Man Made Material (Jewelry, Metal Alloy)

Petrified Wood

Silicified Wood (SiO2)

Blue quartzite or blue aventurine glass-like aggregate

Quartzite, predominantly SiO₂ (identification uncertain from image)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)

Polished dendritic agate or jasper

Microcrystalline quartz (SiO₂), likely chalcedony with manganese-oxide dendrites

Tumbled pegmatitic granite

Coarse-grained granite/pegmatite, chiefly quartz, feldspar, and biotite or amphibole

Tanzanite

Blue-violet Zoisite (Ca2Al3(SiO4)3(OH))

Petrified Wood

Petrified Wood (Silicified Wood)

Synthetic Costume Glove (Paws)

Polyethylene terephthalate (Polyester) & Polyurethane blend

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of cellulose)

Pyrite

Iron Pyrite (FeS2)

Chert (Flint)

Silicon Dioxide (SiO2)

Dyed howlite or turquoise imitation

Howlite: Ca₂B₅SiO₉(OH)₅; turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O

Petrified Wood

Silicified Wood (SiO2 as Quartz/Chert/Chalcedony)

Polished tiger’s-eye cabochon (probable)

Quartz variety, SiO₂, with fibrous riebeckite/crocidolite-derived inclusions

Pyrite

Iron Disulfide (FeS2)

Petrified Wood

Silicified Wood (SiO2)

Diamond (or Diamond Simulant)

Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)

Conical fossil shell or shell fragment

Likely a gastropod shell fragment; exact taxon indeterminate from the image

Fossil gastropod shell

Fossilized marine gastropod; exact genus/species requires locality and examination

Quartz

Silicon Dioxide (SiO2)

Chert (often called Jasper or Flint)

Silicon Dioxide (SiO2)

Caliche (with Lichen Cover)

Calcium carbonate-cemented soil layer (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Polished blue agate/geode slice

Chalcedony (microcrystalline quartz, SiO₂), likely dyed blue

Polished blue sodalite cabochons

Sodalite, Na₈Al₆Si₆O₂₄Cl₂

Mixed tumbled gemstone collection

Varied minerals, likely including amethyst, sodalite/lapis lazuli, quartzite or aventurine, jasper, and agate/chalcedony

Glazed Ceramic Tile

Fused Silicate-Clay composite

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Rhinestone (or glass crystal)

Silicon dioxide (if glass) / Various

Chert (Flint Nodules)

Chert (Silicon Dioxide, SiO2)

Polished green moss agate cabochon

Moss agate: microcrystalline quartz (SiO₂) with included chlorite/actinolite or iron-manganese minerals

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (often called Flint)

Chert (Cryptocrystalline Silica, SiO2)

Pyrite

Iron Sulfide (FeS2)

Petrified Wood

Silicified Wood (SiO2)

Blue calcite (probable)

Calcite, CaCO₃