Anthropogenic (Man Made Material Processed By Nature)

Iron Slag

Ferrous Slag (Silicate/Oxide mixture)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Green tourmaline (likely chrome/dravite tourmaline crystals)

Tourmaline-group cyclosilicate; commonly elbaite, dravite, or chromdravite, complex borosilicate formula

Polished greenstone/serpentine pebble (probable)

Serpentinite, dominated by serpentine-group minerals (lizardite/chrysotile); possible accessory olivine or chlorite

Tumbled pale-yellow chalcedony (possibly yellow jasper)

Microcrystalline quartz, SiO₂; chalcedony/jasper varieties

Banded agate bangle

Agate (microcrystalline quartz, SiO₂), likely gray-blue chalcedony with parallel banding

Tumbled carnelian (likely chalcedony)

Carnelian, orange-red cryptocrystalline quartz (SiO₂), a variety of chalcedony

Brown Jasper (Likely)

Jasper (Cryptocrystalline Silicon Dioxide - SiO2)

Likely tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), potentially hematite/goethite-bearing

Black tourmaline beads (likely schorl)

Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Granite

Granite (Felsic Plutonic Rock)

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Amethyst and smoky quartz jewelry

Amethyst: purple quartz, SiO₂; likely smoky quartz: irradiated/naturally colored quartz, SiO₂

Gold-colored gemstone ring, likely citrine or glass imitation

Indeterminate from image; possible quartz (SiO₂) or yellow glass set in gold-colored metal

Tumbled carnelian

Carnelian, a red-orange variety of chalcedony (microcrystalline quartz, SiO₂)

Chert (Flint)

Silicon dioxide (SiO2)

Polished black-and-white banded agate (likely dyed or painted)

Chalcedony (microcrystalline quartz), SiO₂; exact banding variety uncertain

Polished yellow-green serpentine pendant

Serpentine-group minerals, chiefly antigorite and/or lizardite; approximate formula Mg3Si2O5(OH)4

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Petrified Wood

Silicified Wood (primarily SiO2)

Likely industrial slag or weathered basalt

Basaltic rock; possibly iron-rich furnace slag (diagnosis uncertain from image)

Rounded quartz pebble

Quartz (silicon dioxide, SiO₂)

Tumbled quartz (likely milky/rose quartz)

Quartz, silicon dioxide (SiO₂)

Tumbled carnelian (likely)

Cryptocrystalline chalcedony, SiO₂; orange-red variety commonly called carnelian

Granite

Granite (composed mainly of Quartz, Feldspar, and Mica)

Polished red jasper mushroom carving

Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides

Quartzite Arrowhead (Archaeological Lithic)

Recrystallized Quartz (SiO2)

Iron Slag

Ferrous Slag (Industrial Byproduct)

Pink Tumbled Agate

Silicon Dioxide (SiO2) with dye

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂), cryptocrystalline to microcrystalline variety

Blue slag glass / industrial glass fragment

Artificial silicate glass, composition variable; likely copper- or cobalt-colored furnace slag

Green aventurine pendant

Quartz variety, SiO₂, colored mainly by fuchsite or other chromium-bearing mica inclusions

Likely rose quartz or quartz-rich stone

Quartz, silicon dioxide (SiO₂); pink coloration may reflect trace iron, titanium, or inclusions

Diamond (or Diamond Simulant)

Carbon (C)

Polished druzy quartz specimen

Quartz (SiO₂), likely druzy quartz with possible blue chalcedony or inclusions

Weathered iron-rich rock fragment

Likely limonite/goethite-rich ironstone; exact identification requires testing

Tumbled blue glassy mineral, possibly sodalite or blue aventurine

Identification uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) or blue-dyed quartz/slag-like material

Polished dendritic agate or jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

Tumbled red jasper

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Granite

Phaneritic plutonic rock (dominated by Quartz, Feldspar, and Mica)

Slate

Metamorphic Pelitic Rock