Beryl (var. Heliodor or Aquamarine)
Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)
mineral
Category
Mineral, Metal (Element)
Browse mineral, metal (element) specimens identified by the Rock Identifier community.
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Celestine (Celestite)
Strontium sulfate (SrSO4)
mineral
Dark metallic sulfide specimen, possibly galena
Galena (lead sulfide, PbS), identification tentative
mineral
Granite
Intrusive Igneous Rock
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pegmatitic granite (likely feldspar–quartz–mica rock)
Coarse-grained granitic pegmatite; primarily quartz (SiO₂), feldspar, and mica, with possible epidote or chlorite
igneous
Feldspar-Quartz Rock (likely Pegmatite or Granite)
Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)
igneous
Chalcopyrite (Peacock Ore)
Copper Iron Sulfide (CuFeS2)
mineral
Copper Ore
Mixed copper sulfides/oxides in gangue matrix
mineral
Lepidolite
K(Li,Al)3(Al,Si,3O10)(F,OH)2
mineral
Pyrite in Quartz
FeS2 (Iron Pyrite) with SiO2 (Quartz)
Mineral/Igneous/Hydrothermal
Copper Ore (with Azurite and Malachite)
Cuprite, Azurite (Cu3(CO3)2(OH)2), Malachite (Cu2(CO3)(OH)2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive igneous rock primarily composed of quartz, alkali feldspar, and plagioclase
igneous
Opalite
Synthetic Opalized Glass
gemstone
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
mineral
Sunstone
Oligoclase (Plagioclase Feldspar), (Ca,Na)(Al,Si)4O8
mineral
Galena
Lead(II) sulfide (PbS)
mineral
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
mineral
Gold Nugget
Native Gold (Au)
mineral
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Amygdaloidal Basalt
Basalt with secondary mineral infilling
igneous
Granite
Intrusive igneous rock
igneous
Rounded river pebble, possibly iron-rich quartzite or basalt
Indeterminate from image; likely fine-grained basalt (mafic silicate rock) or ferruginous quartzite
igneous
Iron-stained Quartz (Gossan/Limonite-coated Quartz)
Silicon Dioxide (SiO2) with Hydrated Iron Oxides (FeO(OH)·nH2O)
mineral
Quartz Vein Rock
Quartz (Silicon Dioxide, SiO2)
igneous
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone
Sandstone with Iron Oxide (Limonite/Goethite)
sedimentary
Ruby (mounted cabochon)
Corundum, Al₂O₃; red color typically from chromium
gemstone
Polished orange chalcedony pendant
Chalcedony, microcrystalline quartz (SiO₂), likely orange carnelian or orange agate
mineral
Green faceted gemstone earrings, likely synthetic emerald-colored glass or cubic zirconia
Undetermined; possible glass (amorphous silicate) or synthetic cubic zirconia (ZrO₂)
gemstone
Blue slag glass / industrial glass fragment
Artificial silicate glass, composition variable; likely copper- or cobalt-colored furnace slag
mineral
Granite
Felsic intrusive igneous rock
igneous
Cubic Zirconia (Jewelry Setting)
Zirconium Dioxide (ZrO2)
gemstone
Merlinite (dendritic opal)
Common opal (hydrated amorphous silica, SiO₂·nH₂O) with dark manganese-oxide dendrites; the trade name “merlinite” is also applied to other patterned stones.
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix
igneous
Amethyst cabochon jewelry
Amethyst, purple variety of quartz (SiO₂)
gemstone
Granite
Intrusive Igneous Rock
igneous
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N/A
Pyrite
Iron Sulfide (FeS2)
mineral