Mineral (Impactite)

Fossilized bone fragment (probable mammalian tooth or bone)

Mineralized bone, commonly hydroxyapatite [Ca5(PO4)3(OH)] replaced or impregnated by silica/calcite

Fossilized Shark Tooth

Chondrichthyes (Class)

Gneiss

Gneiss

Likely biotite-rich schist

Mica schist, likely containing biotite and quartz; exact identification requires examination

Tumbled quartz or calcite specimen

Quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Greenstone / Metabasalt

Chlorite schist or Epidiorite

Greenstone

Protolith: Basaltic rock

Greenstone

Greenschist / Meta-basalt

Agate / Chalcedony Geode

Silicon Dioxide (SiO2)

Limonite Boxwork / Iron Ore Concretion

FeO(OH)qnH2O (Hydrated iron oxide)

Botryoidal Goethite

Goethite (α-Fe3+O(OH))

Weathered serpentinized ultramafic rock

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

Quartz (Druzy or Chalcedony variant)

Silicon Dioxide (SiO2)

Potassium Feldspar (Orthoclase / Microcline)

KAlSi3O8 (Potassium Aluminum Silicate)

Tumbled green stone, likely serpentine

Serpentine-group minerals, commonly antigorite or lizardite; approximate formula Mg₃Si₂O₅(OH)₄

Weathered, quartz-rich metamorphic rock (likely schist or gneiss)

Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining

Chrysocolla-bearing rock (likely chrysocolla in a host rock)

Chrysocolla, hydrated copper aluminosilicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O

Metamorphosed mafic rock, likely amphibolite

Amphibolite, chiefly hornblende + plagioclase; possibly mafic gneiss or altered basalt

Granite

Intrusive Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)

Small dark mineral fragment

Undetermined; image lacks diagnostic detail for reliable identification

Limonite / Goethite (Ironstone Nodule)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Likely quartz-rich mineral specimen

Quartz (SiO₂), possibly milky quartz or quartz-bearing rock

Tumbled greenstone (likely serpentine or nephrite-like material)

Serpentinite, chiefly serpentine-group minerals; exact identification requires testing

Green Fluorite

Calcium fluoride (CaF2)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Fluorite with Quartz coating

Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

Fluorite

Calcium fluoride, CaF2

Quartz with Pyrite

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Likely a small rough mineral specimen

Unidentifiable from the image; possibly a mica-bearing rock or green mineral

Polished granite slab

Granite, a coarse-grained quartz–feldspar plutonic rock

Fossilized tooth, likely mammoth or mastodon molar fragment

Proboscidean molar enamel and dentin; Mammuthus or Mammut sp. (tentative)

Gneiss with Quartz Veining

Gneiss (High-grade metamorphic rock)

Gneiss

Gneiss

Granite Gneiss

Gneiss (Derived from Granite protolith)

Granite Pebbles

Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)

Nickel coin (U.S. currency)

Cupronickel (75% Copper, 25% Nickel alloy)

Gemstone Ring

Various (Likely Glass, Cubic Zirconia, or assorted semi-precious stones)

Amethyst beads

Amethyst, purple quartz (SiO₂)

Mixed Mineral Assortment (Pyrite, Kyanite, Agate, Jasper)

FeS2 (Pyrite), Al2SiO5 (Kyanite), SiO2 (Agate/Jasper)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Weathered iron-rich metamorphic rock, possibly schist or metabasalt

Provisional identification: chlorite–quartz–feldspar schist or altered basalt; exact mineralogy requires testing

Rounded, banded metamorphic cobble

Likely gneiss or foliated quartz-rich metamorphic rock; exact identification is uncertain from the photograph.