Slickenside in Limestone
Tectonized Limestone / Calcite (CaCO3)
metamorphic (localized) or sedimentary
Category
Metamorphic (Localized) Or Sedimentary
Browse metamorphic (localized) or sedimentary specimens identified by the Rock Identifier community.
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Tumbled purple stone, likely charoite
Charoite, a complex potassium-calcium silicate mineral (commonly approximated as (K,Sr,Ba,Mn)₁₅–₁₆(Ca,Na)₃₂Si₇₀O₁₈₀(OH,F)₄·nH₂O)
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Concretion
Sedimentary Concretion
sedimentary
Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
Mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Green Jasper (Chert)
Microcrystalline Quartz (SiO2) with iron/clay inclusion
sedimentary
Purple Conglomerate
Polymictic Conglomerate
sedimentary
Chert Nodule or Concretion
Microcrystalline Quartz / Sedimentary Nodule
sedimentary
Quartz with Iron Oxide Stain
Silicon Dioxide (SiO2) with Hematite/Limonite coatings
mineral
Weathered granite or granitic gneiss
Granite; primarily quartz, feldspar, and mica, with possible iron-oxide weathering
igneous
Sandstone with Fossil Leaf Impression
Sedimentary rock (Sandstone/Siltstone matrix) with Carbonaceous film fossil
fossil
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Mookaite Jasper
Radiolarite (SiO2)
sedimentary
Ironstone (Limonitic/Hematitic Sandstone)
Ferruginous sandstone (predominantly Fe2O3 and FeO(OH))
sedimentary
Leopardite
Quartz porphyry / Quartz monzonite with manganese oxide spots
igneous
Sandstone with Iron Oxide Concretion
Arenite with Hematite/Goethite Concretion
sedimentary
Greenschist (Chlorite Schist)
Greenschist (containing Chlorite, Actinolite, and Epidote)
metamorphic
Bumble Bee Jasper
Calcite and Volcanic Ash Mixture
sedimentary
Orange Sapphire
Corundum (Al2O3 with trace elements)
gemstone
Stichtite in Serpentine (Atlantasite)
Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4
metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Chert (Field-collected variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Leopard Skin Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Banded Calcite (often marketed as Mexican Onyx or Onyx Marble)
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Greenschist
Greenschist facies rock (containing chlorite, actinolite, and epidote)
metamorphic
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Lapis Lazuli (Low Grade)
Lapis Lazuli (Metamorphic rock containing lazurite, calcite, and pyrite)
metamorphic
Pitted Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone Pebble with Iron Staining
Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)
sedimentary
Pitted Sedimentary Rock / Cupstone
Sedimentary rock with weathering pit (arenite / sandstone)
sedimentary
Serpentinite (with Pyrite/Garnet inclusions)
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4
metamorphic
Chert (Flint) with Patina
Microcrystalline Quartz (SiO2)
sedimentary
Hag Stone
Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)
sedimentary
Limonite (Ironstone Concretion)
Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)
sedimentary
Pink Tumbled Quartz (Dyed)
Silicon Dioxide (SiO2)
mineral
Chert (often called Flint when found in chalk/limestone)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Chert (specifically Tan Chert)
Chert (SiO2)
sedimentary
Leopard Skin Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (concretionary/nodular variant)
Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions
sedimentary
Quartz crystal cluster (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral