Man Made Material (Anthro Lithic Product)

Sandstone

Quartzose Sandstone / Lithic Sandstone

Slag (Industrial)

N/A (Anthropogenic Slag)

Coarse sand with a small pebble

Unconsolidated siliciclastic sediment, chiefly quartz and rock fragments

Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Tuffaceous sandstone or volcanic tuff

Lithic/feldspathic tuffaceous sandstone; composition likely quartz, feldspar, volcanic ash, and lithic fragments

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock

Chert (Arrowhead)

Microcrystalline Quartz (SiO2)

Weathered quartz-rich rock, possibly granite or quartzite

Indeterminate; likely quartz–feldspar aggregate, potentially granitic, or recrystallized quartzite

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Dyed Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial pigment

Chalcedony (likely prehistoric flaked point)

Microcrystalline quartz, SiO₂; possibly green chalcedony or silicified volcanic material

Pebble / Rounded Rock

Lithic fragment / Water-worn rock

Chert (specifically as a lithic artifact/projectile point)

Chert (Silicon dioxide, SiO2)

Vesicular volcanic rock, likely pumice or scoria

Pumice/scoria; predominantly silica-rich volcanic glass with feldspar and possible quartz or mafic minerals

Quartz with Limonite Staining

Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)

Sandstone

Arenite (lithic or quartz sandstone)

Conglomerate (River Rock Aggregate)

Conglomerate (Lithic-clast conglomerate)

Note on Image Identification: Textile

N/A (Anthropogenic material)

Chert (Field-collected Arrowhead-shaped Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Tumbled aqua glassy mineral specimen, likely chrysocolla or turquoise imitation

Uncertain from image; possible chrysocolla (hydrated copper aluminosilicate, variable composition) or dyed/man-made glass

Quartz-rich pegmatite with iron-stained quartz

Quartz (SiO₂) in granitic pegmatite, likely with feldspar and iron-oxide staining

Diamond

Carbon (C)

Diamond

Carbon (C)

Conglomerate

Clastic Conglomerate (Lithic-rich)

Glacial Erratic (Graywacke/Sandstone)

Clastic Sedimentary Rock (Lithic Sandstone)

Slag (Industrial By-product)

Anthropogenic Vitreous Silica/Iron Silicate

Gold ring with a dark, possibly gemstone setting

Gold alloy; the dark setting is not identifiable from the image

Faience and Carnelian in Egyptian Revival Jewelry

Faience (quartz frit) and Carnelian (chalcedony, SiO2)

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Pebble

Lithic fragment / Water-worn rock

Sandstone

Arenite (lithic or quartz sandstone)

Note: Item is a Synthetic/Man-made Object

Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)

Blue Sapphire (Synthetic or Man-made Glass Imitation)

Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Sandstone (with Moss/Lichen Growth)

Sandstone (Quartz Arenite / Lithic Arenite)

Black stone bead bracelet

Likely black tourmaline (schorl), though identification is uncertain from the image

Weathered conglomeratic or breccia cobble

Lithified polymictic conglomerate/breccia, likely iron-stained siliciclastic rock

Red Tuff / Sandstone

Rhyolitic Tuff / Pyroclastic Volcanic Rock

Pumice

Pumice (Volcanic Rock)