Man Made Composite (Lithified Equivalent Of Sedimentary)

Breccia

Breccia (Clastic Sedimentary Rock)

Blue glassy cabochon, likely blue quartz or synthetic glass

Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive

Sandstone

Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)

Sandstone

Arenite (specifically sublithic or quartz arenite)

White coral limestone (probable fossiliferous limestone)

Calcite (CaCO₃), commonly derived from aragonitic coral skeletons recrystallized to calcite

Fossiliferous limestone

Bioclastic limestone, primarily calcite (CaCO₃)

Chert (White Chert/Flint)

Microcrystalline Quartz (SiO2)

River-worn sandstone cobble

Quartz-rich sandstone (arenite), likely ferruginous sandstone

Puddingstone

Conglomerate

Rounded brown pebble, likely chert or iron-stained quartzite

Chert (microcrystalline quartz, SiO₂) or quartzite (recrystallized quartz, SiO₂)

Red Jasper

Microcrystalline Quartz (SiO2)

Fossilized Brachiopod/Bivalve in Limestone

Brachiopoda or Bivalvia fossil in Calcite/Limestone (CaCO3)

Sandstone (Quartz Arenite)

Sandstone (dominated by SiO2 quartz grains)

Unidentified gray stone/concrete-like fragment

Indeterminate; likely a fine-grained carbonate or cementitious geological fragment

Concrete or asphalt-like aggregate surface with a dark fragment

Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock

Limpets Shell / Fossil Specimen

Patellogastropoda (Class)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2 with minor Fe2O3)

Weathered iron-stained quartzite or chert nodule

Siliceous rock composed chiefly of microcrystalline quartz (SiO₂), with iron-oxide staining and possible clay/minor carbonate minerals

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Sandstone

Arenite (lithic or quartz sandstone)

Polished/tumbled brown-and-white mineral fragment

Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral

Sandstone with Trace Fossils

Quartz Arenite with Bioturbation (Trace Fossils)

Weathered limestone fragment, possibly fossiliferous

Calcite-rich limestone (CaCO₃); exact identification is uncertain from one image

Weathered limestone or concrete-like calcareous rock

Limestone; predominantly calcite (CaCO₃), possibly containing dolomite and silicate impurities

Iron-stained chert or jasper pebble

Microcrystalline quartz (SiO₂), likely hematite/goethite-bearing

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate

Clastic sedimentary rock (Puddingstone)

Likely weathered limestone or calcitic marble

Calcite-rich carbonate rock; chiefly calcium carbonate, CaCO₃

Banded iron formation fragment

BIF: microcrystalline quartz (chert/jasper) with iron oxides and/or magnetite

Carved limestone architectural fragment

Limestone, predominantly calcite (CaCO₃), possibly weathered fossiliferous or oolitic limestone

Weathered sandstone or iron-rich sedimentary cobble

Quartz-rich sandstone, possibly ferruginous sandstone

Iron-rich sandstone or weathered ironstone pebble

Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides/hydroxides such as hematite (Fe₂O₃) and goethite (FeO(OH))

Iron-rich claystone or laterite fragment

Ferruginous claystone; predominantly clay minerals with iron oxides/hydroxides (hematite/goethite)

Polished fossiliferous limestone pebble

Fossiliferous micritic limestone, probably containing gastropod or bivalve fragments

Fossiliferous limestone

Bioclastic limestone, predominantly calcite (CaCO₃)

Jasper / Quartz Pebble

Silicon Dioxide (SiO2) with microcrystalline impurities

Layered shale and sandstone gorge

Shale and thin-bedded sandstone, likely Devonian or older sedimentary strata

Banded chert or siliceous mudstone

Microcrystalline quartz (chalcedony), SiO₂; possibly ferruginous shale

Fossil Coral (Rugose Coral)

Rugosa (extinct order of solitary and colonial corals)

Sandstone Concretion

Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)

Crinoid Fossil Marble

Crinoidal Limestone / Phylum Echinodermata