Hematite
Iron(III) oxide (Fe2O3)
Mineral
Category
Not A Natural Rock (Man Made Composite)
Browse not a natural rock (man made composite) specimens identified by the Rock Identifier community.
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Moonstone (Feldspar)
Orthoclase/Albite ((K,Na)AlSi3O8)
mineral
Obsidian / Volcanic Glass
Obsidian (principally SiO2, usually 70% or more)
igneous
Banded Agate (specifically Moss or River Agate variety)
Cryptocrystalline Quartz (SiO2)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
mineral
Green Aventurine
Aventurine (a variety of Quartz, SiO2)
Mineral
Not a rock
Not a rock
Not a rock
Ironstone Nodule (Ironstone Concretion)
Siderite-rich Mudstone (FeCO3) or Limonite (FeO(OH)·nH2O)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Granite
Granite
igneous
Ferruginous Sandstone (with Iron Oxide staining)
Clastic Sedimentary Rock - Quartz Arenite/Wacke
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)
sedimentary
Limestone (specifically Chalky Limestone)
Calcium Carbonate (CaCO3 / Calcite)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
mineral
Rhodochrosite (Beads) and Citrine (Pendant)
Rhodochrosite (MnCO3) and Quartz variety Citrine (SiO2)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende, chlorite, or manganese/iron oxides
mineral
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn,Fe,Mg,Ca)SiO3
Mineral
Magnetite (likely in Hematite or Ironstone)
Magnetite (Fe3O4)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Iron Oxide)
sedimentary
Clear Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Kambaba Jasper (Crocodile Jasper)
Stromatolitic Rhyolite/Jasper (SiO2)
sedimentary
Dalmatian Stone
Dalmatian Stone (a peralkaline igneous rock consisting of Feldspar, Quartz, and Arfvedsonite)
igneous
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Banded Agate (specifically Botryoidal/Orbicular Agate)
Silicon Dioxide (SiO2)
Mineral (variety of Chalcedony/Quartz)
Tree Agate (or Moss Agate), faceted into a crystal tower
Dendritic Agate (Silicon Dioxide, SiO2)
Mineral
Corundum (Sapphire/Ruby in Matrix)
Aluminium oxide (Al2O3)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral