Fluorite Octahedron
Calcium Fluoride (CaF2)
mineral
Category
Man Made
Browse man made specimens identified by the Rock Identifier community.
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Porphyritic Basalt
Basalt (with plagioclase phenocrysts)
igneous
Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Angel Wing Shell
Cyrtopleura costata
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Clear Quartz (or Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Eroded Limestone with Iron Staining
Carbonate Rock (CaCO3)
sedimentary
Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Vesicular Basalt
Basalt
igneous
Limestone with Lichen/Algae
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Mafic volcanic rock (Primary minerals: Plagioclase feldspar, Pyroxene)
igneous
Cockle Shell (Fossil or Recent)
Class Bivalvia, Family Cardiidae (e.g., Cerastoderma edule for common cockle)
Sedimentary (Biogenic, a type of fossil)
Talc
Talc (Mg₃Si₄O₁₀(OH)₂)
Mineral
Dyed Agate Slice
Silicon Dioxide (SiO2)
mineral
Granite Cobble
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Ferruginous Sandstone (Ironstone)
Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Blue Quartzite (Aventurine)
Quartzite (primarily SiO2) with inclusions of Dumortierite or Magnesio-riebeckite
metamorphic
Quartz (variety of colors)
SiO2 (Silicon Dioxide)
Mineral
Lepidolite (likely)
K(Li,Al)3(Al,Si)4O10(F,OH)2 (Phyllosilicate mineral, part of the mica group)
Mineral
Red Jasper
Red Jasper (variety of Chalcedony, SiO₂)
Mineral
Amethyst
Amethyst (SiO₂)
Mineral
Sandstone (Yellow/Tan)
Clastic sedimentary rock (primarily SiO2 with iron oxide staining)
sedimentary
Sandstone (Pebble/Cobble)
Arenite (primarily SiO2)
sedimentary
Clear Quartz (or Rock Crystal)
Quartz (SiO₂)
Mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO₂)
mineral
Quartz (Common Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Siltstone
Siltstone (primarily SiO2, Al2O3)
sedimentary
Basalt (Beach Pebble)
Extrusive mafic igneous rock
igneous
Blue Sapphire (faceted in jewelry)
Corundum (Al2O3)
mineral
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2)
mineral
Specular Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Scoria (Vesicular Basalt)
Scoria
igneous
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Lake Superior Agate
Cryptocrystalline Quartz (SiO2) with Iron impurities
mineral
Yellow Quartzite Pebble
Quartzite (primarily Silicon Dioxide - SiO2)
metamorphic