Non Geological

Metaconglomerate

Protolith: Conglomerate (comprising SiO2, Al2O3, etc.)

Chert (and/or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Polished carnelian (red-orange chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), colored by iron oxides

Quartzite

Quartzite (Primary mineral: SiO2)

Blue Slag Glass

Ferro-silicate glass (Slag)

Blue sapphire ring

Corundum, Al₂O₃; blue color typically from trace iron and titanium

Quartzite

Metamorphic Quartzite

Green aventurine bead bracelet

Quartz (SiO₂), typically green aventurine containing fuchsite mica or other chromium-bearing inclusions

Slag Glass

Amorphous Silica Glass (with metal oxide inclusions)

Obsidian

Volcanic Glass (Amorphous silicon dioxide with trace impurities)

Quartzite

Quartzite (primarily SiO2)

Decorative gemstone bracelet or jewelry

Unidentifiable from the blurred image; likely colored glass or synthetic stones, possibly mixed gemstone beads

Obsidian

Obsidian (Volcanic Glass, SiO2)

Grey Quartzite Pebble

Quartzite (primarily SiO2)

Obsidian (Apache Tear)

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)

Rose Quartz

Silicon Dioxide with traces of titanium, iron, or manganese (SiO2)

Green cabochon gemstone, likely nephrite jade

Nephrite jade—interlocking amphibole fibers, chiefly tremolite-actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂

Quartzite

Quartzite (SiO2)

Marble

Recrystallized Calcite (CaCO3)

Snowflake Obsidian

Vitreous Volcanic Rock (Amorphous Silicate), SiO2

Obsidian

Volcanic Glass (SiO2 + impurities)

Tiger’s-eye (likely cabochon gemstone)

Quartz variety, chiefly SiO₂, with fibrous crocidolite-derived inclusions

Fulgarite

Fulgurite (Lechatelierite / Vitrified Sand)

Quartzite

Metamorphic Quartz Rock (SiO2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Polished orbicular granite

Orbicular granite, commonly quartz–feldspar–biotite granite with orbicules

Weathered limestone with possible fossil or calcite coating

Limestone; primarily calcium carbonate (CaCO₃), chiefly calcite

Piddock-bored Mudstone

Lutite (Siltstone or Mudstone) with Pholad borings

Rounded sandstone pebble

Clastic sandstone, predominantly quartz (SiO₂) grains in a cementing matrix

Quartzite

Quartzite (primarily SiO2)

Likely tumbled green aventurine or serpentine

Aventurine quartz (SiO₂ with fuchsite mica) or serpentine-group mineral

Greenschist (likely chlorite schist)

Greenschist-facies metamorphic rock; commonly quartz + chlorite ± actinolite, epidote, albite, and mica

Black Obsidian

Volcanic Glass (felsic)

Shale

Shale (composition varies: primarily clay minerals and quartz)

Black Obsidian

Volcanic Glass (SiO2 + impurities)

Likely blue glass or synthetic gemstone jewelry

Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass

Raw turquoise

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Black Obsidian

Obsidian (Amorphous Silicon Dioxide)

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Quartzite Pebble

Metamorphic Quartzite

Malachite

Copper carbonate hydroxide [Cu2CO3(OH)2]

Small rounded brown stone, likely weathered iron-rich rock

Indeterminate; possibly ferruginous sandstone, ironstone, or weathered basalt