Man Made Material (Jewelry, Metal Alloy)

Chert (Red/Pink Jasper subtype)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2 permineralization)

Petrified Wood

Silicon Dioxide (SiO2) - Calcified / Silicified Wood

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)

Blue Aragonite

Aragonite (Calcium Carbonate, CaCO3)

Chert (Red Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (and Flint variant)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Diamond

C (Native Carbon)

Petrified Wood

Silicified wood (principally SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Rough Diamond

Diamond (C)

Metallic sulfide ore, likely pyrite-bearing rock

Pyrite (FeS₂), possibly with marcasite or other sulfides

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Jasper

Silicon dioxide, SiO2

Amazonite

Microcline Feldspar (KAlSi3O8)

Weathered sandstone or iron-stained siltstone

Quartz-rich clastic sedimentary rock, likely ferruginous sandstone

Petrified Wood

Silicified Wood (SiO2)

Cubic Zirconia (Faceted)

Zirconium dioxide (ZrO2)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Microcrystalline quartz (SiO2)

Amber

Succiniferous organic material (Succinite)

Black Jasper

Silicon Dioxide (SiO2) with impurities

Chert (Jasper)

Cryptocrystalline Quartz (SiO2)

Jadeite

Jadeite (NaAlSi2O6)

Rough Black Diamond (Bort / Carbonado)

Diamond (C)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (Per mineral content: SiO2, Quartz/Chalcedony)

Petrified Wood

Silicified wood (primarily SiO2)

Petrified Wood

Silicified wood (primarily SiO2 - Silicon Dioxide)

Petrified Wood

Silicified Wood (primarily SiO2)

Red Jasper

Silicon Dioxide (SiO2)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Agate (Chalcedony)

Silicon Dioxide (SiO2)

Moss Agate

Chalcedony (Silicon Dioxide - SiO2) with inclusions

Tektite

Natural Impact Glass

Assorted Semi-Precious Gemstone Crosses

Quartz, Silicates, Carbonates (various)

Diamond

Carbon (C)

Diamond (or Simulant)

Carbon (C)

Chert (Flint nodule)

Silicon dioxide (SiO2)

Diamond

Diamond (C)

Chalcedony (Agate/Chert variety)

Silicon Dioxide (SiO2)