Industrial Byproduct

Agate

Chalcedony (SiO2)

Wavellite with Quartz

Al3(PO4)2(OH,F)3 & SiO2

Diamond and Sapphire

Carbon (Diamond, C) and Aluminum Oxide (Sapphire, Al2O3)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) vein cutting through host rock

Garnet

Almandine (Fe3Al2(SiO4)3)

Coal

Bituminous or Anthracite coal (carbon-rich sedimentary rock)

Blue tumbled glass-like specimen; likely blue slag glass

Likely man-made glass (silicate glass), not a natural mineral; exact material cannot be confirmed from the image

Dyed Agate

Cryptocrystalline variety of Silica (SiO2)

Carbonado (Black Diamond)

Carbonado (Polycrystalline Diamond)

Quartzite Pebbles

Quartzite (SiO2)

Dark blue-black polished crystal, likely fluorite or slag-like geological material

Tentatively fluorite (CaF₂); identification is uncertain from the image alone

Iron-rich meteorite candidate

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

Cubic Zirconia

Zirconium Dioxide (ZrO2)

Orange calcite

Calcite (CaCO₃), likely honey/orange calcite

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Small dark metallic-looking rock fragment

Undetermined; possibly iron oxide-rich material or a metallic mineral

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

Red faceted gemstone, likely synthetic ruby or red glass imitation

Possibly synthetic corundum (Al₂O₃:Cr³⁺); image alone cannot distinguish it from glass or another imitation

Silver Flakes in Glass

Silver (Ag)

Purple glassy pebble, possibly slag glass

Unidentified; likely man-made glass rather than a natural mineral

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Engineered Quartz Stone

Agglomerated Quartz (SiO2 + Polymer Resin)

Note: Item is a Synthetic/Man-made Object

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

Goldfish Cracker (Culinary Mimic)

Cibus aurum (Commonly composed of Enriched Wheat Flour and Cheddar Cheese)

Bowling Ball (Brunswick T-Zone Deep Space)

Polyester resin / Polyurethane polymer

Garnet

Garnet group (X3Y2(SiO4)3)

Tumbled dark stone, likely basalt or gabbro

Basalt (fine-grained mafic rock), possibly gabbro; mainly plagioclase and pyroxene

Likely iron-rich meteorite fragment

Unclassified iron oxide–rich meteorite; composition cannot be confirmed visually

Iron-rich meteorite candidate

Unclassified meteoritic iron–stone material; possible stony-iron meteorite or terrestrial ironstone

Rough Diamond

Diamond (Native Carbon, C)

Limonite (Ironstone Concretion)

Limonite (Hydrous ferric oxide mixture, FeO(OH)·nH2O)

Magnetic Hematite (Man-made)

Iron Oxide (Fe2O3) with Barium-Strontium Ferrite

Blue Crackle Quartz (Dyed Fire Agate/Quartz)

Silicon Dioxide (SiO2) with artificial dye treatment

Small tan mineral or rock fragment (unidentified)

Indeterminate from the image; no diagnostic features are visible

Ruby (set in a ring; possibly synthetic or imitation)

Corundum, Al₂O₃; red color is typically caused by chromium

Polished banded jasper (likely red-and-gray jasper)

Microcrystalline quartz (SiO₂), commonly termed jasper; exact variety cannot be confirmed from the photo

Possible iron-oxide concretion with a dark mineral cap

Iron-oxide–cemented sedimentary concretion; exact composition cannot be determined from the image

Red faceted gemstone, possibly ruby

Corundum (Al₂O₃), if ruby; image alone cannot confirm identity or natural origin

Red faceted gemstone, possibly ruby (identification uncertain)

Ruby, if natural: corundum (Al₂O₃) colored by chromium

Yellow Quartz

SiO2

Small brown pebble, likely iron-stained quartz or chert

Unidentified quartz-rich or microcrystalline silica pebble (SiO₂)