Porphyry (likely Porphyritic Andesite or Basalt)
Porphyritic Igneous Rock
igneous
Category
Mineral, Possibly Rock Fragment Containing A Mineral
Browse mineral, possibly rock fragment containing a mineral specimens identified by the Rock Identifier community.
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Sunstone (Feldspar variety)
Oligoclase or Andesine (Na,Ca)(Al,Si)4O8
mineral
Tektite (Indochinite)
Tektite (Silica-rich natural glass)
mineral
Specular Hematite Geode/Nodule
Specularite (Polycrystalline Hematite), Fe2O3
mineral
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Banded Calcite (often sold as Caribbean Calcite or Honey Calcite)
Calcium Carbonate (CaCO3)
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Dragon Blood Jasper
Epidote-containing Quartz and Chlorite (SiO2 + (Ca2(Al, Fe)3(SiO4)3(OH)))
sedimentary
Ferruginous Sandstone
Arenite with Iron-oxide cement
sedimentary
Sparkling Druzy Quartz on Matrix
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Limestone (Concretionary or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
sedimentary
Basalt with Quartz/Calcite matrix
Basalt (SiO2 with Ca/Mg/Fe silicates) on a Mineral Matrix
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Calcite
Calcite (CaCO3)
Mineral
Green Aventurine (Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (Mica)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Larvikite
Monzonite (intermediate intrusive igneous rock containing plagioclase, alkali feldspar, augite, and biotite)
igneous
Emerald with Matrix (Emerald in Mica Schist)
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Sea Glass
Amorphous Silica (Anthropogenic glass) - SiO2
mineral
Ironstone (Limonitic Sandstone)
Ferruginous Sandstone (rich in Limonite: FeO(OH)·nH2O)
sedimentary
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Bituminous Coal
Organic sedimentary rock (humic coal)
sedimentary
Granite
Granite
Igneous
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Oolite (Ooid Limestone)
Ooidal Limestone (comprised of CaCO3)
sedimentary
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) with Quartz crystals
sedimentary
Specular Hematite and Magnetite Ore
Iron Oxide (Fe2O3 and Fe3O4)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Gneiss
Gneiss (a type of metamorphic rock)
Metamorphic Rock
Red Jasper with Quartz Veining
Jasper (Silicon Dioxide, SiO2) with Quartz (SiO2) inclusions
sedimentary
Megalodon Shark Tooth (Partial Fossil)
Otodus megalodon (fossilized in Calcium Phosphate/Apatite)
Mineral/Fossil
Chondrite Meteorite
Ordinary Chondrite (OC)
igneous
Granite (Leucogranite)
Felsic Plutonic Rock (Granite)
igneous