Yellow Ochre / Limonite
Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)
mineral
Category
Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)
Browse industrial byproduct (often confused with igneous rocks or meteorites) specimens identified by the Rock Identifier community.
Learn about Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites) in the encyclopedia
View all →
White Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Mica (specimen appears to be Muscovite or Phlogopite)
Phyllosilicate mineral; Muscovite: KAl2(AlSi3O10)(F,OH)2
Mineral (Found in Igneous and Metamorphic rocks)
Black Tourmaline
Schorl (complex sodium iron aluminum borosilicate)
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Garnet
Group of silicate minerals (e.g., Almandine: Fe3Al2(SiO4)3)
gemstone
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Basalt
Extrusive Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)
igneous
Carnelian Agate
Chalcedony (SiO2 with Iron Oxides)
sedimentary
Cloudy Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt
Extrusive mafic igneous rock
igneous
Grey Agate
Silicon Dioxide (SiO2) - variety: Agate/Chalcedony
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Andesite
Intermediate Volcanic Rock (Andesite)
igneous
Ruby
Corundum (Al2O3)
mineral
Pink Sapphire
Corundum (Al2O3) with Chromium/Iron/Titanium trace impurities
mineral
Tumbled blue-green stone, likely aquamarine-bearing pegmatite or blue apatite
Probable fluorapatite, Ca5(PO4)3(F,Cl,OH), though visual identification is uncertain
mineral
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt
Basalt (Aphanitic extrusive igneous rock)
igneous
Clear Quartz (Faceted Crystal)
Silicon Dioxide (SiO2)
mineral
Raw Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Granite
Granitoid (dominated by Quartz and Feldspar)
igneous
Quartz-rich rock with chlorite/epidote vein
Milky quartz with green chlorite or epidote; exact identification requires testing
metamorphic
Quartz (Iron-stained or Chalcedony varieties)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2 with iron impurities)
mineral
Chalcedony (Agate/Carnelian)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
Metamorphic
Blue Sapphire Crystal (Rough)
Corundum (Aluminum Oxide, Al2O3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Pyrite
Iron Sulfide (FeS2)
mineral
Biotite (Mica)
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Mica Schist with Quartz
Mica Schist (primarily Muscovite or Biotite with Quartz)
metamorphic
Milky Quartz (Water-Worn Pebble)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Sugilite
Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)
mineral