Not A Rock (Man Made Industrial Metal)

Blue glassy fragment among beach gravel

Likely cobalt-blue man-made glass; not a natural mineral specimen

Quartzite (or Milky Quartz pebble)

Quartzite (primarily Silicon Dioxide, SiO2)

Green cabochon gemstone, likely nephrite jade

Nephrite jade—interlocking amphibole fibers, chiefly tremolite-actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂

Diamond (in jewelry setting)

Diamond (C - Carbon)

Quartz Vein in Granite

Crystalline Silicon Dioxide (SiO2) in Granitic Matrix

Likely iron-rich rock or weathered metallic mineral fragment

Uncertain; possibly limonite/goethite or iron-bearing slag

Small metallic-looking mineral/rock fragment

Indeterminate from image; possibly galena, hematite, or metallic slag

Desert Rose (also known as Sand Rose)

Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions

Vesicular basalt (possibly scoriaceous basalt)

Basalt; chiefly plagioclase feldspar, pyroxene, and iron-rich minerals

Silver Nugget

Native Silver (Ag)

Quartzite

Quartzite (SiO2)

Libyan Desert Glass

Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)

Tumbled greenstone (likely serpentinite or green jasper)

Serpentinite, commonly dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing

Diamond (in jewelry)

Carbon (C)

Asphalt (Bituminous Concrete)

Bituminous mix / Anthropogenic conglomerate

Native copper (probable copper-rich mineral specimen)

Copper, Cu; possibly mixed with cuprite, malachite, and iron-oxide alteration minerals

Clear gemstone earring (likely cubic zirconia)

Cubic zirconia (synthetic zirconium dioxide, ZrO₂); identification from the image is uncertain

Basalt

Basalt (containing plagioclase, pyroxene, and olivine)

Gold-bearing quartz vein in dark host rock

Native gold (Au) with quartz (SiO₂), likely in slate, schist, or altered volcanic rock

Slag Glass (Cullet Glass)

Amorphous Silica (Industrial byproduct)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Peridot

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Aquamarine

Beryl (Be3Al2Si6O18)

Hoodoo (Limestone / Siltstone Formation)

Claron Formation (Sedimentary Rock - Limestone, Mudstone, Dolomite)

Serpentine

(Mg,Fe)3Si2O5(OH)4

Metallic iron meteorite (probable)

Iron meteorite, typically kamacite–taenite (Fe–Ni alloy)

Granite

Intrusive igneous rock

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Probable metallic meteorite fragment

Unclassified iron meteorite candidate, chiefly kamacite (α-Fe–Ni alloy)

Iron-rich meteorite candidate

Probable ordinary chondrite or iron meteorite fragment; identification requires testing

Goldstone and Aura Quartz

Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)

Small metallic meteorite fragment (probable stony-iron or iron meteorite)

Unclassified meteoritic material; exact classification requires chemical and petrographic testing

Faceted glass-like gemstone object

Likely synthetic glass or cubic zirconia; exact material cannot be confirmed from the image

Dark rounded pebble, likely basalt or slag

Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag

Diamond

Native Carbon (C)

Red gemstone ring, likely synthetic ruby or garnet

Ruby: corundum (Al₂O₃); possible alternative: almandine garnet (Fe₃Al₂(SiO₄)₃)

Synthetic Faux Fur Fursuit

Polyacrylonitrile / Polyester (Synthetic Textile)

Polished serpentine pendulum

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

Copper Ore (Malachite and Azurite stained rock)

Copper-bearing rock with secondary copper carbonates

Silver (Native Element)

Ag (Argentum) - 90% Silver, 10% Copper alloy in specimen

Moissanite

Silicon Carbide (SiC)

Asphalt Pavement (with aggregate)

Asphalt concrete