Red Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Category
Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)
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Peridotite (with Olivine and Pyroxene)
Ultramafic Magmatic Rock (Primary minerals: (Mg, Fe)2SiO4 and (Ca, Mg, Fe)2Si2O6)
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Gneiss
Gneiss
metamorphic
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Corundum (Pink Sapphire / Ruby)
Al2O3 (Aluminum Oxide)
mineral
Sapphire
Corundum (Al2O3)
mineral
Magnetite / Ironstone
Magnetite (Fe3O4)
mineral
Blue-dyed howlite beads (likely)
Howlite, Ca₂B₅SiO₉(OH)₅, commonly dyed blue to imitate turquoise
mineral
Ironstone concretion
Siderite or Limonite-rich Concretion (FeO(OH)·nH2O)
sedimentary
Ironstone Nodule
Ironstone (Ferruginous Rock)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Pegmatite
Granitic Pegmatite
igneous
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Metamorphic
Iron Meteorite (Candidate)
Siderite (Meteoric Iron)
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Zircon
Zircon (Zirconium Silicate - ZrSiO4)
mineral
Magnetite (potentially Hematite-rich)
Magnetite (Fe3O4)
mineral
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Garnet
Garnet Group (e.g., Almandine Fe3Al2(SiO4)3 or Pyrope Mg3Al2(SiO4)3)
mineral
Sapphire
Corundum (Al2O3)
gemstone
Yellow Sapphire
Corundum (Al2O3:Fe)
gemstone
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Blue Apatite
Apatite (Ca5(PO4)3(F,Cl,OH))
mineral
Rough Corundum (Sapphire/Ruby mixture)
Corundum (Aluminum Oxide, Al2O3)
mineral
Fuchsite in Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 (Muscovite with Chromium)
metamorphic
Kaolinite (Kaolin)
Kaolinite (Al2Si2O5(OH)4)
mineral
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Iron Concretion
Ferruginous concretion (Fe2O3·nH2O / FeO(OH))
sedimentary
Ruby (in jewelry)
Corundum (Al2O3 with Chromium traces)
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Sapphire
Corundum (Al2O3)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral