Anthropogenic (Human Made) Sedimentary Like Material

Vesicular basalt (possibly slag-contaminated)

Basalt; chiefly plagioclase and pyroxene, with possible olivine and secondary minerals

Green glassy slag (often sold as “sea glass” or “green obsidian”)

Industrial vitreous slag; primarily amorphous silicate glass, composition variable

Cupronickel (on a 1981 Mexico 20 Pesos coin)

Copper-Nickel Alloy (Cu75Ni25)

Asphalt (Road Aggregate)

Bituminous Conglomerate / Asphalt Concrete

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (specifically Tan/Gray Chert)

Microcrystalline quartz (SiO2)

Chert (and Flint)

Silicon Dioxide (SiO2)

Green cabochon gemstone, likely aventurine or dyed chalcedony

Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony

Carved quartz (likely rose quartz and green aventurine/quartz)

Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine

Green sea glass or green glass-like tumbled material

Amorphous silicate glass; likely anthropogenic soda-lime glass, not a natural mineral

Slag (Industrial Glassy Byproduct)

Anthropogenic silicate byproduct (Slag)

Chert (Flint)

Silicon Dioxide (SiO2)

Faceted colorless gemstone, likely quartz or glass imitation

Most likely quartz (SiO₂), though the strong glare and visible facet pattern could indicate cubic zirconia or lead glass

Amethyst gemstone ring

Quartz, purple variety — SiO₂

Chert (River Pebble)

Silicon Dioxide (SiO2)

Chert (Chert / Flint Variety)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Conglomerate (Asphaltic/Anthropogenic)

Clastic sedimentary rock / Bituminous mixture

Polished dendritic agate cabochon (likely agate or jasper)

Microcrystalline quartz, SiO₂, commonly chalcedony with iron-oxide inclusions

Asphalt (Road Aggregate)

Bituminous conglomerate

Goldstone

Avventurina (Cu + SiO2 glass)

Asphalt / Road Aggregate

Bituminous Conglomerate (synthetic)

Chert (White Chert/Flint)

Microcrystalline Quartz (SiO2)

Carved Stone Turtle

Carved Soapstone and Quartz

Red Sandstone or Brick Fragment

Arenite (if sandstone)

Sandstone

Arenite (composed primarily of SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Banded agate cabochon

Microcrystalline quartz (chalcedony), SiO₂

Chert (often called Flint in archaeological contexts)

Silicon Dioxide (SiO2)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Chert (often called Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert / Flint

Silicon Dioxide (SiO2)

Chert (flint) fragment

Microcrystalline quartz (SiO₂), commonly called chert or flint

Chert (Arrowhead)

Microcrystalline Quartz (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Tumbled yellow jasper or chalcedony

Microcrystalline quartz, SiO₂; likely iron-oxide-bearing jasper/chalcedony

Concrete

Hydrated Portland Cement Aggregate Composite

Flint (or Chert with cortex)

Silicon dioxide (SiO2)

Decorative mosaic cross containing mixed rock and glass fragments

Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass

Blue Impression Jasper beads

Impression jasper (microcrystalline quartz/chalcedony), chiefly SiO₂, with iron-oxide and other mineral inclusions

Blue glassy mineral fragment, possibly sodalite or dyed/cobalt glass

Uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) if natural, but vivid blue color may indicate cobalt-colored glass

Chert (varietal: Flint/Jasper)

Silicon Dioxide (SiO2)