Not A Rock (Man Made Industrial Metal)

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Libyan Desert Glass

Tektite (high-silica impact glass), SiO2

Metal Alloy (Jewelry)

Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.

Opalite (Synthetic Moonstone/Sea Opal)

Silicon Dioxide (SiO2) glass with metallic inclusions

Bauxite

Bauxite (Al(OH)3, AlO(OH), AlOOH)

White quartz pebble or chip

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Unidentified translucent crystal/mineral fragment

Likely quartz (SiO₂), but visual identification is uncertain

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Concrete

Hydrated Portland Cement Aggregate Composite

Goldstone (Brown)

Aventurine Glass (Silicon Dioxide infused with Copper crystals)

Green Quartz / Chrysoprase / Sea Glass

Silicon Dioxide (SiO2)

Iron-rich meteorite candidate

Unclassified stony-iron or iron meteorite; possible weathered ordinary chondrite

Synthetic Blue Aura Quartz

Silicon Dioxide (SiO2) with Metallic Infusion

Uncertain small metallic-looking mineral/rock fragment

Indeterminate; possibly galena-bearing rock or metallic slag

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz–iron-oxide breccia or weathered quartz-bearing rock

Quartz (SiO₂) with limonite/goethite and possibly iron sulfides in a brecciated host

Likely metallic meteorite fragment

Undetermined; possibly an iron meteorite or stony-iron meteorite

Opalite

Synthetic Opalised Glass

Diorite (River Pebble)

Intermediate plutonic igneous rock

Green cabochon gemstone, likely aventurine or dyed chalcedony

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

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Aura Quartz / Rainbow Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Red garnet stud earrings (likely garnet)

Garnet group; most likely almandine, Fe₃Al₂(SiO₄)₃. The image alone cannot confirm the stone or whether it is natural.

Opalite (a synthetic glass)

Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Dyed or synthetic turquoise-blue glass-like specimen

Likely man-made colored glass or resin; exact identification requires testing

Titanium Coated Aura Quartz (Apple Aura Quartz)

Silicon Dioxide (SiO2) with Metallic Vapor Deposition Coating

Quartzite

Quartzite (SiO2)

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Likely metallic meteorite fragment

Unclassified iron-rich meteorite candidate; possible iron meteorite or stony-iron specimen

Aura Quartz (Titanium/Rainbow Quartz)

SiO2 (Silicon Dioxide) with metallic coating

Decorative gemstone bracelet or jewelry

Unidentifiable from the blurred image; likely colored glass or synthetic stones, possibly mixed gemstone beads

Iron-rich meteorite candidate

Unclassified stony-iron or iron meteorite; possible weathered ordinary chondrite

Sandstone Concretion

Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)

Libyan Desert Glass

Libyan Desert Glass (SiO2 with trace elements)

Mother of Pearl (Nacre)

Aragonite (CaCO3) with Organic Matrix

Diamond (Cut Gemstone)

Natural Carbon (C)

Bismuth Crystal

Bismuth (Bi)

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Opalite

Synthetic Opalized Glass (SiO2 + additives)

Green aventurine bead bracelet

Quartz (SiO₂), typically green quartzite/aventurine colored by fuchsite mica or other inclusions