Man Made Composite (Lithified Equivalent Of Sedimentary)

Weathered sandstone

Quartz-rich sandstone (lithified arenite)

River Pebble

Lithified rock fragment (variable composition)

Brachiopod Fossil in Sedimentary Matrix

Phylum Brachiopoda in Siltstone/Mudstone matrix

Crinoid Fossil in Limestone

Crinoidea (Phylum Echinodermata) in Calcite Matrix (CaCO3)

Sandstone

Arenite (composed primarily of SiO2)

Conglomerate

Polymictic Conglomerate

Likely weathered gray limestone or shale fragment

Calcite-rich carbonate rock (limestone), possibly calcareous shale

Sandstone

Arenite (primarily Quartz Sandstone)

Limestone (specifically Fossiliferous Limestone)

Calcium Carbonate (CaCO3)

Iron-stained brecciated chert or jasper

Microcrystalline quartz (SiO₂), likely chert/jasper with iron-oxide staining

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite

Sandstone

Arenite (mostly SiO2)

Sandstone

Arenite (SiO2 primarily)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Weathered limestone or calcarenite fragment

Micritic limestone, likely calcite-dominated (CaCO₃)

Fossiliferous limestone, likely stromatolitic or bioclastic limestone

Calcite-rich carbonate rock; predominantly CaCO₃ (calcite), with possible siliciclastic impurities and fossil structures

Conglomerate (pebble conglomerate)

Clastic conglomerate; quartz- and feldspar-rich clasts in a dark, iron-stained matrix

Fossil-bearing limestone, possibly a crinoid or shell fragment

Calcite (CaCO₃) limestone containing an indeterminate marine fossil

Fossiliferous Limestone / Coral Fossil

Fossiliferous Limestone with Anthozoa (Coral) fossil

Fossiliferous conglomerate

Bioclastic, carbonate-cemented conglomerate (likely limestone matrix)

Gastropod Fossil (Snail Steinkern)

Class Gastropoda (internal mold)

Iron-rich sandstone or ferruginous conglomeratic sandstone

Ferruginous sandstone, primarily quartz (SiO₂) cemented or stained by iron oxides/hydroxides

Tan quartz-rich rock, likely sandstone or weathered quartzite

Quartz sandstone; primarily SiO₂ with possible feldspar and iron-oxide cement

Mixed polished gemstone and mineral collection

Primarily quartz varieties (SiO₂), plus probable aventurine, rose quartz, amethyst, agate, jasper, serpentine, feldspar, and possibly dyed or man-made glass pieces

Rounded quartz-rich sandstone or quartzite pebble

Likely lithic/quartz arenite; composition mainly quartz (SiO₂) with minor feldspar and iron-oxide staining

Weathered sandstone or iron-stained quartzite

Quartz-rich sandstone (SiO₂-dominated), possibly metamorphosed to quartzite

Weathered sandstone outcrop

Quartz-rich feldspathic sandstone, likely Pennsylvanian–Permian or younger depending on locality

Likely limestone or chalky carbonate rock

Calcite-rich limestone; predominantly calcium carbonate (CaCO₃)

Banded iron formation (ironstone), possibly jasper–hematite

Banded iron formation; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and silica (microcrystalline quartz/chert)

Chert (Red Jasper variant)

Silicon dioxide (SiO2)

Rounded brown river pebble

Likely weathered quartz-rich sandstone or iron-stained quartzite; exact identification requires testing

Tumbled brown stone, likely jasper or iron-rich chert

Microcrystalline quartz (SiO₂), possibly iron-oxide-bearing jasper/chert

Weathered iron-rich sandstone or ironstone

Ferruginous sandstone, likely limonite/goethite-cemented quartz arenite

Fossiliferous Limestone

Calcareous biomicrite / Bioclastic limestone

Limestone

Calcium Carbonate (CaCO3)

Crinoid Stem Fossil (in Chert or Limestone Matrix)

Crinoidea (Class) - Calcium Carbonate (CaCO3)

Favosites Fossil (Honeycomb Coral)

Favosites sp. (Extinct genus of tabulate coral)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)