Jasper Agate (specifically Brecciated Jasper with Agate inclusions)
Silicon Dioxide (SiO2)
mineral
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
Browse man made material, not a natural rock or mineral specimen specimens identified by the Rock Identifier community.
Turquoise
Hydrous phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral / metamorphic
Chert / Flint
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2) / Rock Crystal
mineral
Limonite (Iron Stone)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Bloodstone (also known as Heliotrope)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Granite
Phaneritic Igneous Rock (Granitic)
igneous
Red Jasper
Silicon dioxide (SiO2) with iron oxide (Fe2O3) inclusions
sedimentary/mineral
Citrine
Silicon Dioxide (SiO2) with iron impurities
Mineral
Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2 - a variety of actinolite, an amphibole mineral); Jadeite (Na(Al,Fe3+)Si2O6 - a pyroxene mineral)
Metamorphic rock (for both Nephrite and Jadeite)
Hag Stone
Siltstone or Fine-grained Sandstone with boring (e.g., Lithophaga impact)
sedimentary
Granite
Phaneritic high-silica plutonic rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Diorite
Phaneritic Intermediate Plutonic Rock (Diorite)
igneous
Ferruginous Conglomerate
Conglomerate with Iron-Oxide Matrix (SiO2 + Fe2O3/FeO(OH))
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Black Onyx
Silicon dioxide (SiO2) with parallel banded structure
Mineral (variety of chalcedony)
Lapis Lazuli (Simulated)
Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite, Ca2Al(AlSi3O10)(OH)2
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sandstone (specifically Arkose or Ferruginous Sandstone)
Sandstone (SiO2 with iron oxide inclusions)
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Pyrulite (Pyrite / Chalcopyrite)
Iron Sulfide (FeS2) or Copper Iron Sulfide (CuFeS2)
mineral
The user-provided image does not contain a rock or mineral specimen
N/A
Ferruginous Quartzite (Red Sandstone/Quartzite)
Quartzite with Iron inclusions (SiO2 + Fe2O3)
metamorphic
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Milky Quartz (Tumbled/Water-worn)
Silicon Dioxide (SiO2)
mineral
Pink Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Nuummite
Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Schist
Mica Schist
metamorphic
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Obsidian
Obsidian (Volcanic Glass) SiO2 (70% or more)
igneous
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
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
Banded Sandstone (Differential Weathering)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral