Granite
Granite (phaneritic felsic intrusive rock)
igneous
Category
Mineral
Browse mineral specimens identified by the Rock Identifier community.
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Bauxite
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Iron-stained quartz (probable quartz vein fragment)
Quartz, SiO₂, with iron-oxide staining
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Weathered gneiss (probable)
Banded quartz–feldspar–mica gneiss
metamorphic
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Limonite (Ironstone)
FeO(OH)qn H2O
sedimentary
Limonite (Iron Ore)
Limonite (̑FeO(OH)·nH₂O)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Pyromorphite
Pyromorphite (Pb5(PO4)3Cl)
mineral
Fluorite (Fluorescent)
Calcium Fluoride (CaF2)
mineral
Likely rough quartz-bearing mineral specimen
Quartz (silicon dioxide, SiO₂), possibly iron-stained quartz or quartz-rich rock
mineral
Banded Metamorphic Rock
Gneiss or Schist
metamorphic
Tumbled serpentine (likely bowenite/antigorite)
Serpentine-group minerals, chiefly antigorite or lizardite; commonly Mg₃Si₂O₅(OH)₄
metamorphic
Vesicular basalt (scoriaceous basalt)
Basalt, primarily plagioclase, pyroxene, and iron-rich olivine; vesicular variety may be termed scoria
igneous
Felsic Drill Core (likely Gneiss or Granite)
Felsic Metamorphic Rock (Gneissic profile)
metamorphic
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Kunzite
Spodumene (LiAlSi2O6)
mineral
Epidote with Magnetite/Hematite inclusions
Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides
mineral
Fossil Shark Tooth
Odontaspididae (Sand Tiger Shark family)
fossil
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Chrysocolla
Cu2-xAlx(H2O)n(H2Si2O5)5 · nH2O (Hydrated copper aluminum silicate)
mineral
Purpurite
Manganese Iron Phosphate, Mn3+(PO4)
mineral
Druzy Quartz on Ironstone
Silicon Dioxide (SiO2) on Limonitic Ironstone
mineral
Banded Gneiss
Gneiss (pronounced 'nice')
metamorphic
Schist (Greenschist / Mica Schist)
Metamorphic rock rich in platy minerals (e.g., Chlorite/Mica schist)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt
Igneous
Granitic Pegmatite with Biotite
Pegmatitic Granite (contains KAlSi3O8, SiO2, K(Mg,Fe)3AlSi3O10(OH)2)
igneous
Sphalerite with Galena and Calcite / Quartz display specimens
Zinc Iron Sulfide (Zn,Fe)S with Quartz (SiO2) / Aquamarine / Fluorite
mineral
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Shattuckite (Blue Quartz/Jasper Matrix)
Shattuckite (Copper Silicate Hydroxide - Cu5(SiO3)4(OH)2)
mineral
Tumbled aqua glassy mineral specimen, likely chrysocolla or turquoise imitation
Uncertain from image; possible chrysocolla (hydrated copper aluminosilicate, variable composition) or dyed/man-made glass
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Turquoise or Chrysocolla (Inlaid Jewelry)
Hydrated copper aluminum phosphate / Hydrated copper phyllosilicate
mineral
Ironstone (likely Limonite or Goethite nodule)
Hydrothermally altered Ferric Hydroxide (FeO(OH)·nH2O)
sedimentary