Meteorite

Dark mafic rock, possibly basalt or meteorite-like specimen

Likely basalt (plagioclase–pyroxene assemblage); meteorite identification cannot be confirmed visually

Basalt with Fusion Crust (Meteorite-like appearance)

Vesicular Basalt

Small dark mineral/rock fragment

Indeterminate; possibly biotite-rich schist, graphite, or metallic sulfide

Peridot

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

Possible basalt or iron-rich slag-like geological specimen

Basalt (tentative); predominantly plagioclase and pyroxene, possibly with magnetite/iron oxides

Peridot

Olivine ((Mg, Fe)2SiO4)

Weathered iron-rich rock (likely basalt or ironstone)

Probable altered basalt; exact identification requires testing

Silicon (Industrial Grade)

Elemental Silicon (Si)

Iron-rich hematite/goethite rock (ironstone)

Hematite (Fe₂O₃) with goethite/limonite (FeO(OH)·nH₂O), likely in a weathered ironstone matrix

Magnetite (lodestone), possibly meteoritic iron

Magnetite, Fe₃O₄; exact identification is uncertain from the image alone

Tektite (Indochinite)

Tektite (High-silica natural glass)

Libyan Desert Glass

Libyan Desert Glass (SiO2 with trace elements)

Possible tektite or volcanic glass specimen

Natural silica glass; composition commonly near SiO₂, but exact identification requires chemical testing

Libyan Desert Glass

Libyan Desert Glass (Impactite / High-silica Lechatelierite)

Olivine (Dunite)

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

Breccia (likely volcanic or impact breccia)

Polymictic breccia; clasts in a fine-grained silicate matrix, exact mineralogy indeterminate from image

Tektite (specifically Indochinite)

Tektite (Natural silica glass)

Tektite (Indochinite)

Tektite (Amorphous Silica Glass)

Weathered iron-rich rock fragments

Likely limonite/goethite-stained basalt or ironstone; exact identification requires testing

Likely basalt pebble

Basalt, a fine-grained mafic volcanic rock; commonly composed of plagioclase, pyroxene, and sometimes olivine

Possibly polished basalt or gabbro

Basalt/gabbro; chiefly plagioclase feldspar and pyroxene, with possible olivine or magnetite

Iron-rich concretion or weathered ironstone nodule

Goethite–hematite-rich limonite concretion (tentative)

Porphyritic basalt (likely olivine- or pyroxene-bearing basalt)

Basalt; fine-grained mafic volcanic rock, commonly containing clinopyroxene and/or olivine phenocrysts

Weathered iron-rich mineral concretion

Likely limonite/goethite concretion (hydrated iron oxides), possibly a weathered ironstone fragment

Gold Nugget

Native Gold (Au)

Ferruginous Sandstone (Ironstone)

Sedimentary rock with high iron oxide content (Fe2O3 / FeO(OH))

Likely weathered iron-rich stone or concretion

Indeterminate; possibly ferruginous sandstone, ironstone, or a weathered sedimentary concretion

Weathered dark mineral/rock fragment

Indeterminate; possibly iron-rich basalt, slag, or a sulfide-bearing mineral

Weathered iron-rich rock fragment

Likely limonite/goethite with hematite and iron-bearing silicates; exact identification requires testing

Dark rounded pebble, possibly basalt

Basalt (fine-grained mafic volcanic rock; identification tentative from photograph)

Dark gray metamorphic rock fragment, likely slate or schist

Fine-grained foliated silicate rock; composition likely quartz, feldspar, mica, and/or chlorite

Rounded ironstone or weathered basalt pebble

Likely basaltic rock, possibly iron-rich concretion; exact identification requires testing

Iron-rich slag or limonite-bearing rock

Hydrated iron oxides, chiefly limonite/goethite (FeO(OH)·nH₂O); possibly industrial iron slag

Bronzite

(Mg,Fe)SiO3

Hypersthene

Enstatite-Ferrosilite series, (Mg,Fe)2Si2O6

Peridot

Olivine ((Mg, Fe)2SiO4)

Peridot

Olivine ((Mg,Fe)2SiO4)

Possible tektite or dark volcanic rock fragment

Uncertain; likely natural silicate glass (tektite) or basalt

Tektite (Indochinite)

Tektite (Amorphous silica-rich impact glass)

Weathered metallic-looking rock, possibly hematite-bearing ironstone

Hematite-rich ironstone; hematite Fe₂O₃, potentially with magnetite Fe₃O₄ and quartz

Native Gold (in the form of jewelry)

Gold (Au)

Peridot (Olivine)

Olivine ((Mg, Fe)2SiO4)