Coquina / Shelly Limestone
Bioclastic Limestone (composed of CaCO3)
sedimentary
Category
Anthropogenic (Man Made Artifact)
Browse anthropogenic (man made artifact) specimens identified by the Rock Identifier community.
Rough Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Coprolite
Coprolite
sedimentary
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Banded Iron Formation
Banded Iron Formation (BIF)
Sedimentary Rock
Quartz-veined Siltstone
Siltstone with Quartz (SiO2) veins
sedimentary
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Schist with Biotite and Quartz
Biotite-Quartz Schist (Fe,Mg,Al silicate mix)
metamorphic
Sandstone Geode (Unbroken)
Siliciclastic sedimentary rock (primarily Quartz)
sedimentary
Quartz Druzy Geode
Silicon Dioxide (SiO2) - Crystalline Variety
mineral
Basalt River Pebble
Basalt
igneous
Orca Agate (Chalcedony)
Silicon Dioxide (SiO2) with inclusions
mineral
Pink Granite
Granite (Alkali-feldspar granite)
igneous
Limonite (Iron Ore)
Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)
Mineral
N/A (This is a digital image of a bar graph)
Digital Data Visualization (Bar Chart)
This is not a rock or mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Milk Quartz (Common White Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Quartzite
Quartzite (SiO2)
Metamorphic
Mahogany Obsidian
Volcanic glass containing Hematite or Magnetite (SiO2 + Fe2O3)
igneous
Ambergris
Ambrein (C30H52O)
mineraloid / organic geological substance
Granite
Phaneritic Felsic Igneous Rock
igneous
Quartz (possibly milky quartz)
Quartz (Silica; SiO₂)
Mineral
Gneiss (likely)
Gneiss
Metamorphic
Serpentine
Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)
Metamorphic rock
Chert (Flint)
Chert (microcrystalline quartz)
sedimentary
Chert (or Flint)
Silicon dioxide (SiO2)
sedimentary
Stromatolite
Laminated biogenic sedimentary structure (formed by Cyanobacteria)
sedimentary
Schorl (Black Tourmaline) in Quartz or Feldspar Matrix
NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl) in Granitic Pegmatite
igneous
Druzy Quartz on Matrix (likely Limestone or Sandstone)
Silicon Dioxide (SiO2) with various trace impurities
Mineral on Sedimentary Rock
Basalt
Mafic volcanic rock (Silicon dioxide 45-52%)
igneous
Obsidian (Apache Tear)
Obsidian / Amorphous Volcanic Glass (main component: SiO2)
igneous
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Granite (weathered)
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Limonitic Sandstone with Inclusion
Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Queen Conch Shell (Biogenic Calcium Carbonate)
Aliger gigas (synonym Strombus gigas); Composition: Aragonite (CaCO3)
mineral
Quartz (beads)
SiO2 (Silicon Dioxide)
Mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral