Calamites
Calamites (Pith cast fossil)
sedimentary
Category
Mineral Composite
Browse mineral composite specimens identified by the Rock Identifier community.
Learn about Mineral Composite in the encyclopedia
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Pegmatite
Igneous Pegmatite (felsic intrusive rock)
igneous
Pearl
Nacre (Aragonite and Conchiolin), CaCO3
mineral
Sandstone (Red Sandstone / River Stone)
Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)
sedimentary
Beads (likely glass or man-made material)
N/A (artificial material)
Man-made material, not a natural rock or mineral specimen
Howlite
Howlite (Ca2B5SiO9(OH)5)
mineral
Quartz with Metallic Inclusion
Silicon Dioxide (SiO2) with associated metallic sulfide or oxide
mineral
Schist with Quartz Vein
Mica Schist with SiO2 vein
metamorphic
Amygdaloidal Basalt
Extrusive Igneous Rock with Secondary Mineral Fillings
igneous
Quartz Druzy on Matrix (with Copper Mineralization)
Silicon Dioxide (SiO2) with Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O)
mineral
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Satin Spar (Satin Spar Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Satin Spar Gypsum (Satin Spar Selenite)
Gypsum (Calcium Sulfate Dihydrate - CaSO4·2H2O)
mineral
Limonite Pseudomorph after Pyrite
Limonite (FeO(OH)·nH2O) replacing Pyrite (FeS2)
mineral
Dalmatian Jasper
Microcrystalline Quartz with Arfvedsonite and Tourmaline inclusions
igneous
Pyrite (on Quartz/Host Rock)
Iron Sulfide (FeS₂)
mineral
Polished malachite tower
Malachite, Cu₂CO₃(OH)₂ (basic copper carbonate)
mineral
Fossilized Shark Tooth
Elasmobranchii gen. indet.
fossil
Red Sandstone
Clastic Sandstone (typically Quartz-rich with Iron Oxide)
sedimentary
Fossil Shark Tooth
Carcharadon sp. (likely Carcharodon carcharias or similar Lamniformes)
fossil
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Banded Sandstone
Arenite (with iron oxide banding)
sedimentary
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Quartz (Milky or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Iron-rich or Arkosic)
Arenite (SiO2 with FeO(OH) or Fe2O3 staining)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Green Sandstone
Glauconitic Sandstone
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt containing Zeolite or Quartz (SiO2/Silicates)
igneous
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Gold in Quartz Ore
Hydrothermal Quartz with native Gold (Au)
mineral
Sandstone
Sandstone (Silicon dioxide, SiO2 based)
sedimentary
Polished ocean jasper / orbicular jasper
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions
mineral
Basalt with Amygdules
Amygdaloidal Basalt
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Moss-covered)
Silicon Dioxide (SiO2)
mineral
Jasper or Agate
Silicon dioxide (SiO2)
Mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, e.g., Lizardite, Chrysotile, Antigorite)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)
metamorphic