Libyan Desert Glass
Impactite (High-silica tektite)
mineral
Category
Granite
Browse granite specimens identified by the Rock Identifier community.
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Pearl
Calcium Carbonate (CaCO3) + Conchiolin
mineral
Amber
Succinite (Formula: C10H16O)
Organic Mineraloid
Chert (concretionary/nodular variant)
Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions
sedimentary
Dyed Pink Quartzite (Jadeite Simulant)
Silicon Dioxide (SiO2) with organic dye
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Mystic Topaz
Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)
mineral
Basalt Pebble
Basalt
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Cubic Zirconia (in Jewelry)
Zirconium Dioxide (ZrO2)
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Obsidian
Vitreous volcanic silicate (70-75% SiO2)
igneous
Desert Rose (Gypsum/Baryte)
Hydrated Calcium Sulfate (CaSO4·2H2O)
mineral
Chert (and Chert Flake)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Siltstone Pebble
Siltstone
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sulfur
Sulfur (S8)
mineral
Fluorite Tower
Calcium Fluoride (CaF2)
mineral
Gold
Gold (Native Element); Au
mineral
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (Yellow Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Brachiopod Fossil in Limestone
Phylum Brachiopoda, Class Rhynchonellata
sedimentary
Amethyst (Tumbled)
Amethyst (Silicon Dioxide, SiO2 + Fe4+)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Green Jasper
Jasper (Silicates, SiO2)
sedimentary
Carnelian
Carnelian (SiO2 variant)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Amethyst (Rose-tinted variation)
Silicon Dioxide (SiO2) with trace iron impurities
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Turquoise color-bead and Hematite necklace
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)
mineral
Halite
Halite (NaCl)
mineral