Charnockite
Orthopyroxene-bearing granite (Charnockite)
metamorphic
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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Greenschist
Greenschist (chlorite-epidote schist)
metamorphic
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Yellow Chalcedony (Carnelian/Yellow Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Chrysocolla on Matrix
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Blue-green raw mineral specimen, likely apatite
Fluorapatite, Ca₅(PO₄)₃F (probable; visual identification only)
mineral
Yellow Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Aventurine (Green Aventurine)
Quartz with Fuchsite Inclusions (SiO2)
Mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Black Garnet (Melanite)
Andradite, Ca3Fe2(SiO4)3
mineral
Quartz Vein in Schist / Gneiss
Silicon Dioxide (SiO2) in Metamorphic Matrix
igneous
Citrine
Quartz (SiO₂) variety
Mineral
Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.
SiO2 (Silicon Dioxide)
Mineral or Sedimentary (if chert)
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix
metamorphic
Blue Zircon
Zirconium Silicate (ZrSiO4)
mineral
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Smoky Quartz with Chert
Silicon Dioxide (SiO2)
mineral
Pyrite
Pyrite (FeS₂)
Mineral
Serpentine
Serpentine group minerals (e.g., Antigorite, Chrysotile, Lizardite). Chemical formula: (Mg, Fe)₃Si₂O₅(OH)₄
Mineral, often found as a rock (metamorphic)
Corundum (Sapphire in Matrix)
Aluminum Oxide (Al2O3)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Agate (specifically Sardonyx or Red Agate)
Silicon Dioxide (SiO2)
mineral
Citrine
SiO2 (Silicon Dioxide)
mineral
Green Quartz (including Prase or Aventurine variants)
Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)
mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Dragon Blood Jasper
Epidote and Pietersite-rich Quartz (SiO2 with inclusions)
sedimentary
Garnetiferous Quartzite (Garnet Gneiss Pebble)
Garnet-bearing Quartzite or Quartz-Feldspar Gneiss
metamorphic
Banded Agate (often called Brown Agate or Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Banded Agate
Silicon Dioxide (SiO2)
mineral
Ruby (Raw Corundum)
Corundum (Al2O3) with Chromium traces
mineral
K-Feldspar (Potassium Feldspar)
Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Rhodonite in Quartz Matrix
Rhodonite (Manganese Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Quartz Sand Gravel
Silicon Dioxide (SiO2)
sedimentary
Banded Agate (Tumbled)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Yellow Quartz (Citrine or Yellow Chalcedony)
Silicon Dioxide (SiO2)
mineral