Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Satin Spar (Gypsum)
Hydrous calcium sulfate (CaSO4·2H2O)
mineral
Milk Quartz (White) and Yellow Aventurine (Yellow)
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Quartzite
Quartzite (primarily SiO₂)
metamorphic
Red Jasper (possibly banded)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Fossil Shell (Bivalve)
Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3
sedimentary
Sandstone with Manganese Dendrites/Oxide coatings
Arenite with Pyrolusite and Romanechite (MnO2)
sedimentary
Gneiss (specifically Granitic Gneiss)
Gneissic Metamorphic Rock
metamorphic
Vesicular Basalt (Scoria)
Vesicular Basalt
igneous
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Basalt
Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)
igneous
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Giallo Ornamental Granite
Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Serpentine
Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)
Metamorphic rock
Chert Conglomerate (or Breccia)
Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)
sedimentary
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Limonite (Iron Stone)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Serpentine Jade (New Jade/Olive Jade)
Serpentinite (a rock composed primarily of serpentine minerals) / Mg3Si2O5(OH)4 for Antigorite and Lizardite
Mineral
Red Sandstone
Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)
sedimentary
Garnet-Bearing Gneiss
Almandine-Garnet Gneiss
metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Gneiss (Metamorphic Rock)
Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)
metamorphic
Druzy Quartz Geode (likely Smokey Quartz variety)
Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.
Mineral structure/Rock
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone with Iron Oxide (Limonite/Hematite)
Ferruginous Sandstone (SiO2 with FeO(OH)·nH2O)
sedimentary
Leopard Skin Jasper
Orbicular Rhyolite (Silicon Dioxide with various impurities)
sedimentary
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Dacite
Dacite (Intermediate volcanic rock)
igneous
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Chert / Flint
Chert (Silicon Dioxide, SiO2)
sedimentary
Wood Beads (Palmwood/Ebony)
Various species for wood, but often refers to woods like Palmwood (e.g., Borassus flabellifer) or Ebony (Diospyros spp.) for their distinctive grain and hardness.
Organic Gem Material (Botanical)
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Rhyolite
Rhyolite (High-silica volcanic rock)
igneous
Diamond
Diamond (pure Carbon, C)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Optical Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Talc
Talc (Mg₃Si₄O₁₀(OH)₂)
Mineral
Pyrite (Fool's Gold) Ore
Iron Disulfide (FeS2)
mineral