Shale creek bed
Shale (fine-grained clastic sedimentary rock)
Sedimentary
Category
Sedimentary (Secondary Classification For A Weathered Mineral Specimen)
Browse sedimentary (secondary classification for a weathered mineral specimen) specimens identified by the Rock Identifier community.
Turquoise (Dyed Howlite or Magnesite imitation)
Hydrated phosphate of copper and aluminum / CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Sandstone (Greywacke/Lithic Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Lake Superior Agate
Silicon Dioxide (SiO2) - Variety Agate
mineral
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Quartz Geode (Druzy)
Crystalline Silicon Dioxide (SiO2)
mineral
Limestone (Weathered Aggregate)
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Weathered Volcanic Rock (possibly Rhyolite or Andesite Pebble)
Volcanic rock (e.g., Rhyolite or Andesite, specific identification would require thin section analysis or chemical assay). Mineral composition: Primarily feldspars (orthoclase and/or plagioclase), quartz (in rhyolite), micas, amphiboles, and sometimes pyroxenes.
Igneous, specifically volcanic/extrusive (possibly Rhyolite or Andesite)
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO₂)
mineral
Clear Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Turquoise and Red Coral
CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Corallium rubrum (Red Coral)
mineral
Chert (Iron-Stained)
Silicon Dioxide (SiO2)
sedimentary
Granite
Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)
igneous
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Sandstone (Quartzite-rich Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz, SiO2)
sedimentary
Sandstone (Greywacke)
Sandstone (SiO2 enriched with lithic fragments)
sedimentary
Sandstone
Sandstone (lithified arenite/wacke)
Sedimentary Rock
Ferruginous Sandstone Pebble
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH) staining)
sedimentary
Magnetite
Magnetite (Fe3O4)
Mineral
Sandstone Pebble
Arenite (primarily Quartz, SiO2)
sedimentary
Quartz (Smoky/Grey variety)
Silicon Dioxide (SiO2)
mineral
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Limonite (Oxidized Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Diamond
Diamond (pure carbon C)
mineral
Chrysocolla in Matrix
Chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Amber
Succinite
Mineraloid
Chert (Jasper focus)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz / Quartzite
Silicon Dioxide (SiO2)
Metamorphic or Mineral
Agate Geode with Quartz Druzy
Chalcedony (SiO2) and Quartz (SiO2)
mineral
Sandstone (Water-worn Cobble)
Arenite (SiO2 based)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Fossil Shark Tooth (Cretaceous white shark type)
Squalicorax (commonly known as Crow Shark)
Organic specimen (fossil)
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral