Sedimentary Mineral

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Green Chalcedony (likely Green Agate or Chrysoprase)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Orange Calcite

Calcium Carbonate (CaCO3)

Banded Agate / Chalcedony

Silicon Dioxide (SiO2) with trace impurities

Quartz (Milky Variant)

Quartz (Silicon Dioxide, SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Banded Agate (Tumbled)

Agate (Variety of Chalcedony/Quartz), SiO2

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Quartz (Smoky or Clear variety with inclusions)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Chalcedony (specifically Agate or Moonstone-like Quartz)

Silicon Dioxide (SiO2)

Carnelian

Carnelian Agate (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Chalcedony (Agate Nodules)

Silicon Dioxide (SiO2)

Quartz (Milky or Clear variety)

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Chalcedony (Agate/Carnelian type)

Silicon Dioxide (SiO2)

Banded Agate (Orca Agate)

Silicon Dioxide (SiO2) - Chalcedony variety

Carnelian (Carnelian Agate)

Carnelian (Silicon Dioxide - SiO2)

Shungite

Shungite (carbon-rich Precambrian mineraloid)

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Carnelian

Carnelian (SiO2 - Chalcedony colored by Iron Oxide)

Clear Quartz

Silicon Dioxide (SiO2)

Grey Chalcedony

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Pyrite (Fool's Gold) in Matrix

Iron Sulfide (FeS2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Gold

Native Gold (Au)

Banded Gneiss with Quartz Vein

Foliated Metamorphic Rock (Gneiss)

Amber (Copal)

Fossilized Tree Resin (C10H16O)

Hematite

Iron(III) oxide (Fe2O3)

Conglomerate

Clastic sedimentary rock (Puddingstone)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Healer's Gold (Pyrite and Magnetite in Schist)

Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist

Gneiss (Banded Gneiss)

Gneiss

Fossilized Shark Tooth (Cretaceous to Neogene)

Elasmobranchii dental fossil (likely Squalicorax or similar species)

Chert (Flint)

Chert (Microcrystalline or cryptocrystalline Quartz, SiO2)

Kyanite in Quartz

Al2SiO5 in SiO2

Chert (Green variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Yellow Jade (often Serpentine or Dolomite)

Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.

Black Opal

Hydrated Silica (SiO2·nH2O)