Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Black Limestone with Calcite Veins
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Granite (River Pebble)
Phaneritic intrusive igneous rock (Felsic)
igneous
Riverstone (Quartzite or Siltstone cobble)
Quartzite (primarily SiO2)
metamorphic
Quartz with Orthoclase Feldspar
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
mineral
Amethyst (Tumbled)
Amethyst (SiO2 with iron impurities)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Schist with Schorl (Black Tourmaline)
NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)
metamorphic
Fossil coral fragment
Likely calcitic colonial coral, possibly fossilized scleractinian coral
fossil
Granite fragment
Phaneritic Igneous Rock (Granitic composition)
igneous
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2)
mineral
Likely galena-bearing ore specimen
Galena (PbS), possibly with quartz or calcite gangue
mineral
Tiger's Eye (with Hematite/Magnetite matrix)
Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH/Fe2O3)
metamorphic
Fossiliferous Limestone (Coral Fossil)
Scleractinian Coral in Calcium Carbonate (CaCO3)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Weathered sandstone
Quartz-rich clastic sandstone, commonly arkosic or feldspathic
sedimentary
Calcite (likely chalky calcite fragment)
Calcite, calcium carbonate (CaCO₃)
mineral
Dalmatian Stone (commonly Dyed)
Dalmatian Jasper (Peralkaline igneous rock)
igneous
Quartz pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst (Tumbled Quarz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Granite Cobble
Granite
igneous
Yellow Quartz (Chalcedony/Citrine Pebble)
Silicon Dioxide (SiO2)
mineral
Pyrite in Quartz Matrix
Iron Disulfide (FeS2) in Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper/Flint variety)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Citrine
Silicon Dioxide (SiO2)
mineral
Banded Agate
Cryptocrystalline Silica (SiO2)
mineral
Agate (Banded Chalcedony)
Cryptocrystalline Silica (SiO2)
mineral
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Polished agate/jasper nodule
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide impurities
mineral
Fulgurite
Lechatelierite (Silica glass), typically SiO2
mineraloid
Polished pink feldspar or quartz pebble (uncertain)
Likely microcline feldspar (KAlSi₃O₈) or quartz (SiO₂), with iron-oxide inclusions
mineral
Milky quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Light-colored weathered stone, possibly limestone or quartz-rich rock
Indeterminate; likely calcitic limestone (mostly CaCO₃) or quartz sandstone (SiO₂)
sedimentary
Milky quartz-rich rock
Quartz (SiO₂), likely massive milky quartz with minor iron-oxide staining and attached host material
mineral
Pink quartz (likely rose quartz)
Quartz, silicon dioxide (SiO₂), commonly rose quartz colored by trace impurities and microscopic inclusions
mineral
Quartz-rich feldspathic rock, likely granite or granitic gneiss
Granite/granitic gneiss; chiefly quartz (SiO₂), feldspar, and minor mica
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (Mostly SiO2)
metamorphic
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Agate
SiO2 (Silicon dioxide, chalcedony variety)
Mineral
Chert / Flint
Cryptocrystalline Quartz (Silicon Dioxide, SiO2)
sedimentary