Meteorite (Extraterrestrial Material)

Olivine (Peridotite)

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

Limonite Concretion (Goonie or Rattlestone)

Limonite (FeO(OH)·nH2O)

Weathered iron-rich rock, possibly limonite-bearing quartzite or altered basalt

Indeterminate; likely quartz (SiO₂) with iron oxides/hydroxides such as limonite/goethite

Iron-rich slag or limonite-bearing rock

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

Olivine

(Mg,Fe)2SiO4

Iron Meteorite

Iron-Nickel Meteorite (primarily composed of kamacite and taenite alloys)

Fulgurite

Fulgurite (Lechatelierite / Vitreous Silica)

Unidentifiable embedded dark fragment

Indeterminate; possibly a dark silicate mineral or lithic inclusion

Chondrite Meteorite Fragment

Ordinary Chondrite (L or H type)

Dark, vesicular volcanic rock (probable basaltic scoria)

Basaltic scoria; mainly plagioclase, clinopyroxene, olivine, and volcanic glass

Possible metallic meteorite or iron-nickel bead

Unconfirmed; possible Fe–Ni alloy (kamacite/taenite)

Possible tektite or dark volcanic rock fragment

Uncertain; likely natural silicate glass (tektite) or basalt

Weathered quartz-rich rock fragment

Likely quartz-bearing sandstone or granitic rock; exact identification is uncertain from the image

Iron-stained weathered stone (tentative)

Undetermined; possibly weathered iron-rich basalt or concretion

Sandstone Concretion

Ferruginous Sandstone Concretion

Olivine/Peridot

Magnesium Iron Silicate (Mg,Fe)2SiO4

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Chondrite Meteorite

L3 Chondrite (Unequilibrated Ordinary Chondrite)

Slag (Industrial Glassy Byproduct)

Anthropogenic silicate byproduct (Slag)

Unidentified dark metallic sulfide specimen

Possibly pyrite-, chalcopyrite-, or galena-bearing ore; exact identification requires testing

Tektite (specifically Indochinite)

Tektite (Natural silica glass)

Unidentified dark mineral or rock specimen

Indeterminate from the severely blurred image; possible dark igneous rock or opaque mineral

Weathered iron-rich rock fragment

Indeterminate; likely basaltic or mafic rock with iron-oxide staining

Vesicular basalt (weathered lava rock)

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

Weathered iron-rich rock fragment

Indeterminate; likely limonite/goethite-bearing sandstone or laterite

Olivine (Peridotite / Dunite Pebble)

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

Possible iron-rich pebble or weathered basalt

Indeterminate; likely iron-stained mafic rock, possibly basalt

Tektite (Indochinite)

Tektite (SiO2 + Al2O3, Glassy Melts)

Olivine (in Peridotite/Dunite form)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Iron-oxide-bearing rock fragment

Likely limonite/goethite with quartz or host-rock inclusions; exact identification requires testing

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Slag

Anthropogenic Vitrification Product / Silicate Slag

Weathered iron-rich rock fragments

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

Weathered quartz-rich pebble

Likely quartz-bearing granitoid or quartz vein fragment; exact identification requires testing

Ironstone concretion

Siderite or Limonite concretion (FeCO3 or FeO(OH)·nH2O)

Olivine (Peridot)

(Mg,Fe)2SiO4

Olivine (Peridotite)

Magnesium Iron Silicate - (Mg, Fe)2SiO4

Tektite

Natural impact glass

Olivine in Quartz/Feldspar Matrix (Peridotite or Granitic Pegmatite)

(Mg,Fe)2SiO4 (Olivine) with Quartz / Feldspar

Weathered iron-rich volcanic rock (probable basalt/scoria)

Basaltic volcanic rock; mainly plagioclase feldspar, pyroxene, and iron oxides

Peridot (Olivine)

Olivine, (Mg, Fe)2SiO4

Tumbled basalt (probable)

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine and iron oxides