Ruby
Corundum (Al2O3 with Chromium traces)
Category
Browse industrial byproduct (often confused with igneous rocks or meteorites) specimens identified by the Rock Identifier community.
Ruby
Corundum (Al2O3 with Chromium traces)
Ruby (Corundum)
Al2O3 (Aluminium oxide with Chromium impurities)
Quartz Pebble
Silicon Dioxide (SiO2)
Chinese Writing Stone
Porphyritic Basalt (or Andesite) with Feldspar inclusions
Scoria (Lava Rock)
Scoria (extrusive volcanic rock)
Red Scoria (Lava Rock)
Scoria (Vesicular Basalt)
Chalcedony (Agate/Chert)
Silicon Dioxide (SiO₂)
Blue Star Sapphire
Corundum (Al2O3)
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
Variscite
Variscite (AlPO4·2H2O)
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
Greenschist
Greenschist (Chlorite-actinolite schist)
Blue Apatite
Apatite, Ca5(PO4)3(F,Cl,OH)
Ruby (Corundum)
Corundum (Aluminum Oxide) with chromium trace elements, Al2O3
Topaz
Topaz (Al2SiO4(F,OH)2)
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
Serpentine (Serpentinite)
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe)2O5(OH)4)
Magnetite
Magnetite (Iron(II,III) oxide, Fe3O4)
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
Corundum
Corundum (Aluminium oxide, Al2O3)
Quartz Pebble
Silicon Dioxide (SiO2)
Green Quartz (Aventurine or Prase)
Silicon Dioxide (SiO2) with inclusions
Yellow Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
Quartz Pebble (with Hematite Inclusions)
Silicon Dioxide (SiO2)
Epidote
Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))
Orbicular jasper (likely ocean jasper)
Silica-rich microcrystalline quartz/chalcedony with iron-oxide and other mineral inclusions; commonly classified as orbicular jasper
Amazonite
Microcline (variety Amazonite), K(AlSi3O8)
Diamond in Kimberlite
Kimberlite host rock with C (Carbon) inclusion
Sodalite
Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)
Turquoise and Hematite
CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Fe2O3 (Hematite)
Quartz (Iron-Stained)
Crystalline Silicon Dioxide (SiO2)
Crushed Stone (Basalt/Gabbro)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
Ruby
Corundum (Al2O3)
Purple Garnet
Magnesium Aluminum Silicate (Pyrope-Almandine series) Mg3Al2(SiO4)3
Rhodonite
Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix
Agate
Silicon Dioxide (SiO2)
Sodalite
Sodalite (Na4Al3Si3O12Cl)
Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
Dragon Blood Jasper
Epidote with Red Piedmontite (silicate)
Green Aventurine
Quartz containing Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)