Howlite
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Category
Mineral, Often Found In Sedimentary Deposits
Browse mineral, often found in sedimentary deposits specimens identified by the Rock Identifier community.
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Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Celestine (or Celestite) on Matrix
Celestine (SrSO4)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Amethyst and Agate Geode Section
Silicon Dioxide (SiO2) - Crystalline Quartz and Chalcedony
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Jasper
Silicon dioxide (SiO2)
Mineral / Sedimentary
Satin Spar (Gypsum)
Hydrous calcium sulfate (CaSO4·2H2O)
mineral
Milky Quartz / Rose Quartz fragment
Silicon Dioxide (SiO2)
mineral
Yellow Quartz (Chert/Chalcedony)
Silicon Dioxide (SiO2) with iron inclusions
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Nodule)
Cryptocrystalline Quartz (SiO2)
sedimentary
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Fluorite on Matrix
Calcium Fluoride (CaF2)
mineral
Dendritic sandstone
Sandstone with Manganese Oxide dendrites
sedimentary
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Shale
Shale (Lutite)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Chalcedony (Agate / Moss Agate)
Silicon Dioxide (SiO2)
mineral
Barite
Barium Sulfate (BaSO4)
mineral
Blue Apatite
Apatite, Ca5(PO4)3(F,Cl,OH)
mineral
Hematite
Iron (III) oxide (Fe2O3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Rough Amber (likely Copal or immature Amber)
Organic gemstone / Succinite (if Baltic)
mineral
Agate Bookend / Quartz Geode
Silicon Dioxide (SiO2)
mineral
Agate
Silicon dioxide (SiO2)
mineral
Rhodochrosite
Rhodochrosite (MnCO3)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Limonite (Goethite/Ironstone)
Hydrated iron oxide-hydroxide, approximately FeO(OH)·nH2O
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Optical Calcite (Iceland Spar)
Calcium Carbonate (CaCO3)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Agate
Chalcedony SiO2
mineral
Agate
Silicon Dioxide (SiO2), microcrystalline variety of quartz
sedimentary
Marcasite Concretion (Propeller/Sand Dollar shape)
Marcasite (FeS2)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Iceland Spar (Optical Calcite)
Calcite (CaCO3)
mineral