Synthetic Or Natural Fiber

Polished dark stone, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine

Quartz (various varieties)

SiO₂ (Silicon Dioxide)

Quartzite

Quartzite (SiO2)

Tumbled citrine or iron-stained quartz

Quartz (SiO₂), likely iron-oxide-stained or natural citrine

Citrine (Heat-treated or Natural Quartz)

Silicon Dioxide (SiO2)

Chert / Flint

Chert (varieties include Flint)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Baroque Pearl (and potentially a small Sapphire/Blue Topaz)

Pearl: Calcium Carbonate (aragonite or calcite) with conchiolin. Sapphire: Aluminum Oxide (Al2O3). Blue Topaz: Al2SiO4(F,OH)2.

Tumbled smoky quartz (likely iron-stained quartz)

Quartz, silicon dioxide (SiO₂), smoky variety; brown coloration may reflect iron-oxide staining or natural irradiation

Painted River Rock

Painted Quartzite or Smooth Siltstone

Cubic Zirconia (Set in Jewelry)

Zirconium Dioxide (ZrO2)

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Silicon Carbide (Carborundum)

Moissanite (SiC)

Bismuth

Bismuth (Bi)

Silicon

Element Si

Cubic Zirconia (Faceted)

Zirconium dioxide (ZrO2)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Cubic Zirconia (Simulated Diamond)

Zirconium dioxide (ZrO2)

Jasper (likely red/brown jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides

Bismuth Crystal

Bismuth (element symbol Bi, atomic number 83)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)

Tumbled chalcedony or quartz

Microcrystalline silica, SiO₂ (likely chalcedony; possibly milky quartz)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)

Tiger\'s Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Red Agate (Carnelian)

Silicon Dioxide (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with Iron Oxide inclusions)

Cubic Zirconia (Simulated Diamond)

Zirconium Dioxide (ZrO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Silicon

Element Si

Tiger’s eye

Quartz variety, primarily silicon dioxide (SiO₂); fibrous quartz pseudomorph after crocidolite asbestos

Blue Goldstone

Man-made glass with crystalline copper/cobalt inclusions

Tiger's Eye (likely variant or dark tumble)

Pseudomorph of Quartz after Crocidolite (SiO2)

Magnetite or Hematite-rich Ore

Magnetite (Fe3O4) or Hematite (Fe2O3)

Carborundum (Silicon Carbide)

Silicon carbide (SiC)

Red Tiger's Eye

Silicified Crocidolite (SiO2 with iron oxide inclusions)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide)

Soapstone (steatite), possibly talc-rich schist

Steatite; predominantly talc, Mg₃Si₄O₁₀(OH)₂, with possible chlorite, mica, and carbonates

Cubic Zirconia

Cubic Zirconium Dioxide (ZrO2)

Gray chalcedony (microcrystalline quartz)

Chalcedony, SiO₂; likely common gray/blue-gray variety

Likely blue-gray stone, possibly slate or basalt

Indeterminate; candidates include slate (fine-grained metamorphic rock) or basalt (mafic igneous rock)

Red Tiger Eye (or Polished Jasper Gneiss)

Silicon dioxide with crocidolite inclusions (SiO2)

Tumbled chalcedony (likely agate or jasper)

Microcrystalline quartz, SiO₂ (chalcedony)