Ferruginous Sandstone (Ironstone)
Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)
sedimentary
Category
Man Made Object (Metalwork)
Browse man made object (metalwork) specimens identified by the Rock Identifier community.
Blue Quartzite (Aventurine)
Quartzite (primarily SiO2) with inclusions of Dumortierite or Magnesio-riebeckite
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Aquamarine and clear quartz
Aquamarine (Be3Al2Si6O18), Quartz (SiO2)
Mineral
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2)
mineral
Blue Sapphire (faceted in jewelry)
Corundum (Al2O3)
mineral
Cockle Shell (Fossil or Recent)
Class Bivalvia, Family Cardiidae (e.g., Cerastoderma edule for common cockle)
Sedimentary (Biogenic, a type of fossil)
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Yellow Quartzite Pebble
Quartzite (primarily Silicon Dioxide - SiO2)
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Amazonite (or Amazon Stone)
Potassium Feldspar (Microcline), K(AlSi3O8)
mineral
White Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
White Agate (Chalcedony)
Agate (Silicon Dioxide - SiO2)
mineral
Feldspar Rich Granite with Limonite Staining
K-Feldspar Granite (KAlSi3O8)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Limestone
Calcareous Sedimentary Rock (CaCO3)
sedimentary
Clear Quartz (Rock Crystal)
Quartz (SiO₂)
Mineral
Serpentine
Serpentinite (complex of Mg, Fe, Ni, Al, Zn, Mn)Si2O5(OH)4
metamorphic
Red Garnet
Almandine and Pyrope (Silicate minerals: Fe3Al2(SiO4)3 and Mg3Al2(SiO4)3)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Petrified Wood
Silicified wood (Quartz, SiO2)
metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Kyanite
Kyanite (Al2SiO5)
Mineral
Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Sandstone Clast
Arenite (primarily SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2 with iron oxide cementation)
sedimentary
Marble
Metamorphosed Limestone (main mineral: Calcite, CaCO3)
metamorphic
Stromatolite
Biogenic Sedimentary Rock (Lithified microbial mat)
sedimentary
Kambaba Jasper
Stromatolite (Microbial mat fossil in silicified sediment)
sedimentary
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
Igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Banded Agate (specifically Chalcedony nodule)
Agate (Silicon Dioxide, SiO2)
mineral
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral