Mineral (Man Made Composite)

Glass

Amorphous Silicon Dioxide (SiO2)

Concrete

Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)

Opalite (likely man-made opalescent glass)

Opalite; not a true mineral, typically synthetic opalescent glass (silica-based)

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Tumbled clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Opalite

Man-made Synthetic Glass (Silicon Dioxide with metal additives)

Opalite

Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)

Goldstone

Aventurine glass

Cherry Quartz

SiO2 (Silicon Dioxide with iron-rich inclusions/dye)

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Polished labradorite sphere

Labradorite, calcic plagioclase feldspar ((Ca,Na)(Al,Si)₄O₈)

Polished labradorite pendant

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

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Hematite

Iron(III) oxide (Fe2O3)

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Opalite

Synthetic Glass (Amorphized Silicon Dioxide)

Slag

Glassy silicate byproduct (anthropogenic material)

Opalite (Synthetic Moonstone/Opal)

Synthetic Silica Glass

Fluorite (Polished Point/Tower)

Calcium Fluoride (CaF2)

Libyan Desert Glass

Libyan Desert Glass (SiO2 with trace elements)

Sea Glass

Man-made vitreous material (silica-based glass)

Sea Glass

Man-made silicate glass (Amorphous silicon dioxide)

Sandstone Concretion

Septarian or Carbonate-cemented Sandstone Concretion

Bismuth

Bismuth (Bi)

Slag

Metallurgical by-product

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Zinc Alloy (Silver-plated)

Zinc Alloy Casting (Zn-Al-Mg-Cu)

Chert (Chalky Flint Node)

Chert (Microcrystalline Quartz, SiO2)

Cubic Zirconia (Man-made)

Cubic Zirconia (ZrO2) with Enamel and Metal Alloy

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate

Opalite

Synthetic Opalite Glass

Opalite

Synthetic Opalised Glass

Opalite

Synthetic Silicon Dioxide (SiO2)

Slag Glass

Anthropogenic Amorphous Silicon Dioxide

Rainbow Hematite (Titanium Coated)

Iron(III) oxide (Fe2O3) with Titanium/Metal Oxide coating

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Tumbled opalite (likely man-made glass)

Opalite, a trade name for opalescent glass; not natural opal

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Slag

Metallurgical Slag

Likely tumbled or cut quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz