Marble
Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)
Metamorphic Rock
Category
Anthropogenic (Man Made Artifact)
Browse anthropogenic (man made artifact) specimens identified by the Rock Identifier community.
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Epidote with Quartz and Feldspar
Ca2(Al2,Fe3+)(SiO4)3(OH) (Epidote complex)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Red Garnet
Pyrope-Almandine series (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)
mineral
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Ambergris
Ambrein (C30H52O Derivative)
Organic (Zoogenic)
Quartz
Silicon Dioxide (SiO2)
Mineral
Quartz
Quartz (Silicon Dioxide, SiO2)
Mineral
Diamond
Diamond (C)
Mineral
Granite
Granite (a common name for a felsic intrusive igneous rock)
Igneous Rock
Red Jasper (beads)
Silicon Dioxide (SiO2) with iron inclusions
Sedimentary Rock
Laterite
Laterite (primarily composed of hydrated oxides of iron and aluminum)
Sedimentary Rock (as a residual soil/rock, it's often considered a type of sedimentary rock due to its formation from weathering, though it can cross into soil science)
Granite
Granite (a plutonic igneous rock)
Igneous
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Ambergris (Geological/Organic Specimen)
Ambra grisea (Produced by Physeter macrocephalus)
organic material
Red Quartzite
Quartzite (SiO2 with iron oxide impurities)
metamorphic
Ruby in Zoisite
Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (specifically a rock composed of minerals)
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Mineral
Garnet Schist
Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)
metamorphic
Basalt
Basalt (Mafic Extrusive)
igneous
Quartz (Milky Quartz)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Lapis Lazuli
Lazurite-rich metamorphic rock (complex silicate)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Pyrite
Iron Pyrite (FeS₂)
Mineral
Greywacke (likely)
Greywacke (a type of sandstone)
Sedimentary
Red Jasper (with Quartz Veins)
Jasper (var. chert, SiO₂)
Sedimentary Rock (technically chert, a microcrystalline quartz)
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Basalt
Extrusive Mafic Igneous Rock (composed primarily of Plagioclase, Pyroxene, and Olivine)
igneous
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Granite (weathered/river-tumbled)
Granite (Plutonic Igneous Rock)
Igneous Rock
Sandstone
Sandstone (lithified arenite/wacke)
Sedimentary Rock
Green Aventurine and Clear Quartz
Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)
Mineral
Amethyst
SiO2 (Silicon Dioxide) - a variety of Quartz
Mineral
Orange Calcite
Calcite (CaCO3)
Mineral
Moonstone
Orthoclase Feldspar (KAlSi3O8)
Mineral
Rose Quartz
Rose Quartz (SiO₂)
Mineral
Crazy Lace Agate
Silicon Dioxide (SiO2) with iron and aluminum inclusions
sedimentary mineral
Sandstone
Arenite
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2 with impurities)
sedimentary