Lazulite
Lazulite (MgAl2(PO4)2(OH)2)
mineral
Category
Sedimentary Or Mineral
Browse sedimentary or mineral specimens identified by the Rock Identifier community.
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Celestite
Celestine (SrSO4)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
Mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Quartz Geode
Crystalline Quartz (Silicon Dioxide, SiO2)
mineral
Red Jasper or Ironstone concretion
SiO2 or Fe2O3
sedimentary or mineral
Gypsum Wallboard (Drywall)
Hydrous calcium sulfate (CaSO4·2H2O)
sedimentary (processed mineral product)
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Herkimer Diamond in Matrix
Quartz (SiO2) in Dolostone (CaMg(CO3)2)
sedimentary (host) / mineral (crystals)
Agate Geode
Chalcedony (SiO2 - Silicon Dioxide)
sedimentary (secondary mineral formation)
Jasper and Aquamarine (likely)
Jasper (Cryptocrystalline Quartz (SiO2)), Aquamarine (Beryl (Be3Al2Si6O18))
Sedimentary (Jasper), Mineral (Aquamarine)
Jasper in Basalt Matrix
Silicon Dioxide (SiO2) with impurities; Chalcedony
sedimentary (secondary mineral) within igneous
Iron-Stained Quartzite
Recrystallized Meta-Quartzite (primarily SiO2)
metamorphic
Sandstone (Picture Sandstone)
Arenite (primarily SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Sedimentary Sandstone with Iron Oxide
Ferruginous Sandstone
sedimentary
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Sedimentary rock
![Limonite Geode (Ironstone Concretion) (Limonite [FeO(OH)·nH2O] with possible Quartz or Calcite interior) — sedimentary](https://media.rock.id/23e3b366-c658-41d4-99f3-53fdaa23a555-thumbnail.jpg)
Limonite Geode (Ironstone Concretion)
Limonite [FeO(OH)·nH2O] with possible Quartz or Calcite interior
sedimentary
Brown Sandstone (River Rock)
Arenite
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone with Quartz/Calcite druse
Arenite with druse (SiO2 or CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Shale
Argillaceous sedimentary rock
sedimentary
Magnetite (Iron Ore)
Iron(II,III) oxide (Fe3O4)
mineral
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
General Rock and Mineral Collection (Center: Angelite / Blue Anhydrite)
Anhydrite (Calcium Sulfate, CaSO4)
Mineral
Limonite / Ironstone
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Sandstone
Arenite
sedimentary
Sandstone pebble
Sandstone (mainly Quartz, SiO2)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary