White Quartz Pebble
Silicon Dioxide (SiO2)
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.
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Corundum (Sapphire)
Corundum (Al2O3)
mineral
Hypersthene
(Mg,Fe)SiO3 - Enstatite-Ferrosilite series
mineral
Pegmatite
Igneous Pegmatite (Quartz, Feldspar, Micas)
igneous
Black Sand (Magnetite/Heavy Mineral Concentrate)
Magnetite-rich Placers (Fe3O4)
sedimentary
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Scoria
Scoria (vesicular volcanic rock)
igneous
Chondrite Meteorite
Undifferentiated Chondrite
meteorite
Ruby Fuchsite / Ruby in Fuchsite
Ruby (Al2O3 variety corundum) and Fuchsite (K(Al,Cr)2AlSi3O10(OH)2 - a chromium-rich variety of muscovite mica) in Quartz matrix
Mineral
Ironstone Concretion
Ferruginous Sandstone / Hematite-rich Concretion
sedimentary
Red Garnet
Garnet Group (e.g., Pyrope, Almandine, Spessartine, Grossular, Andradite, Uvarovite)
Mineral
Grey Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Scoria
Scoria (Vesicular Basalt)
igneous
Satin Spar (Selenite Gypsum Sphere)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Mica in Quartz Host
Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz (SiO2)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Pink Sapphire
Corundum (Al2O3 with Chromium/Titanium/Iron traces)
mineral
Amazonite
Microcline (variety Amazonite) - K(AlSi3O8)
mineral
Serpentine
Hydrous magnesium iron silicate, (Mg,Fe)3Si2O5(OH)4
metamorphic
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Zoisite with Ruby or Rubellite in Fuchsite
Anyolite (K(Al,Cr)2(AlSi3O10)(OH)2 with (Ca2Al3(SiO4)(Si2O7)O(OH)))
metamorphic
Fluorite (Green Fluorite)
Calcium Fluoride (CaF2)
mineral
Ruby
Corundum (Al2O3 with Chromium)
mineral
Pyrite in Quartz Matrix
Iron Disulfide (FeS2) in Silicon Dioxide (SiO2)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with inclusions)
mineral
Chalcedony (Agate/Carnelian variety)
Cryptocrystalline Quartz (SiO2)
mineral
Peridot
Olivine ((Mg, Fe)2SiO4)
gemstone
Pegmatite
Pegmatite (felsic intrusive igneous rock)
igneous
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (Mica)
mineral
Quartz (Iron-Stained or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Bull Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Mineral/Mineraloid within a rock matrix
Scoria (Vesicular Basalt)
Scoria (Vesicular Igneous Rock)
igneous
Almandine Garnet & Tumbled Citrine Quartz
Fe3Al2(SiO4)3 (Garnet) and SiO2 (Quartz)
mineral
Amazonite
Microcline (KAlSi3O8 variant)
mineral
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Ruby
Corundum (Aluminum Oxide with Chromium traces), Al2O3:Cr
mineral
Ruby
Corundum (Al2O3:Cr)
mineral
Chalcedony (Agate/Quartz variety)
Cryptocrystalline Quartz (SiO2)
mineral