Man Made Glass

Eroded Brick or Pumice-like Scoria

Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)

Possible yellow agate or chalcedony bead

Microcrystalline quartz (SiO₂), likely chalcedony; identification is uncertain from the photo

Iron-stained quartz-rich rock, possibly jasper or chert

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides

Sandstone

Arenite (composed primarily of SiO2)

Mixed beach-stone and tumbled-glass collection

Predominantly uncertain rocks (likely basalt, granite, and quartz-bearing stones) with anthropogenic glass; one possible banded agate or jasper

Tektite

Natural impact glass

Chert (with nodule)

Microcrystalline Quartz (SiO2)

Yellow chalcedony (likely lemon agate or yellow jasper)

Microcrystalline quartz, SiO₂; possibly iron-bearing jasper or chrysoprase-like chalcedony

Amber-set ring

Amber (fossilized plant resin; organic mineraloid), set in a metal ring

Diamond

C (Pure Carbon)

Chert / Flint

Silicon Dioxide (SiO2)

Diamond-set gold ring

Diamond (carbon, C) in a gold alloy setting; the clear center stone may be a diamond or a diamond simulant

Pink Granite

Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)

Sandstone

Arenite (mostly SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Polished smoky quartz crystal point

Quartz (SiO₂), likely iron-colored or smoky quartz with milky inclusions

Corundum (Sapphire variant)

Aluminium oxide (Al2O3)

Red Quartzite

Quartzite (Metamorphic quartz sandstone)

Sandstone

Arenite (specifically sublithic or quartz arenite)

Chert

Microcrystalline quartz (SiO2)

Chert

Microcrystalline quartz (SiO2)

Decorative gemstone-chip jewelry (likely turquoise, coral, and assorted beads)

Predominantly turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; other pieces appear to be dyed coral or red stone, and possibly shell/metal components

Amethyst

Amethyst (Silicon Dioxide - SiO2 with Iron impurities)

Diamond

Carbon (C)

Chalcedony with iron-oxide staining

Microcrystalline quartz (SiO₂), likely chalcedony or chert with limonite/goethite staining

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Black Chert or Flint)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (Metamorphic Quartz Sandstone)

Weathered iron-rich rock, possibly jasper or ironstone

Likely limonite/goethite-bearing siliceous rock; exact identification requires hardness and streak tests

Chert / Flint

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite

Sandstone (likely Quartzose Sandstone)

Arenite

Sandstone

Arenite

Amethyst crystal fragment

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron and irradiation

Multicolor quartz bead bracelet

Quartz (silicon dioxide, SiO₂); bead colors may be from different varieties or treated quartz

Flint / Chert

Microcrystalline quartz (SiO2)

Chert (often called Flint)

Chert (SiO2)

Sandstone (Quartzose)

Sandstone (SiO2 dominated)

Chert (variations include Flint/Novaculite)

Chert (formula: SiO2)

Beach Pebble (Chalcedony / Chert)

Silicon Dioxide (SiO2)

Gemstone cocktail ring, likely jade and quartz or glass beads

Possible jadeite (NaAlSi₂O₆) or nephrite (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); the peach-colored beads cannot be reliably identified from the image