Porphyritic Basalt (Chinese Writing Stone or Flower Stone)
Porphyritic Basalt / Porphyry
igneous
Category
Man Made Rock Like Material
Browse man made rock like material specimens identified by the Rock Identifier community.
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)
metamorphic
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Quartz Druzy Geode
Silicon Dioxide (SiO2) - Crystalline Variety
mineral
Tektite (likely Australite)
Tektite (no specific chemical formula as it's a natural glass of variable composition, mostly SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O, TiO2)
Mineral (specifically a mineraloid)
Native Silver
Silver (Ag)
mineral
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Tufa
Calcareous Tufa (CaCO3)
sedimentary
Banded Chert
Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)
Sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Banded Calcite (Cave Onyx)
Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
sedimentary
Mica (Muscovite)
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Lapis Lazuli
Lapis lazuli (a rock primarily composed of Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Orange Quartzite / Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions
metamorphic
Chert (often called Flint or Jasper based on color)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Jade
Jadeite or Nephrite
Mineral/Mineraloid
Garnet (likely Pyrope or Almandine)
Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.
Mineral
Quartzite (Iron-stained)
Quartzite (SiO2 with Fe-oxides)
metamorphic
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond
Diamond (C)
Mineral
Crushed Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Sandstone (Painted)
Arenite (primarily SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')
Silicon Dioxide (SiO2) with artificial pigment
mineral
Sandstone (Quartzose type)
Arenite (primarily SiO2)
sedimentary
Basalt (Water-worn pebble)
Mafic Igneous Rock (primarily Plagioclase feldspar and Pyroxene)
igneous
Chert (variant Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (and Fossilized Brachiopod shell)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Limonite (Iron Ore)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Desert Rose (Baryte or Selenite variant)
Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic