Red cabochon gemstone, likely carnelian or red agate
Cryptocrystalline quartz (chalcedony), SiO₂
gemstone
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Chrysocolla Cuprite
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) and Cu2O (Cuprite)
mineral composite
Limestone
CaCO3 (principally Calcite)
sedimentary
Unakite
Unakite (Altered Granite composed of Orthoclase KAlSi3O8, Epidote Ca2(Al, Fe)3(SiO4)3(OH), and Quartz SiO2)
metamorphic
Mixed polished gemstone bead bracelet, likely ocean jasper, agate, and quartz varieties
Mostly microcrystalline quartz (SiO₂), with possible chalcedony, jasper, and minor feldspar or other inclusions
gemstone
Sandstone (Red Sandstone)
Arenite
sedimentary
Graphite-rich schist (probable graphite flake)
Graphite (C) in graphitic schist; possibly graphite-bearing phyllite
metamorphic
Concrete with Aggregate
Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)
anthropogenic (human-made) sedimentary-like material
Sandstone
Arenite (SiO2 primarily)
sedimentary
Greenschist
Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)
metamorphic
Brick
Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)
Man-made material (constructed)
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Quartz with Iron Oxide
SiO2
mineral
Carved turquoise arrowhead/pendant
Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Hand-Drawn Trading Card (Amateur Artwork)
Cellulose-based substrate with wax/graphite/ink deposit (n/a for minerals)
Organic/Synthetic Composite (Paper and Pigment)
Sandstone
Arenite (SiO2 based)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH), AlOOH)
sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 + Fe2O3)
sedimentary
Small tumbled blue-green stone, possibly chrysocolla or turquoise
Indeterminate copper-bearing mineral; possible chrysocolla (Cu₂H₂Si₂O₅(OH)₄·nH₂O) or turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O)
mineral
Unakite
Epidotized Granite
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red Garnet (likely Almandine or Pyrope)
Garnet group: X3Y2(SiO4)3 (e.g., Almandine: Fe3Al2Si3O12)
mineral
Turquoise cabochon (likely stabilized or imitation)
Turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Chakra Stone (Composite / Man-made Bonded Gemstones)
Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)
Combined Minerals / Metaphysical stones
Quartz Sand Gravel
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (Sandstone)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Anthracite Coal
Anthracite coal (High-rank coal)
sedimentary
Ruby in Zoisite
Anyolite (composite of Corundum Al2O3 and Zoisite Ca2Al3(SiO4)(Si2O7)O(OH))
metamorphic
Turquoise ring (likely stabilized or imitation turquoise)
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact material is uncertain from the image
gemstone
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Granite
Granite (Phaneritic Quartz-Feldspar-Mica composite)
igneous
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (composed of SiO2, CaCO3, or Fe2O3 cement)
sedimentary
Blue-green chrysocolla rough specimen
Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite
mineral
Basalt
Extrusive Igneous Rock
igneous
Limonite (Iron Ore)
Hydrated ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Bauxite
Bauxite (mixture of Gibbiste Al(OH)3, Boehmite ̳-AlO(OH), and Diaspore ́-AlO(OH))
sedimentary
Sandstone Pebble
Arenite (Siliclastic sedimentary rock)
sedimentary
Muscovite Mica Schist
Metamorphic Rock (Muscovite-Biotite Schist)
metamorphic
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary