Botryoidal Hematite (Kidney Ore)
Iron(III) oxide (Fe2O3)
mineral
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Composed Of Multiple Minerals) in the encyclopedia
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Lapis Lazuli
Complex rock composed mainly of lazurite, calcite, and pyrite
gemstone
Gneiss (specifically a Hornblende Gneiss or Micaceous Gneiss)
Gneiss (metamorphic rock composed primarily of quartz, feldspar, and mafic minerals)
metamorphic
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Lapis Lazuli
Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Red-and-gray granitic gneiss
Gneiss, composed mainly of quartz, feldspar, and mica with iron-oxide staining
metamorphic
Quartz-veined Sandstone Pebble
Quartzite-veined Arenite
sedimentary
Banded Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Dragon Blood Jasper
SiO2
mineral
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Slate
Foliated Metamorphic Rock (composed mainly of clay minerals or micas)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Slate
Foliated Metamorphic Rock (composed primarily of silica and alumina with iron and magnesium)
metamorphic
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Gneiss (specifically Biotite Gneiss)
Gneiss (high-grade metamorphic rock primarily composed of Silicates)
metamorphic
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Mineral
Sandstone (Graywacke)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Bauxite
Bauxite (Al2O3·2H2O mixed with iron oxides)
sedimentary
Granite Pebble
Granite (Phaneritic Quartz-Feldspar Rock)
igneous
Zircon
Zircon (Zirconium Silicate, ZrSiO4)
mineral
Gneiss
Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
Granite
Granite (Phaneritic Igneous Rock)
igneous
Marble
Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)
metamorphic
Granite with Pyrite or Mica
Phaneritic intrusive igneous rock
igneous
Gneiss (specifically a Banded Gneiss cobble)
Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Slate
Metamorphic Rock (Fine-grained)
metamorphic
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, e.g., Antigorite, Lizardite, Chrysotile)
metamorphic
Greenstone / Serpentinite
Serpentinite (composed primarily of minerals from the serpentine group Mg3Si2O5(OH)4)
metamorphic
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Slate
Foliated Metamorphic Rock (primarily composed of Muscovite, Chlorite, and Quartz)
metamorphic
Gravel and Pebbles
Unconsolidated rock fragments / detrital sediment
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Red Sandstone
Sandstone (principally Quartz with Iron Oxide coating)
sedimentary
Red Sandstone
Arenite (Iron-rich)
sedimentary
Jasper and Agate Mix
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone
Arenite
Sedimentary
Quartz cluster, possibly druzy quartz on matrix
Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain
mineral
Chert with Calcite Veins
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions
sedimentary