Chert (Arrowhead Preform or Point)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Pyrite (on Quartz/Host Rock)
Iron Sulfide (FeS₂)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose)
Arenite (composed mainly of SiO2)
sedimentary
Indigo Gabbro
Gabbro (MaFIC intrusive rock)
igneous
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
metamorphic
Granite (Thin Section)
Granite (Felsic Plutonic Rock)
igneous
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Demantoid Garnet on Matrix
Demantoid (variety of Andradite Garnet) - Ca3(Fe3+)2(SiO4)3
mineral
Sandstone (Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (with Lichen)
Arenite (composed primarily of SiO2)
sedimentary
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Carnelian and White Quartz Bracelet
Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz
mineral
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Granitic Pegmatite
Pegmatitic Granite
igneous
Sandstone (with Iron Staining)
Clastic sedimentary rock (High Silica / Iron Oxide)
sedimentary
Pyrite with Iron Oxides (Fool's Gold in Matrix)
Iron Sulfide (FeS2)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Pebble (river rock/beach pebble)
Pebble (clast size class)
Sedimentary Rock
Sandstone
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Red Sandstone (Old Red Sandstone)
Ferruginous Sandstone (SiO2 + Fe2O3)
sedimentary
Granite
Phaneritic plutonic rock (composed of Quartz, Feldspar, and Mica/Amphibole)
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Greywacke (likely)
Greywacke (a type of sandstone)
Sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Rhodonite beads (possibly dyed or treated, or lower quality Rhodonite)
Manganese inosilicate, (Mn,Fe,Mg,Ca)SiO3
Mineral
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)
igneous
Lapis Lazuli (Low Grade)
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Basalt
Extrusive mafic igneous rock; primarily (Ca,Na)(Mg,Fe,Al,Si)2O6 with (Ca,Na)(Al,Si)4O8
igneous
Sandstone (Ferruginous)
Arenite (with iron oxide cement)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Fossiliferous)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Lapis Lazuli
Lazurite (primary mineral component), (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
metamorphic
Sandstone (lithic/greywacke variant)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
Sandstone
Arenite
sedimentary
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite)
Metamorphic rock
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Bauxite (Laterite Clay)
Bauxite (mixture of Hydrous Aluminum Oxides: Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))
sedimentary
Gneiss (specifically Biotite Gneiss)
Gneiss (high-grade metamorphic rock primarily composed of Silicates)
metamorphic