Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Metamorphic Or Sedimentary Depending On Local Grade
Browse metamorphic or sedimentary depending on local grade specimens identified by the Rock Identifier community.
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Peacock Ore (Bornite or Iridescent Chalcopyrite)
Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with tarnish
mineral
Black Obsidian and Hematite
Volcanic Glass (SiO2) and Hematite (Fe2O3)
igneous and mineral
Red Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Fossiliferous Rock (likely Dinosaur Fossil in Matrix)
Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)
sedimentary
Hag Stone
Perforated Chert (Microcrystalline Silica, SiO2)
sedimentary
Fossilized Coral (Petoskey Stone or similar Hexagonaria variant)
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Banded Calcite (often sold as Mexican Onyx or Aragonite)
Calcite/Aragonite (Calcium Carbonate, CaCO3)
sedimentary
Hematite
Hematite (Fe2O3)
Mineral
Quartzite
Quartzite (SiO2)
metamorphic
Nephrite Jade
Tremolite-Actinolite solid solution series (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Lapis Lazuli Globe
Complex mixture of Lazurite ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2), Calcite, and Pyrite
metamorphic
Quartzite (Milky)
Quartzite (SiO2)
metamorphic
Sapphire
Corundum (Al2O3)
mineral
Almandine Garnet & Tumbled Citrine Quartz
Fe3Al2(SiO4)3 (Garnet) and SiO2 (Quartz)
mineral
Moonstone (Blue Flash)
Potassium Aluminum Silicate (KAlSi3O8), a variety of Orthoclase Feldspar
mineral
Amethyst and Ruby in Zoisite
Silicon Dioxide (SiO2) and Anyolite (Zoisite-Hornblende-Ruby mix)
mineral and metamorphic rock
Serpentinite
Serpentinite ((Mg,Fe,Ni,Al)3Si2O5(OH)4)
metamorphic
River Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Smoky Quartz in Matrix
Silicon dioxide (SiO2) within Pegmatite/Gneiss
igneous
Sandstone (Fossiliferous)
Arenite / Clastic Sedimentary Rock
sedimentary
Chert (Yellow Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Sandstone (Ironstone)
Iron-rich Arenite
sedimentary
Black Opal
Hydrated Silica (SiO2·nH2O)
mineral
Jade (likely Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
![Turquoise (Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]) — mineral](https://media.rockidentification.com/98a2a2f8-be01-4831-a944-de6fd3830399-thumbnail.jpg)
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Blue Sapphire
Corundum (Al2O3)
mineral
Shale
Argillite / Shale
sedimentary
Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Tiger's Eye
Tiger's Eye (a variety of Chalcedony, which is a microcrystalline quartz with fibrous inclusions of oxidized crocidolite)
Mineral
Sapphire (Corundum variety)
Sapphire (Al₂O₃)
Mineral
Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Mineral
Siltstone
Siltstone (primarily composed of quartz and clay minerals)
sedimentary
Chalcopyrite in Quartz (Gold Ore Matrix)
CuFeS2 (Chalcopyrite) with SiO2 (Quartz)
mineral
Pyrite Concretion
Iron Sulfide (FeS2) in Sedimentary Matrix
sedimentary
Mixed Mineral Collection (with Quartz, Beryl, and host rock)
Silicon Dioxide (Quartz), Be3Al2Si6O18 (Beryl), and associated Schist/Pegmatite
mineral