Ironstone Concretion (Nutstone)
Ironstone (with High Limonite/Hematite Content)
sedimentary
Category
Not A Rock
Browse not a rock specimens identified by the Rock Identifier community.
Dyed Agate Geode (Pink/Magenta)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
Yellow Quartzite or Yellow Jasper
Quartzite (primarily SiO2 with Iron oxide staining)
metamorphic
Milky Quartz with Chlorite/Mica inclusions
Silicon Dioxide (SiO2) with inclusions
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (Fe2O3 stained)
sedimentary
Dendritic Jasper
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
sedimentary
Jasper with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
sedimentary
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Granitoid (Granite/Diorite)
Course-grained Plutonic Igneous Rock
igneous
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
Mineral
Granite Cobble
Felsic Intrusive Igneous Rock (Granite)
igneous
Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Leopard Skin Jasper
Jasper (Silicon Dioxide with impurities), SiO2
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Sandstone
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Jasper or Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Jasper with Quartz inclusions
Silicon Dioxide (SiO2)
sedimentary
Carnelian Agate (with Quartz/Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Vesicular Basalt
Aphanitic Mafic Igneous Rock (with Vesicular Texture)
igneous
Basalt (Polished River Stone)
Aphanitic Mafic Igneous Rock
igneous
Orca Agate (Blue Chalcedony)
Silicon Dioxide (SiO2)
mineral
Granite Cobble
Granite (Phaneritic Igneous Rock)
igneous
Granite
Phaneritic Igneous Rock (Granitic)
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace titanium, iron, or manganese
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
African Turquoise (Jasper)
Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)
Rock
Chert (or Flint)
Chert (cryptocrystalline quartz), SiO2
Sedimentary
Serpentine (Lizardite)
Serpentine subgroup, Mg3Si2O5(OH)4
metamorphic
Basalt River Cobble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Schist with Schorl (Black Tourmaline)
NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Conglomerate (or Breccia)
Clastic Sedimentary Rock (Conglomeratic)
sedimentary
Basalt
Basalt (Mafic Volcanic Rock)
igneous