenite (SiO2, often with CaCO3 or Fe2O3 cement)

Granite

Felsic intrusive igneous rock

Biotite-bearing metamorphic rock, likely gneiss or schist

Mica-rich quartz–feldspar gneiss/schist; exact identification requires testing

Blue goldstone

Man-made aventurine glass containing metallic copper particles; not a natural mineral

Likely polished quartz or glass-like mineral cabochon

Probably quartz (SiO₂), though the image cannot exclude man-made glass

Beaded blue-and-green gemstone jewelry

Likely dyed or treated chalcedony/agate and green aventurine or glass-like stone; exact identification requires testing

Diamond (in a jewelry setting)

Carbon (C)

Possible iron-rich meteorite fragment

Undetermined; possible stony-iron or iron-oxide-rich meteorite