Anthropogenic Specimen (Man Made Material)

Painted River Rock

Anthropogenic-modified Siliciclastic Sedimentary Rock

Pink Quartz / Sea Glass

Silicon Dioxide (SiO2)

Mystic Topaz

Aluminum Silicate Fluoride Hydroxide (Al2SiO4(F,OH)2) with metallic film coating

Opalite

Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)

Fossil or modern bivalve shell

Calcium carbonate shell, likely aragonite (CaCO₃); exact species cannot be determined from the image

Obsidian (Blue)

Volcanic Glass (SiO2)

Blue Cracked Quartz (Dyed Fire Crackle Quartz)

Silicon Dioxide (SiO2) with synthetic dye

Slag

Metallurgical Slag

Sea Glass (Cobalt Blue)

Amorphous Silica (Glass with Cobalt additives)

Likely chert (flint)

Microcrystalline quartz (SiO₂), likely chert; exact identification is uncertain from the image alone

Unidentified gray stone/concrete-like fragment

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

Flint (chert)

Microcrystalline quartz (SiO₂), a variety of chert

Carved yellow stone butterfly

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

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Chert (Honey Chert / Flint)

Silicon Dioxide (SiO2)

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions

Chert (likely flint)

Microcrystalline quartz, SiO₂

Opalite

Synthetic Glass (Simulated Moonstone/Opal)

Diamond (or Cubic Zirconia)

Carbon (C) or Zirconium Dioxide (ZrO2)

Quartz (likely milky quartz or quartz glass-like fragment)

Quartz, silicon dioxide (SiO₂)

Flint (gray chert)

Microcrystalline quartz (SiO₂), a variety of chert

Tumbled opalite (likely man-made glass)

Opalite, a trade name for opalescent glass; not natural opal

Carved Stone Turtle

Carved Soapstone and Quartz

Rock crystal quartz fragments

Quartz (silicon dioxide, SiO₂)

Blue Goldstone

Aventurine Glass

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Polished gemstone tower assortment

Primarily quartz varieties and simulants; apparent amethyst (SiO₂), rose quartz (SiO₂), clear quartz (SiO₂), fluorite (CaF₂), sodalite, malachite, and possibly dyed or composite stones

Likely flint (dark chert)

Microcrystalline quartz (SiO₂), commonly called chert or flint

Possible obsidian or slag glass

Volcanic glass, primarily SiO₂; alternatively industrial iron-rich glassy slag

Exposed aggregate concrete (stone-chip surface)

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

Pink Tumbled Quartz (Dyed)

Silicon Dioxide (SiO2)

Basalt

Basalt (Mafic volcanic rock)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Weathered concrete or cementitious slab (not natural rock)

Artificial calcium-silicate cement composite; likely Portland cement concrete

Diamond (in a gold ring)

Diamond (pure carbon, C)

Cubic Zirconia (Simulated Diamond)

Cubic Zirconia (ZrO2)

Blue-dyed tumbled quartz or glass imitation

Quartz (SiO₂), appearance possibly enhanced with blue dye; identity uncertain from image

Sea Glass

Amorphous silicon dioxide (SiO2) - Man-made glass tumbled by nature

Blue Goldstone

Man-made glass with suspended copper, cobalt, or manganese particles

Mixed beach-stone and tumbled-glass collection

Predominantly uncertain rocks (likely basalt, granite, and quartz-bearing stones) with anthropogenic glass; one possible banded agate or jasper