Bauxite (Laterite)
Hydrated aluminum oxides (Al2O3·nH2O)
sedimentary
Category
Synthetic (Not A Rock Or Mineral)
Browse synthetic (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Synthetic (Not A Rock Or Mineral) in the encyclopedia
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Amygdaloidal Basalt
Basalt with Secondary Mineral Infillings
igneous
Amethyst Quartz Druse
Silicon Dioxide (SiO2) with iron impurities
mineral
Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Quartzite with Schist layers
Metamorphosed Quartz-rich Rock (Mixed Schist/Quartzite)
metamorphic
Porphyry (Porphyritic Basalt / Andesite)
Porphyritic Igneous Rock
igneous
Quartz (on matrix)
Quartz (Silicon Dioxide, SiO₂)
Mineral
Plume Agate or Moss Agate
Agate (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Quartzite with Iron Staining
Metamorphic Quartz Sandstone
metamorphic
Desert Rose (Barite Rose or Gypsum Rose)
Barium Sulfate (BaSO4) / Hydrated Calcium Sulfate (CaSO4·2H2O)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Siltstone
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Granitic Pegmatite
Pegmatitic Granite
igneous
Schist
Schist (metamorphic rock)
metamorphic
Porphyritic Igneous Rock / Rhyolite Porphyry
Porphyritic volcanic rock
igneous
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz-lined Geode / Chalcedony Nodule
Silicon Dioxide (SiO2)
sedimentary
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Schist
Schist (Foliated Metamorphic Rock)
metamorphic
Weathered granitic rock fragment
Granite, predominantly quartz–feldspar–mica assemblage
igneous
Clear Quartz (Faceted)
Silicon Dioxide (SiO2)
gemstone
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Druzy Quartz on Chert/Siltstone
Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix
sedimentary
Quartz (Smoky/Granular variety)
Silicon Dioxide (SiO2)
mineral
Quartz with Host Rock
Silicon Dioxide (SiO2)
mineral
Sandstone (Weathered Fragment)
Clastic Sedimentary Rock
sedimentary
Serpentine
Antigorite/Lizardite/Chrysotile group, Mg3Si2O5(OH)4
metamorphic
Serpentine
Antigorite/Lizardite (Mg, Fe)3Si2O5(OH)4
metamorphic
Sandstone
Arenite
sedimentary
Massive Quartz (Milky or Gray)
Silicon Dioxide (SiO2)
mineral
Leopard Skin Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Sandstone Pebble
Arenite (SiO2 complex)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Granite Pebble (Pegmatitic Quartz-Feldspar River Rock)
Granite / Quartz-Feldspar-Mica Aggregate
igneous
Sandstone (Wonderstone)
Arenite (composed primarily of SiO2 with Fe2O3 impurities)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary