Meteorite (Extraterrestrial Material)

Olivine (Peridotite)

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

Olivine (Peridot when gem-quality)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Bronzite

(Mg,Fe)SiO3

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) / Scoriaceous Basalt (Host Rock)

Weathered sandstone or iron-rich sedimentary rock

Indeterminate siliciclastic rock; likely quartz-rich sandstone with iron-oxide staining

Olivine in Basalt matrix

Peridotite (Mg, Fe)2SiO4

Peridot (Olivine)

Olivine ((Mg, Fe)2SiO4)

Ironstone Concretion (Limonite/Hematite Nodules)

Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)

Peridot (Olivine)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Unidentified brown rock fragment

Indeterminate from image; likely a weathered iron-rich lithic fragment

Weathered iron-rich rock, possibly laterite or limonite-bearing sandstone

Laterite/limonite-rich material; commonly dominated by goethite (FeO(OH)) and hydrated iron oxides

Peridot ring

Gem-quality olivine, typically forsterite–fayalite solid solution ((Mg,Fe)₂SiO₄)

Polished vesicular basalt (likely iron-rich volcanic rock)

Basalt, predominantly plagioclase–pyroxene–olivine; surface may include iron-oxide minerals or metallic-looking infill

Goethite / Limonite Concretion

Iron Hydroxide Oxide (FeO(OH))

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Faceted yellow-green gemstone, likely peridot

Olivine, typically forsterite-rich (Mg₂SiO₄)

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Pumice (likely basaltic pumice/scoria)

Vesicular volcanic rock, commonly basaltic; mainly plagioclase, pyroxene, and volcanic glass

Silicon Carbide (Carborundum)

Silicon Carbide, SiC

Olivine (Peridotite)

Magnesium iron silicate (Mg, Fe)2SiO4

Unidentified small rock fragments

Indeterminate from image; possibly quartz-rich material

Olivine (peridot) grain

Olivine-group silicate, typically forsterite–fayalite solid solution: (Mg,Fe)₂SiO₄

Moissanite

Silicon Carbide (SiC)

Weathered iron-rich limestone or marl

Calcitic carbonate rock with limonite/goethite and clay impurities (predominantly CaCO₃)

Carbonaceous Chondrite (CV3 type)

Carbonaceous Chondrite (CV3 group)

Polished peridot (olivine) cabochon

Olivine, typically forsterite-rich: (Mg,Fe)₂SiO₄

Olivine Peridotite

Peridotite (comprising Olivine (Mg,Fe)2SiO4 and Pyroxene)

Olivine (Peridotite)

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

Sandstone with Ironstone Concretion

Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))

Olivine (Peridot)

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

Iron Slag

Ferrous Slag (Industrial Byproduct)

Likely polished basalt with pale mineral inclusions

Basalt; inclusions possibly calcite, quartz, or weathered feldspar

Possible tektite or iron-rich slag-like natural specimen

Uncertain; possibly natural glass (tektite) or magnetite-rich rock

Ironstone Concretion (Boxwork)

Siderite-Limonite Concretion (FeO(OH)·nH2O)

Shiva Lingam

Cryptocrystalline Quartz (Jasproid/Sandstone) with Iron Oxide (Fe2O3)

Peridot (Olivine)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Olivine (Peridot)

Olivine Group (Mg,Fe)2SiO4

Likely assorted beach/river pebbles

Undetermined mixed lithologies; visible pieces may include quartz-rich and volcanic rocks

Olivine

Olivine group (Mg, Fe)2SiO4

Slag (Industrial Glass Slag)

Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)