Man Made Material (Jewelry, Metal Alloy)

Banded Calcite (often sold as 'Mexican Onyx')

Calcite (Calcium Carbonate, CaCO3)

Red Jasper

Silicon dioxide (SiO2) with iron oxide (Fe2O3) inclusions

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Tiger's Eye (Multicolor/Variegated)

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxides)

Jasper

Jasper (Silicon Dioxide, SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Jasper

Jasper (Silicon Dioxide) - SiO2

Precious Opal

Hydrated Silica (SiO2·nH2O)

Diamond (Princess Cut)

Carbon (C)

Tiger's Eye

Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2

Jasper (yellow/cream variety)

SiO₂ (Cryptocrystalline Quartz)

Petrified Wood

Silicified Wood (SiO2)

Diamond (or Cubic Zirconia imitation)

Carbon (C) - Native Element

Chert (specifically Jasper or Brown Chert node)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Leopard Skin Jasper

Orbicular Rhyolite (Silicon Dioxide with various impurities)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood (SiO2 - Silicon Dioxide)

Chert (specifically Red Chert / Flint)

Silicon Dioxide (SiO2)

Lapis Lazuli

Complex metamorphic rock consisting mainly of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite

Lapis Lazuli

Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)

Petrified Wood

Silicified Wood (SiO2)

Dyed Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Blue Quartzite

Quartzite (primarily SiO2) with inclusions like Dumortierite or Crocidolite

Yellow Quartz (Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Herkimer Diamond

Quartz (SiO2)

Chert (varietal Flint)

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variant Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Pink/Red variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions

Chiastolite (Andalusite)

Al2SiO5

Blue Kyanite

Kyanite (Al2SiO5)

Milky Quartz

Silicon Dioxide (SiO2)

Coral Fossil (Petrified Coral)

Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)

Chalcedony (Agate/Chert)

Microcrystalline Quartz (SiO2)

Dragon Blood Jasper

Epidote-rich Quartzite (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chrysocolla Chalcedony

Hydrated Copper Phyllosilicate (Cu,Al)2H2Si2O5(OH)4 + SiO2

Red Jasper

Quartz (Silicon Dioxide) with Iron Oxide impurities (Fe2O3)