Chert (variously identified as Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Anthropogenic Material (Man Made Rock)
Browse anthropogenic material (man made rock) specimens identified by the Rock Identifier community.
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Garnet Beads
Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)
Mineral
Sandstone (Red Flagstone)
Clastic sedimentary rock (primarily Quartz - SiO2)
sedimentary
Granite
Granite (a felsic intrusive igneous rock)
igneous
Red Jasper (beads)
SiO₂ (Silicon Dioxide)
Mineral, variety of chalcedony (microcrystalline quartz)
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
igneous
Slate
Slate (Regional metamorphic rock composed primarily of quartz, illite, and chlorite)
metamorphic
Pink Granite
Granite (Phaneritic Acid Igneous Rock)
igneous
Greenstone / Epidosite
Epidosite (Metasomatic rock consisting mainly of Epidite Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz)
metamorphic
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Epidote with Feldspar/Quartz (Unakite-like)
Epidotized Granite (Ca2(Al,Fe)3(SiO4)3(OH) + KAlSi3O8)
metamorphic
Greisen (Quartz-Muscovite-Turretine Rock)
Greisen
Metamorphic Rock
Granite (weathered/river-tumbled)
Granite (Plutonic Igneous Rock)
Igneous Rock
Gneiss
Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Quartz (chalcedony variety) or Limestone with Quartz Veins
SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)
Mineral or Sedimentary Rock (with mineral inclusions)
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Ferruginous Sandstone
Sandstone, Iron-rich
sedimentary
Granite (tumbled pebble)
Granite (Plutonic Igneous Rock)
Igneous Rock
Calcite
Calcite (CaCO3)
Mineral
Marble
Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Mica Schist
Foliated Metamorphic Rock (rich in Muscovite or Biotite)
metamorphic
Chert (specifically Iron-stained River Cobble)
Silicon Dioxide (SiO2)
sedimentary
Sandstone with trace fossil
Sandstone, possibly with Skolithos or similar trace fossil
sedimentary
Greywacke (River Pebble)
Greywacke sandstone with quartz veining
sedimentary
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Granite (likely a river or beach pebble)
Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)
Igneous
Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)
Jasper, microcrystalline quartz (SiO₂)
Sedimentary Rock
Meteorite (Chondrite)
Stony Meteorite (Ordinary Chondrite)
igneous
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Quartz with Basalt inclusion
Silicon Dioxide (SiO2) with mafic silicate rock
igneous and sedimentary/metamorphic mix
Quartz (likely macrocrystalline variety)
Quartz (SiO₂)
Mineral
Red Sandstone
Arenite (ferruginous sandstone)
sedimentary
Granite
Phaneritic Felsic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)
igneous
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Basalt
Basalt
Igneous
Slate
Slate (foliated metamorphic rock, primarily composed of quartz, illite, chlorite, and micas)
metamorphic
Granite
Granite
igneous