Iron-rich rock fragment (possibly ironstone or limonite/goethite)
Likely ironstone composed largely of goethite/limonite; image alone cannot confirm
sedimentary
Category
Mineral (Extraterrestrial)
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Granite
Granite
Igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Unidentified dark metallic sulfide specimen
Possibly pyrite-, chalcopyrite-, or galena-bearing ore; exact identification requires testing
mineral
Likely serpentine-rich rock (serpentinite)
Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile); exact identification is uncertain from the image alone
metamorphic
Copper Ore Specimen
Cupriferous Rock / Malachite-bearing ore
mineral
Fluorite and Mineral Collection
Calcium Fluoride (CaF2)
mineral
Unidentified dark mineral/rock fragment
Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Tumbled quartz-rich pebble (likely quartzite or vein quartz)
Quartz (SiO₂), possibly quartzite with minor iron-oxide staining
metamorphic
Granite
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Magnetite (Lodestone)
Iron(II,III) oxide (Fe3O4)
mineral
Carved serpentine pendant
Serpentine-group minerals, commonly antigorite/lizardite (Mg₃Si₂O₅(OH)₄), possibly mixed with chlorite or other inclusions
mineral
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Orthoclase Feldspar (Potassium Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Iron-oxide-stained rock with a pale mineral vein
Likely limonite/goethite-stained quartz-bearing rock; exact identification is uncertain from the image
sedimentary
Sandstone
SiO2 (predominantly quartz sand)
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Ruby (Raw Corundum)
Al2O3 (Aluminum Oxide)
mineral
Likely weathered granite or granitic gneiss
Quartz–feldspar–mica rock; possibly gneissic granite
igneous
Quartz–feldspar pegmatite mineral specimen
Quartz (SiO₂) with potassium feldspar, albite, mica, and likely garnet or tourmaline
igneous
Magnetite
Fe3O4 (Iron(II,III) oxide)
mineral
Pyrite with Quartz
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
mineral
Tumbled pink granite
Granite, composed mainly of quartz, potassium feldspar, plagioclase, and dark mica or amphibole
igneous
Quartz in Limonite-rich Matrix
Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O
Mineral in Sedimentary/Secondary host
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Bornite
Bornite (Cu5FeS4)
mineral
Blue sodalite (likely)
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Limonite
FeO(OH)·nH2O
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Mica Schist or Muscovite
KAl2(AlSi3O10)(OH)2
metamorphic
Limonite with Gossan / Iron Ore
Hydrated iron oxide-hydroxide, approximately FeO(OH)·nH2O
mineral
Graphite
Graphite (Carbon, C)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
mineral
Specular Hematite
Hematite (Fe2O3)
mineral
Ironstone / Hematite
Iron(III) oxide (Fe2O3)
mineral
Celestite
Celestine (SrSO4)
mineral
Graphite
Graphite (Carbon, C)
mineral
Galena with Pyrite
Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)
mineral