Synthetic Or Natural Fiber

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)

Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.

Citrine

Quartz (SiO₂)

Green Agate

Silicon dioxide (SiO₂)

Black Tourmaline

Schorl (Na(Fe2+)_{3}Al_{6} (BO_{3})_{3} (Si_{6}O_{18})(OH)_{4})

Aventurine (likely Green Aventurine)

Silicon Dioxide (SiO2) with various inclusions

Smoky Quartz

SiO2 (Silicon Dioxide)

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

River Cobble (likely Sandstone or Siltstone type)

Sandstone or Siltstone (common rock types that form river cobbles)

Peridot (Olivine)

Olivine, (Mg,Fe)2SiO4

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Sandstone

Sandstone (composed primarily of sand-sized minerals or rock grains)

Blue Goldstone

Goldstone (artificial glass)

Aquamarine

Beryl (Be₃Al₂Si₆O₁₈), specifically a blue or cyan variety

Sandstone

Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)

Diamond

Carbon (C), specifically a solid form of the element carbon with atoms arranged in a crystal structure called diamond cubic.

Smoky Quartz

SiO2 (Silicon Dioxide)

Pearls

Aragonite (calcium carbonate) and Conchiolin

Emerald

Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Sandstone

Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)

Shale

Shale (clastic sedimentary rock)

Agate

Agate (a cryptocrystalline variety of Quartz, SiO₂)

Smoky Quartz

SiO2 (Silicon Dioxide)

Rutilated Quartz (likely Citrine or Smoky Quartz with Rutile inclusions)

SiO2 with TiO2 inclusions (Quartz with Rutile)

Rose Quartz (likely carved)

Rose Quartz (SiO2)

Sandstone

Sandstone (lithified arenite/wacke)

Coquina

Coquina (a type of limestone)

Carved Mottled Greenish-Yellow Crystal/Glass Object

Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Black Tourmaline (Schorl)

Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3)(OH)3(OH))

Topaz

Topaz (Al2SiO4(F,OH)2)

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)

Brick

Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)

Bi-Color Tourmaline (or Watermelon Tourmaline)

Tourmaline (complex borosilicate mineral group with general formula AD3G6(BO3)3T6O18(OH,O)4)

Shale or Argillite

Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)

Diamond

Diamond (pure carbon, C)

Gold

Aurum (Au)

Amethyst

SiO2 (Silicon Dioxide) - a variety of Quartz

Halite

Halite (Sodium Chloride - NaCl)

Sandstone

Sandstone (Clastic Sedimentary Rock)

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide with Iron and Titanium impurities)