Sedimentary Or Mineral

Pyrite

Iron Sulfide (FeS2)

Sedimentary Rock Fragments

Clastic Sedimentary Rock

Shale

Argillaceous sedimentary rock

Gastropod Fossil

Gastropoda

Sandstone

Clastic Sedimentary Rock

Pyrite

Iron sulfide (FeS2)

White Howlite

Howlite (Ca2B5SiO9(OH)5)

Banded gneiss pebble

Gneiss, likely quartz–feldspar–biotite gneiss

Shale and Pebble Fragment

Sedimentary Rock (Mudstone/Shale with Silica Pebble)

Magnetite (Iron Ore)

Iron(II,III) oxide (Fe3O4)

Veined Sandstone with Calcite Veins

Sedimentary sandstone with hydrothermal/mineral veins

Limonite

FeO(OH)·nH2O

Limonite

FeO(OH)•nH2O

Sandstone

Arenite (primarily SiO2)

Weathered banded gneiss

Foliated quartz–feldspar-rich gneiss; exact mineral identification requires closer examination

Iron-rich slate or phyllite

Fine-grained, foliated metamorphic rock, likely iron-oxide-stained slate/phyllite; exact identification requires examination

Banded gneiss

Foliated gneiss, likely quartz–feldspar–mica gneiss

Banded gneiss

Quartz–feldspar gneiss, possibly biotite-bearing; exact identification requires testing

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Boji Stone

Polished iron pyrite and marcasite concretions

Banded Sedimentary Rock

Siliciclastic Sedimentary Rock

Banded Sedimentary Rock

Siliciclastic sedimentary rock

Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

Limonite

FeO(OH)•nH2O

Red Sandstone

Sedimentary Arenite

Concretion

Sedimentary Concretion

Sedimentary Rock (Limestone or Siltstone pebble)

Sedimentary rock fragment

Limonite Geode (Ironstone Concretion)

Limonite [FeO(OH)·nH2O] with possible Quartz or Calcite interior

Sandstone with Quartz/Calcite druse

Arenite with druse (SiO2 or CaCO3)

Limonite

FeO(OH)•nH2O

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Possible fossilized bone fragment

Indeterminate vertebrate bone; no taxonomic identification is possible from the image alone

Sandstone pebble

Sandstone (mainly Quartz, SiO2)

Shale

Shale (clastic sedimentary rock)

Fossil-bearing Sedimentary Rock

Sedimentum cum fossili

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)

Sedimentary Rock

Sedimentary rock (lithified sediment)

Blue Apatite

Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Sandstone

Arenite

Sandstone

Clastic sedimentary rock

Limonite / Ironstone

Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O