Mineral Description (Anthropogenic Material)

Greenstone

Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote

Blue-green turquoise-like tumbled stone

Turquoise, hydrous copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Schist (Greenschist / Mica Schist)

Foliated Metamorphic Rock (rich in chlorite, muscovite, and quartz)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Polished fluorite sphere

Fluorite (calcium fluoride, CaF₂)

Banded sandstone pebble

Lithic or quartz-rich sandstone; exact composition requires testing

Sandstone (Quartzose Sandstone)

Arenite (SiO2)

Serpentine (Serpentinite)

Serpentinite (complex silicate group including lizardite, chrysotile, and antigorite)

Fossilized Shark Tooth

Chondrichthyes (Class)

Likely fossilized shell or carbonate concretion

Indeterminate biogenic calcium carbonate, commonly calcite (CaCO₃)

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Sandstone with Iron Staining

Arenite (SiO2 with Fe-oxide coatings)

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Hematite/Limonite oxides)

Chert (with Quartz vein/coating)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite

Tumbled orange chalcedony and a gray stone disk

Chalcedony (microcrystalline quartz, SiO₂); disk likely fine-grained sandstone or slate

Red Sandstone

Arenite (SiO2 with Fe2O3)

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)

Sandstone

Arenite (primarily Quartz Sandstone)

Sandstone

Arenite (SiO2-rich)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

Arenite (with iron oxide cement, Fe2O3)

Granite (Pink/Potassium Feldspar Granite)

Felsic Plutonic Rock (Potassium Feldspar, Quartz, Mica, and Amphibole)

Green fluorite (likely polished/cut specimen)

Fluorite, calcium fluoride (CaF₂)

Petrified Wood

Silicified Wood (primarily SiO2)

Tumbled yellow chalcedony (likely citrine or yellow quartz)

Quartz, SiO₂; potentially microcrystalline chalcedony

Iron-stained quartz-rich rock, likely quartzite or silicified breccia

Quartz (SiO₂), possibly quartzite with limonite/goethite iron oxides

Rose quartz

Quartz, silicon dioxide (SiO₂), pink variety

Rounded river cobble, likely basaltic volcanic rock

Fine-grained mafic igneous rock; likely basalt or andesite

Fossilized Bone Fragment

Vertebrate Fossil Material (Apatite/Calcium Phosphate)

Tumbled brown pebble

Indeterminate; likely quartz-rich sandstone or chert

Sandstone Concretion

Ferruginous Sandstone Concretion

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Travertine

Terrestrial Sedimentary Calcite (CaCO3)

Diorite

Diorite (Intermediate intrusive igneous rock)

Tumbled blue-green stone, likely aquamarine-bearing pegmatite or blue apatite

Probable fluorapatite, Ca5(PO4)3(F,Cl,OH), though visual identification is uncertain

Arfvedsonite in Matrix

Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]

Petrified Wood

Silicified Wood (SiO2)

Marble

Recrystallized Calcite (CaCO3)

Quartz Pebble

Silicon Dioxide (SiO2)