Limestone with Stylolites
Calcareous sedimentary rock (CaCO3)
sedimentary
Category
Sedimentary Or Igneous Fragment
Browse sedimentary or igneous fragment specimens identified by the Rock Identifier community.
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Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz-rich metamorphic fragment (likely mica schist)
Mica schist, probably muscovite–quartz schist
metamorphic
Quartz Geode Fragment
Silicon Dioxide (SiO2) in a Sedimentary Host
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (specifically a fragment with Desert Varnish)
Microcrystalline quartz (SiO2)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz-rich pegmatite with mica and dark inclusions
Pegmatite; chiefly quartz (SiO₂), with feldspar and biotite/tourmaline inclusions
igneous
Fossiliferous Limestone with Fossil Fragment
Fossiliferous Limestone (CaCO3 with organic remains)
fossil
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Chert (and Limestone)
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3)
sedimentary
Fossilized Wood (with Coal and Limonite)
Petrified Wood (Silicified or Carbonized Flora)
sedimentary
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Fossil bivalve shell
Fossilized or partially mineralized bivalve; exact genus cannot be determined from the image
fossil
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Fossiliferous Sandstone / Fossil Fragment
Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material
fossil
Quartz / Quartzite Fragment
Silicon Dioxide (SiO2)
igneous, sedimentary, or metamorphic (mineral-based)
Fossilized Trilobite or Mollusk Fragment
Phylum Arthropoda / Mollusca fossil in sedimentary matrix
fossil
Chert (Nodule / Geode fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Brachiopod Shell Fragment
Brachiopoda (Class: Rhynchonellata or Strophomenata)
fossil
Basalt Pebble
Extrusive Igneous Rock
igneous
Breccia Pebble
Sedimentary Breccia
sedimentary
Flint or chert flake
Microcrystalline quartz (SiO₂), commonly chert/flint
sedimentary
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Crinoid Fossil Fragment
Crinoidea (echinoderm fossil embedded in limestone/matrix)
fossil
Amethyst Geode Fragment
Amethyst (Silicon Dioxide, SiO2) with Quartz matrix
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Likely tumbled amber or orange chalcedony
Uncertain from image; possibly amber (fossilized resin, chiefly C10H16O) or carnelian (microcrystalline quartz, SiO₂)
gemstone
Honey calcite (likely)
Calcite — calcium carbonate, CaCO₃
mineral
Iron-rich chert or jasper
Microcrystalline quartz (SiO₂), colored by hematite/goethite inclusions
sedimentary
Banded Agate (specifically Crazy Lace Agate style)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Flint variety)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone (lithic wacke/conglomerate mix)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Fossilized Shark Tooth (Fragment) in Matrix
Elasmobranchii (subclass)
fossil
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Weathered pegmatite or feldspar-rich granite fragment
Granitic pegmatite, composed mainly of potassium feldspar and quartz, with minor mica; exact identification is uncertain from the photograph
igneous
Breccia
Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)
sedimentary
Botryoidal Chalcedony (Geode fragment)
Silicon Dioxide (SiO2)
mineral
Milky quartz with iron-oxide staining
Quartz (silicon dioxide, SiO₂)
mineral
Red jasper fragment
Jasper, microcrystalline quartz (SiO₂) colored chiefly by iron oxides
mineral
Weathered banded iron formation (iron-rich quartzite)
Banded iron formation (BIF), chiefly hematite/magnetite and microcrystalline quartz (SiO₂)
sedimentary