Anthropogenic (Man Made Product Subject To Geological Processes)

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Carved Mottled Greenish-Yellow Crystal/Glass Object

Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.

Popcorn

Zea mays everta (P. Wilson) (Botanical name for the corn variety)

Vesicular basalt (possibly slag-contaminated)

Basalt; chiefly plagioclase and pyroxene, with possible olivine and secondary minerals

Limonite

Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

Black beaded bracelet, likely black onyx or glass

Possibly chalcedony (microcrystalline quartz, SiO₂); the beads may instead be man-made glass

Tumbled chalcedony (likely milky quartz)

Microcrystalline quartz, SiO₂; possibly pale agate or quartzite

Goldstone

N/A (Synthetic Glass with Copper Inclusions)

Green Aura Quartz

Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)

Green glassy slag (often sold as “sea glass” or “green obsidian”)

Industrial vitreous slag; primarily amorphous silicate glass, composition variable

Polished yellow-green serpentine pendant

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

Asphalt (Aggregate)

Bituminous macadam / Concrete Aggregate

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Weathered quartzite cobble

Quartzite (recrystallized quartz, SiO₂)

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Magnetic Hematite

Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)

Orange Quartz (Citrine Quartz)

Silicon Dioxide (SiO2) with iron impurities

Mica Schist

Metamorphic rock predominantly composed of muscovite or biotite with quartz and feldspar

Note: Item is a Synthetic/Man-made Object

Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)

Sea Glass (Turquoise/Aqua)

Amorphous Silica (SiO2) with transition metal dopants

Red Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Sea Glass (Cobalt Blue)

Amorphous Silica (Glass with Cobalt additives)

Malaysian 50 Sen Coin

Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)

Tumbled opalite (likely synthetic glass)

Opalite; typically man-made opalescent soda-lime glass, not a recognized mineral species

Blue Slag Glass

Ferro-silicate glass (Slag)

Limonite (Iron Ore)

Hydrous Iron Oxide (goethite, lepidocrocite)

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Native Silver

Silver (Ag)

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

Bismuth crystal

Bismuth (Bi), synthetic laboratory-grown crystal

Quartz

Quartz (SiO₂)

Blue goldstone beads

Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli

Tumbled orange calcite

Calcite (CaCO₃), likely orange variety

Hematite

Hematite (Fe2O3)

Yellow chalcedony (likely lemon agate or yellow jasper)

Microcrystalline quartz, SiO₂; possibly iron-bearing jasper or chrysoprase-like chalcedony

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Yellow cabochon gemstone, likely citrine or yellow glass imitation

Quartz (SiO₂), if natural citrine; visual evidence is insufficient to exclude man-made glass or resin

Nickel coin (U.S. currency)

Cupronickel (75% Copper, 25% Nickel alloy)

Iron-rich vesicular rock, possibly slag or weathered basalt

Identification uncertain; likely ferruginous basalt/ironstone, with possible anthropogenic iron slag