Manufactured Glass

Red vesicular volcanic rock, likely scoria

Scoria (mafic volcanic rock; commonly basaltic, composed mainly of plagioclase, pyroxene, and iron-rich glass)

Polished reddish-brown stone bead, possibly jasper

Likely iron-rich microcrystalline quartz (jasper; SiO₂), but the image is not sufficient for a confident identification

Tumbled white stone beads, likely marble or quartz

Undetermined; possibly marble (recrystallized calcite, CaCO₃) or milky quartz (SiO₂)

Slag (Industrial Glass Slag)

Amorphous Silica / Ferro-silicate Slag

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Man-made)

Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)

Amorphous Silicon Dioxide (SiO2) with chemical additives (e.g., Cobalt for blue color)

Quartz Pebble

Silicon Dioxide (SiO2)

Multi-stone gemstone ring

Likely faceted blue topaz or synthetic blue stone with clear stones, possibly cubic zirconia or diamond; metal setting appears silver-colored alloy

Stainless Steel Spoon

Iron-Chromium Alloy (Fe + Cr + Ni)

Note: This is a Man-Made Object (Costume/Prop Patch)

Synthetic fiber and pigments (Cellulose/Plastic-based composite)

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Quartz

Silicon Dioxide (SiO2)

Quartz (Pale Rose or Milky Variety)

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphic rock predominantly composed of Quartz (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Imitation or Cultured Pearl Earrings

Calcium carbonate (CaCO3) or synthetic polymer/glass

Blue Slag Glass

Man-made Silicon Dioxide (Amorphous)

Slag Glass (Cullet Glass)

Amorphous Silica (Industrial byproduct)

Clear Quartz

Silicon Dioxide (SiO2)

Opalite

Synthetic Silicon Dioxide (SiO2)

Lapidary Wax (imitation/wax model)

Hydrocarbon wax blend with colorant (imitating Lapis Lazuli/Emerald)

Chert (specifically varieties like Chalcedony or Flint)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Smoky Quartz with Feldspar

Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Quartz-bearing granite or gneiss fragment

Granite/gneiss composed mainly of quartz (SiO₂), feldspar, and minor mica or ferromagnesian minerals

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Snow)

Silicon Dioxide (SiO2)

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Spherical sandstone concretion

Sandstone concretion, commonly quartz-rich arenite cemented by calcite, silica, or iron oxides

Chalcedony (likely carnelian/agate beads or rounded grains)

Microcrystalline quartz, SiO₂; chalcedony varieties

Weathered gray metamorphic rock, likely slate or phyllite

Foliated metapelite; commonly muscovite–quartz–chlorite, possibly with iron-oxide staining

Quartz with Matrix

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Quartzite / Iron-stained Quartz)

Silicon Dioxide (SiO2)

Sandstone

Arenite

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)