Mineral Group

Sedimentary Strata of the Badlands (Mudstone, Siltstone, and Sandstone)

White River Group (Brule and Chadron Formations)

Serpentine Jade (New Jade/Olive Jade)

Serpentinite (a rock composed primarily of serpentine minerals) / Mg3Si2O5(OH)4 for Antigorite and Lizardite

Hypersthene

Hypersthene ((Mg,Fe)SiO₃)

Sunstone (Feldspar)

Oligoclase / Labradorite (Plagioclase Feldspar Group, (Na,Ca)Al1-2Si2-3O8)

Basalt

Extrusive igneous rock primarily composed of plagioclase and pyroxene

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, e.g., Antigorite, Lizardite, Chrysotile)

Greenstone / Serpentinite

Serpentinite (composed primarily of minerals from the serpentine group Mg3Si2O5(OH)4)

Greenish altered rock, possibly serpentinite or chlorite-rich schist

Tentative: serpentine-group minerals, chiefly antigorite/lizardite, or chlorite–actinolite assemblage

Serpentine (likely greenstone)

Serpentine-group minerals, chiefly antigorite, lizardite, and chrysotile; commonly with magnesite or magnetite

Polished black tourmaline (schorl)

Schorl, a tourmaline-group borosilicate: NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Green tourmaline (likely chrome/dravite tourmaline crystals)

Tourmaline-group cyclosilicate; commonly elbaite, dravite, or chromdravite, complex borosilicate formula

Red glassy gemstone, possibly garnet

Unidentified red transparent material; garnet group (X₃Y₂(SiO₄)₃) is a possibility

Weathered serpentinized ultramafic rock

Serpentinite; chiefly serpentine-group minerals, commonly with magnetite, brucite, talc, and relict olivine/pyroxene

Basalt

Mafic Volcanic Rock (composed mainly of Plagioclase, Pyroxene, and Olivine)

Gastropod Fossil (Snail Internal Cast)

Class Gastropoda (Steinkern)

Serpentine (serpentinite)

Serpentine-group minerals: mainly antigorite, lizardite, and/or chrysotile; commonly with magnetite and carbonate

Serpentinite (likely serpentinized ultramafic rock)

Serpentine-group minerals, chiefly antigorite/lizardite; commonly derived from peridotite

Small brown mineral fragment, possibly garnet

Unidentified; garnet is a tentative visual possibility (garnet-group silicates, X₃Y₂(SiO₄)₃)

Tumbled greenstone (likely serpentine or nephrite jade)

Serpentine-group mineral aggregate, or possibly nephrite (interlocking tremolite–actinolite amphibole)

Garnet (Polished)

Nesosilicate (Group formula: X3Y2(SiO4)3)

Iron Meteorite

Iron Meteorite (Group IAB or IIIAB common)

Chondrite Meteorite

Ordinary Chondrite (L or H group classification)

Granite

Phaneritic Acidic Igneous Rock (Granite Group)

Greenstone, likely serpentinite

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), possibly with magnetite and chlorite

Likely blue-gray slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Tumbled jasper (likely yellow/brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and clay inclusions

Tumbled serpentinite (likely)

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and carbonate

Slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Banded serpentine (likely antigorite-rich serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnesite/talc

Tumbled serpentine-rich rock

Serpentinite, likely antigorite/lizardite with magnetite and minor carbonates

Rounded green-gray pebble, likely serpentinite

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite

Likely greenish serpentine or soapstone fragment

Serpentine-group minerals, commonly antigorite/lizardite; possibly talc-rich steatite

Serpentinite

Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)

Yellow-green serpentine (likely serpentinite)

Serpentine-group minerals, chiefly antigorite/lizardite: Mg₃Si₂O₅(OH)₄

Basalt

Extrusive Igneous Rock

Basalt

Extrusive Igneous Rock

Greenstone / serpentinized ultramafic rock (probable)

Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with possible magnetite and talc

Tumbled pale-green stone, likely serpentine

Serpentine-group minerals, broadly (e.g., antigorite or lizardite); identification is uncertain from the image

Garnet-bearing Schist

Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist

Basalt

Extrusive Igneous Rock

Basalt

Extrusive Igneous Rock

Basalt

Basalt (principally composed of pyroxene and plagioclase feldspar)