Antropogenic (Man Made)

Limestone

Calcium Carbonate (CaCO3)

Faceted gemstone in a jewelry setting

Indeterminate from image; likely quartz, cubic zirconia, or another transparent faceted stone

Quartzite

Quartzite (SiO2)

Blue-green gemstone ring, likely treated turquoise or synthetic/treated beryl

Indeterminate from image; possibilities include turquoise (CuAl6(PO4)4(OH)8·4H2O), apatite, or treated beryl

Pink calcite (likely)

Calcite — calcium carbonate, CaCO₃

Likely bituminous coal

Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image

Polished dendritic agate cabochon (likely agate or jasper)

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

Diamond

Carbon (C)

Blue kyanite in quartz-rich matrix

Kyanite, Al₂SiO₅, in a quartz- and mica-bearing metamorphic rock

Rough Diamond

Diamond (Pure Carbon: C)

Iron meteorite (likely an etched or weathered display specimen)

Iron meteorite, composed chiefly of kamacite and taenite (Fe–Ni alloys)

Diamond

Carbon (C)

Weathered vesicular volcanic rock, likely pumice or scoria

Vesicular rhyolitic pumice or basaltic scoria; exact identification requires a clearer image and tests

Vesicular volcanic rock, likely weathered pumice or scoria

Pumice/scoria; predominantly volcanic glass and feldspar, with possible iron oxides

Polished red jasper beads

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

Loose faceted colorless gemstones, likely quartz or glass-like mineral chips

Most consistent with quartz (SiO₂), though the photograph cannot exclude synthetic cubic zirconia or glass

Diamond

Diamond (pure Carbon, C)

Diamond

Carbon (C)

Diamond

Carbon (C)

Polished jasper pendant

Jasper, microcrystalline quartz (SiO₂) with iron-oxide and other mineral inclusions

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Mixed stone-bead bracelet, likely agate/jasper and possibly sodalite or dyed quartz

Primarily microcrystalline quartz (SiO₂) varieties, with opaque iron-rich chalcedony/jasper and probable blue sodalite or dyed material

Tumbled greenstone / serpentinite (probable)

Serpentinite, chiefly Mg-rich serpentine minerals (antigorite, lizardite, chrysotile), possibly mixed with chlorite, magnetite, or carbonate

Inscribed limestone fragment

Calcitic limestone (primarily CaCO₃), possibly marble if recrystallized

Coal (Anthracite / Bituminous)

Organic Sedimentary Rock (Carbon-based)

Chert / Green Jasper

Silicon Dioxide (SiO2)

Likely lateritic ironstone (limonite/goethite-rich)

Goethite, α-FeO(OH), with possible limonite and clay impurities

Likely ironstone or iron-rich sandstone fragment

Iron-oxide-cemented sandstone; exact mineral composition cannot be confirmed from the photograph

Beaded blue-and-green gemstone jewelry

Likely dyed or treated chalcedony/agate and green aventurine or glass-like stone; exact identification requires testing

Polished black stone, likely basalt or black jasper

Indeterminate; possible fine-grained basalt (plagioclase–pyroxene) or black jasper/microcrystalline quartz

Vesicular Rhyolite

Rhyolite (High-silica volcanic rock)

Green Banded Chert (Agate/Jasper)

Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite

Weathered metallic fragment, possibly iron meteorite or industrial slag

Uncertain; candidate iron meteorite (Fe–Ni alloy), but terrestrial slag or corroded metal is also plausible

Gemstone bead necklace (likely citrine or yellow quartz)

Quartz, SiO₂; precise identification is uncertain because the beads are blurred and metal settings obscure them

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Amethyst bead bracelet

Amethyst, purple quartz (SiO₂), with likely dyed or heat-treated agate/carnelian beads

Native Silver

Silver (Ag)

Fossilized coral with attached shell

Likely fossil coral (Scleractinia or Tabulata), with a bivalve or gastropod shell; exact identification requires microscopy

Polished black stone egg, probably black obsidian

Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements

Green tourmaline (likely elbaite)

Tourmaline-group cyclosilicate; likely elbaite, Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

Chert (or Flint)

Chert (cryptocrystalline quartz), SiO2

Raw calcite specimen

Calcite, calcium carbonate (CaCO₃)