Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Category
Mineral (Man Made Composite)
Browse mineral (man made composite) specimens identified by the Rock Identifier community.
Mixed Gemstone Collection
SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)
mineral
Quartz with inclusions (likely Chlorite or Hornblende) and country rock
SiO2 (Quartz) with associated ferromagnesian minerals
Mineral/Igneous/Metamorphic association
Greenstone / Greenschist
Chlorite schist / Epidiorite
metamorphic
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Turquoise (Rough Specimens)
Hydrous phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Chrysocolla
Chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O
Mineral
Quartz with Mica (Micaceous Quartz)
Silicon Dioxide (SiO2) with Phyllosilicates
igneous/metamorphic
Hematite
Ferric oxide (Fe2O3)
mineral
Granite
Granite (High-silica plutonic rock)
igneous
Sandstone (Ferruginous)
Arenite (with Iron Oxides)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminum - CuAl6(PO4)4(OH)8·4H2O
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)
mineral
Limonitic Sandstone (Stained Sandstone)
Clastic Sedimentary Rock with Iron Oxide (Limonite/Goethite) staining
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Red Sandstone (Hematitic)
Clastic sedimentary rock (SiO2 with Fe2O3 inclusions)
sedimentary
Sandstone (Ferruginous)
Arenite (with Goethite/Limonite cement)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic intrusive igneous rock (approx. 70 percent SiO2)
igneous
Peridot
Olivine (specifically, the gem-quality variety forsterite, (Mg,Fe)2SiO4)
Mineral
Limonite Concretion
Goethite-rich Concretion (FeO(OH))
sedimentary
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Milky/Crystalline fragment)
Silicon Dioxide (SiO2)
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Schist
Mica Schist
metamorphic
Iron (Hematite variety)
Iron (Fe) / Hematite (Fe2O3)
mineral
Rutilated Quartz
Quartz (SiO2) with Rutile Inclusions (TiO2)
Mineral
Copper-bearing Quartz (with Malachite and Iron Oxides)
Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)
Mineral Specimen
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cementation)
sedimentary
Schist
Mica Schist
metamorphic
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Sapphire (Raw/Rough)
Corundum (Al2O3)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Emerald and Diamond (Jewelry Setting)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities) and Carbon (C)
mineral
Greenstone / Serpentinite
Serpentinite (composed primarily of minerals from the serpentine group Mg3Si2O5(OH)4)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, e.g., Antigorite, Lizardite, Chrysotile)
metamorphic
Sandstone Concretion
Septarian Concretion (Nodule)
sedimentary
Amethyst
Quartz variety; chemical formula: SiO₂ (silicon dioxide) with Fe³⁺ impurities
Mineral