Man Made Material, Not A Natural Rock Or Mineral Specimen

Red jasper

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

Gemstone jewelry ensemble

Likely mixed gemstone and glass-bead jewelry; exact stones cannot be determined from the image

Polished labradorite pendant

Labradorite, a calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)

Possible pink quartz specimen in a dark matrix

Uncertain from the image; possibly rose quartz (SiO₂) attached to a dark host rock

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)

Unidentified gray stone

Likely quartz-rich stone; exact identification is not possible from the image

Blue slag glass / industrial smelter slag

Man-made iron-rich silicate slag; composition variable, commonly Fe–Ca–Mg–Al silicates with glassy phases

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Polished orbicular jasper (likely ocean jasper)

Siliceous microcrystalline quartz/chalcedony with iron-oxide and volcanic inclusions; commonly called ocean jasper

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz, SiO2)

Rough turquoise-bearing rock (probable turquoise matrix)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a host-rock matrix

Sandstone (Quartzose)

Arenite (primarily SiO2)

Unidentified fine mineral/rock powder

Indeterminate from image; possibly crushed quartz-rich sand or finely milled rock

Weathered iron-rich rock fragment

Likely limonite/goethite with hematite and iron-bearing silicates; exact identification requires testing

Red jasper pebble

Jasper, an opaque, iron-oxide-colored variety of microcrystalline quartz (SiO₂)

Raw Diamond

Carbon (C)

Blue Goldstone

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

Banded Chert / Chalcedony

Silicon Dioxide (SiO2)

Blue slag glass / industrial glass fragment

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

Iron-rich rock, possibly limonite/goethite

Likely goethite (α-FeO(OH)) and/or limonite; exact identification requires testing

Mixed gravel and stone fragments

Unidentified lithic clasts; individual rock types cannot be determined from the image

Coral Rock (Coquina)

Biogenic Limestone (Calcium Carbonate - CaCO3)

Milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Mixed gemstone bead bracelet, likely lava rock and aventurine/jade-look beads

Basaltic scoria (vesicular basalt), plus probable serpentine, aventurine, or dyed quartzite beads

Sandstone

Sandstone (clastic sedimentary rock, predominantly SiO2)

Likely rough emerald-bearing rock

Emerald (beryl, Be₃Al₂Si₆O₁₈), possibly in mica- or quartz-rich matrix

Sandstone (Quartzose Sandstone)

Sandstone (SiO2 with various trace minerals)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Green cabochon gemstone, likely aventurine or dyed chalcedony

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

Diamond

Carbon (C)

Red granite boulder

Granite, a coarse-grained felsic intrusive igneous rock; commonly quartz + feldspar + mica

Weathered iron-rich rock (possibly limonite/goethite)

Likely goethite, α-FeO(OH), with possible limonite and other host-rock minerals

Sandstone (Calcareous or Ferruginous)

Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)

Rounded, weathered pebble (likely quartz-rich rock)

Indeterminate from the image; possibly quartzite or quartz-rich sandstone

Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)

Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)

Blue Glass or Slag Glass

Amorphous Silica (Anthropogenic Glass)

Greenstone / serpentinite carving

Serpentinite, chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile); exact identification requires testing

Sandstone (Ferruginous)

Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)

Diamond (in jewelry setting)

Carbon (C)

Banded sedimentary concretion

Likely a carbonate (calcite-rich) concretion with concentric mineral bands; exact composition cannot be confirmed from the image

Mixed tumbled gemstone collection

Varied minerals, likely including amethyst, sodalite/lapis lazuli, quartzite or aventurine, jasper, and agate/chalcedony

Tumbled brecciated jasper

Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions