Pyrite on Quartz matrix
Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Category
Organic Materia (Not A Rock Or Mineral)
Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.
Chert / Flint
Cryptocrystalline quartz (SiO2)
Sedimentary
Turquoise
Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
River Rock
Sedimentary Rock (various compositions)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)
sedimentary
Basalt with Quartz/Plagioclase Inclusions
Mafic volcanic rock (Basaltic)
igneous
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Milky Quartz Pebble (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Thunderegg (specifically a Jasper/Agate-filled Geode nodule)
Silicon Dioxide (SiO2) within Rhyolitic Matrix
igneous
Basalt with Quartz/Feldspar Inclusions
Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining
igneous
Limestone Breccia
Sedimentary Breccia (Calcareous)
sedimentary
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (primarily SiO2 with Feldspar)
sedimentary
Black Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Granite
Granite (composed mainly of Quartz, Feldspar, and Mica)
igneous
Green Jasper
Silicon Dioxide (SiO2) with impurities of iron(II) silicate
sedimentary
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Sandstone
Arenite
sedimentary
Milky Quartz with Mineral Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Dalmatian Stone
Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)
igneous
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Sandstone
Arenite (Siliclastic sedimentary rock), SiO2 + various minerals
sedimentary
Diorite (River Cobble)
Intermediate plutonic igneous rock
igneous
Eudialyte in Matrix
Na15Ca6Fe3Zr3Si26O72(OH,Cl,H2O)3
mineral
Sandstone
Sandstone (composed primarily of sand-sized minerals or rock grains)
sedimentary
Sandstone (Ferruginous)
Sandstone (mainly SiO2 with Fe2O3 staining)
sedimentary
Quartz Pebble (Water-worn Quartzite)
Silicon Dioxide (SiO2)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Bauxite
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Lapis Lazuli
Lazurite-dominant Metamorphic Rock (complex aluminosilicate)
metamorphic
Slag
Metallurgical by-product
Anthropogenic (Man-made material)
Quartz Vein in Host Rock (Gabbro or Basalt)
Silicon Dioxide (SiO2) with Mafic Silicates
metamorphic/igneous
Copper Ore (with Malachite and Azurite)
Hydroxide copper carbonate (Cu2CO3(OH)2 / Cu3(CO3)2(OH)2)
mineral
Sedimentary Breccia
Clastic Breccia (CaCO3/SiO2 matrix)
sedimentary
Conglomerate
Clastic sedimentary rock (Puddingstone)
sedimentary
Sandstone
Arenite (SiO2 based with quartz, feldspar, or lithic fragments)
sedimentary
Red Sandstone (Iron-Rich)
Arenite (Fe2O3)
sedimentary