Man Made Material, Not A Natural Rock Or Mineral Specimen

Slag

Ferrous Slag (Siliceous industrial waste)

Blue Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Dragon Vein Agate (Dyed/Treated)

Agate (SiO2)

Unidentified gray stone

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

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz, SiO2)

Polished orbicular jasper (likely ocean jasper)

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

Red jasper

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

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Diamond (in Jewelry)

Carbon (C)

Unidentified fine mineral/rock powder

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

Graphite

Graphite (Carbon, C)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Rough turquoise-bearing rock (probable turquoise matrix)

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

Blue slag glass / industrial glass fragment

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

Weathered iron-rich rock fragment

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

Polished labradorite pendant

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

Raw Diamond

Carbon (C)

Banded Chert / Chalcedony

Silicon Dioxide (SiO2)

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

Iron-rich rock, possibly limonite/goethite

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

Blue slag glass / industrial smelter slag

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

Sandstone

Sandstone (clastic sedimentary rock, predominantly SiO2)

Sandstone (Calcareous or Ferruginous)

Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)

Diamond

Diamond (pure Carbon, C)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Blue Goldstone

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

Green cabochon gemstone, likely aventurine or dyed chalcedony

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

Coral Rock (Coquina)

Biogenic Limestone (Calcium Carbonate - CaCO3)

Sandstone (Quartzose Sandstone)

Sandstone (SiO2 with various trace minerals)

Sandstone (Ferruginous)

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

Greenstone / serpentinite carving

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

Quartz

Silicon dioxide (SiO₂)

Mixed tumbled gemstone collection

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

Blue Glass or Slag Glass

Amorphous Silica (Anthropogenic Glass)

Sandstone (specifically Banded Sandstone)

Clastic sedimentary rock (primarily SiO2)

Diamond (in jewelry setting)

Carbon (C)

Tumbled brecciated jasper

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

Weathered granite or granitic gneiss block

Granite, chiefly quartz, feldspar, and mica; possibly gneiss if the visible banding is structural

Likely weathered quartz-rich rock fragment

Indeterminate; possibly quartz-bearing sandstone or chert with iron-oxide staining

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)

Tumbled iron-rich stone, likely hematite-bearing jasper

Jasper (microcrystalline quartz, SiO₂) with iron oxides, chiefly hematite/goethite