Man Made Silicate (Anthropogenic Glass)

Conglomeratic gravel / polymictic breccia

Polymictic rudite, likely anthropogenic or beach/stream gravel; composition varies

White drusy quartz

Quartz, silicon dioxide (SiO₂), with a drusy coating of tiny crystals

Blue Goldstone

Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)

Faceted colorless gemstone, likely quartz or glass imitation

Most likely quartz (SiO₂), though the strong glare and visible facet pattern could indicate cubic zirconia or lead glass

Goldstone and pink quartz bead strands

Goldstone is aventurescent copper-bearing glass; pink beads are likely rose quartz (SiO₂), though dyed or glass imitations are possible

Quartz Pebble

Silicon Dioxide (SiO2)

Obsidian Arrowhead

Volcanic Glass (Primary composition: SiO2)

Jasper

Jasper (Silicate - SiO2)

Blue glassy cabochon, likely blue quartz or synthetic glass

Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive

Obsidian

Obsidian (Volcanic Glass, complex silicate)

Chert (specifically Tan/Gray Chert)

Microcrystalline quartz (SiO2)

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Flint (gray chert)

Microcrystalline quartz (SiO₂), a variety of chert

Feldspar (specifically Orthoclase or Plagioclase)

Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate

Nickel coin (U.S. currency)

Cupronickel (75% Copper, 25% Nickel alloy)

Black Obsidian

Volcanic glass (Amorphous silicates)

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Jasper (Liver Jasper or Chocolate Jasper)

Jasper (Silicate - SiO2)

Polished black stone, likely basalt or black jasper

Indeterminate; possible fine-grained basalt (plagioclase–pyroxene) or black jasper/microcrystalline quartz

Likely polished/tumbled dark mineral or glassy rock fragment

Indeterminate from image; possibly hornblende, schorl tourmaline, or obsidian

Polished, carved gemstone (possibly dyed agate or glass-like material)

Unconfirmed from the image; no specific mineral can be identified reliably

Red glass-like crystal, likely synthetic ruby or red glass

Uncertain from image; possible corundum (ruby), Al₂O₃, or synthetic glass

Red agate bead (likely dyed or treated)

Agate, a microcrystalline variety of quartz; SiO₂

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide)

Likely tumbled quartz or feldspar fragment

Quartz (SiO₂) or feldspar-group silicate

Feldspar (likely Amazonite or Plagioclase)

Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate

Pearl (with Peridot)

Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4

Colorless faceted gemstone, likely quartz

Quartz (SiO₂), tentative identification; the photo is insufficient to confirm the material

Mahogany Obsidian

Volcanic Glass (Silicate: SiO2 + Fe2O3)

Blue glass-like heart pendant, likely synthetic blue spinel or colored glass

Unconfirmed; possibly synthetic spinel (MgAl₂O₄) or cobalt-colored glass

Botryoidal Chalcedony (Agate)

Silicon Dioxide (SiO2)

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Green Aventurine

Silicon Dioxide (SiO2+KAl2(AlSi3O10)(OH)2)

Moonstone (specifically White Moonstone or Girasol Quartz)

Potassium aluminum silicate (KAlSi3O8)

Cullet Glass (Strawberry Glass)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Snowflake Obsidian

Spherulitic Obsidian (Amorphous Volcanic Glass with Cristobalite inclusions)

Quartz Pebble

Silicon Dioxide (SiO2)

Obsidian

Volcanic glass (SiO2)

K-Feldspar (Potassium Feldspar / Pink Feldspar)

KAlSi3O8 (Potassium Aluminum Silicate)

Small pink mineral fragment

Indeterminate; possibly rose quartz or feldspar

Chert (Flint)

Silicon dioxide (SiO2)