Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Category
Sedimentary Rock
Browse sedimentary rock specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock in the encyclopedia
View all →
Brick
Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)
Man-made material (constructed)
Marble
Metamorphosed Limestone/Dolomite
metamorphic
Chert (Jasper or Flint variant)
Chert (composed of microcrystalline quartz, SiO2)
sedimentary
Red Jasper (with Quartz Veins)
Jasper (var. chert, SiO₂)
Sedimentary Rock (technically chert, a microcrystalline quartz)
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Pebble (likely Quartzite or Chert)
Clastic Sediment, potentially composed of SiO₂ (Quartz)
Mineral, Sediment
Laterite
Laterite (primarily composed of hydrated oxides of iron and aluminum)
Sedimentary Rock (as a residual soil/rock, it's often considered a type of sedimentary rock due to its formation from weathering, though it can cross into soil science)
Amethyst and Limestone
Amethyst (SiO2 - Silicon Dioxide) and Limestone (CaCO3 - Calcium Carbonate)
The purple specimen is a mineral (Amethyst); the white specimen is a sedimentary rock (Limestone or Marble).
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Quartz Geode with Calcite
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Sandstone with Desert Varnish
Arenite (SiO2 predominantly) with Ferromanganese coating
sedimentary
Orange Quartz (or Carnelian Chalcedony)
Silicon Dioxide (SiO2)
mineral
Painted River Rock
Painted Quartzite or Smooth Siltstone
sedimentary
Sandstone Cobble
Clastic Sedimentary (Sandstone)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Sandstone
Arenite (primarily quartz with iron oxide cement)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Gossan (with Limonite/Hematite coating)
Ferruginous Gossan (Fe2O3·nH2O / Fe2O3)
sedimentary
Veined Limestone (Micrite) with Quartz/Calcite Veins
Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions
sedimentary
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Sandstone with Quartz Vein
Arenite with Crystalline Silica (SiO2)
sedimentary
Banded Slate
Slate (Metamorphosed Siltstone/Mudstone)
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Coal (Bituminous)
Sedimentary carbonaceous rock
sedimentary
Garnet Schist
Garnetiferous Micaceous Schist
metamorphic
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Yellow Jasper with Hematite
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Chert (Jasper/Flint Pebble)
Microcrystalline quartz (SiO2)
sedimentary
Dalmation Jasper (or Dalmation Stone)
Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)
igneous
Sandstone
Arenite (predominantly SiO2 with iron oxides)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Polymictic Conglomerate
sedimentary