Anthropogenic Specimen (Man Made)

Chert (Arrowhead variety)

Chert (SiO2)

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Vein (Iron-stained)

Silicon Dioxide (SiO2) with limonite/hematite staining

Riverstone Jasper (Chalcedony)

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Rough Diamond

Diamond (pure carbon / C)

Orbicular Jasper (Ocean Jasper)

Silicon Dioxide (SiO2) with iron and magnesium inclusions

Quartzite with Iron Mineral Banding

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Mica Schist with Iron Staining

Muscovite/Biotite Schist

Fossilized Shark Tooth (Dermal Denticle or worn tooth fragment)

Elasmobranchii (fossil remains)

Jasper (Iron-stained)

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone (Quartz Sandstone)

Arenite (primarily SiO2)

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood / Chalcedony (SiO2)

Yellow Quartz (Citrinated Quartz)

Silicon Dioxide (SiO2)

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Basalt Riverstone

Basalt (Aphanitic Mafic Volcanic Rock)

Basalt (Beach Pebble)

Extrusive mafic volcanic rock

Chert Nodule (with Flint core)

Sedimentary Cryptocrystalline Quartz (SiO2)

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Biogenic Inclusions

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Sandstone

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Quartzite Cobble

Meta-quartzite (SiO2)

Jasper Agate (specifically Brecciated Jasper)

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Jasper (specifically Polychrome or Desert Jasper)

Silicon Dioxide with impurities (SiO2)

Glacial Erratic (Sandstone/Quartzite)

Glacial Erratic specimen (likely Orthoquartzite or Feldspathic Sandstone)

Basalt (River Pebble)

Basalt

Basalt

Basalt (Mafic volcanic rock)

Basalt Pebble

Extrusive mafic igneous rock; primarily (Ca, Na)(Mg, Fe, Al)Si2O6 and (Ca, Na)AlSi3O8

Basalt with inclusion

Basalt (Aphanitic-Porphyritic texture)

Sandstone (likely with Quartz Veining)

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Quartzite (River Cobble)

Metamorphic Rock (composed predominantly of SiO2)

Limonite

Limonite (Hydrous iron oxides, FeO(OH)·nH2O)

Basalt (Polished Pebble)

Basalt (Mafic volcanic rock)

Rough Amber (likely Copal or immature Amber)

Organic gemstone / Succinite (if Baltic)

Granite

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

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)

Basalt River Pebble

Basalt (fine-grained mafic igneous rock)

Sandstone

Arenite (primarily SiO2)