Anthropogenic Specimen (Man Made)

Slag

Anthropogenic Vitreous Silicate / Ferro-silicate Slag

Quartzite pebble

Quartzite (SiO2)

Asphalt (Bituminous Concrete)

Asphaltum / Bitumen-Aggregate Matrix

Slag

Ferrous Slag (Siliceous industrial waste)

Colorless faceted gemstone, likely glass or cubic zirconia

Uncertain; possible cubic zirconia (ZrO₂) or quartz (SiO₂), but the image may show a man-made simulant

Colorless faceted quartz-like gemstone

Likely quartz (SiO₂), though the appearance may also indicate man-made glass or cubic zirconia

Colorless faceted gemstone, likely quartz

Quartz (SiO₂), tentative identification; the photo is insufficient to confirm the material

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various additives

Slag (Industrial Glass)

Anthropogenic Vitreous Slag (Post-industrial byproduct)

Iron Slag

Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)

Polished brown chalcedony (likely carnelian or jasper)

Microcrystalline quartz, SiO₂; iron oxides produce the brown coloration

Chert Arrowhead

Cryptocrystalline microcrystalline Quartz (SiO2)

Quartzite Arrowhead (Archaeological Lithic)

Recrystallized Quartz (SiO2)

Cobalt Blue Slag Glass

Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives

Ferrous Slag (Iron Smelting By-product)

Fused Siliceous Slag

Chert (Honey Chert / Flint)

Silicon Dioxide (SiO2)

Polished hematite (specimen identification uncertain)

Hematite, α-Fe₂O₃

Quartzite

Metamorphic Quartzite

Quartzite

Metamorphic Quartzite (SiO2)

Belemnoit (Fossil)

Belemnoidea (Order), Rostrum / Guard

Petoskey Stone / Rugose Coral Fossil

Hexagonaria percarinata

Terrazzo (with Marble and Granite fragments)

Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates

Siltstone Pebble

Siltstone (composed of microscopic quartz and clay minerals)

Limestone

Calcareous sedimentary rock (CaCO3)

Tumbled quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Mica Schist

Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)

Fossil Coral

Scleractinia (Stony Coral) fossil

Carved yellow stone butterfly

Undetermined; possibly carved soapstone (talc-rich rock) or another soft ornamental stone

Concrete or asphalt-like aggregate surface with a dark fragment

Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock

White drusy quartz

Quartz, silicon dioxide (SiO₂), with a drusy coating of tiny crystals

Polished blue chalcedony (possibly agate)

Microcrystalline quartz, SiO₂; chalcedony, potentially banded agate

Exposed aggregate concrete (stone-chip surface)

Portland-cement concrete containing natural aggregate; not a natural rock

Chert (Arrowhead Debitage or Flake)

Microcrystalline silica (SiO2)

Tumbled chalcedony pendant (likely agate)

Chalcedony, microcrystalline quartz (SiO₂); the pale bands suggest agate

Peanut Wood

Petrified Wood (Silicified Araucaria with Teredo boreholes)

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Sandstone

Arenite (SiO2 based clastic rock)

Diamond (in a jewelry setting)

Diamond (Carbon, C)

Unidentified gray stone/concrete-like fragment

Indeterminate; likely a fine-grained carbonate or cementitious geological fragment

Asphalt (Bituminous Concrete)

Bituminous Concrete / Pavement

Diamond

Native Carbon (C)

Sandstone

Arenite (specifically sublithic or quartz arenite)