Mineral And Organic Gemstone

Druzy Chalcedony/Quartz on Fluorite core

Silicon Dioxide (SiO2) on Calcium Fluoride (CaF2)

Diorite

Diorite (Intermediate intrusive igneous rock)

Red Granite

Phaneritic Felsic Igneous Rock

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide

Amber

Succinite

Fossilized Crab Carapace (Concretion)

Decapoda (fossil), typically preserved in calcite or siderite concretion

Moqui Marbles

Iron Oxide Concretion (Hematite/Goethite)

Petrified Wood

Silicified wood (primarily SiO2)

Cubic Zirconia (Faceted)

Zirconium dioxide (ZrO2)

Chert (Chalky/Gray Variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (varietal Flint or Jasper)

Microcrystalline Quartz (SiO2)

Indigo Gabbro

Gabbro (MaFIC intrusive rock)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Tufa (Limestone)

Calcareous Tufa (CaCO3)

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrous Phosphate of Copper and Aluminum)

Chert (Flint/Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (often called Jasper in this color variety)

Microcrystalline Quartz (SiO2)

Chert / Flint

Microcrystalline or cryptocrystalline quartz (SiO2)

Chert (specifically Red Chert/Jasper variety)

Silicon Dioxide (SiO2)

Green Sandstone

Glauconitic Sandstone

Chert (specifically Tan/Yellow Chert)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Fossilized Fish Skeleton in Matrix

Vertebrata (Class: Actinopterygii), typically found in limestone or shale matrices

Petrified Dinosaur Bone (Gembone)

Agatized Dinosaur Bone

Jasper

Silicon dioxide (SiO2)

Petrified Wood

Silicified wood (Quartz, SiO2)

Baroque Pearl

Biogenic Calcium Carbonate (Aragonite/Conchiolin)

Chert with Quartz/Calcite Vein

Microcrystalline Silica (SiO2)

Lepidolite with Rubellite Tourmaline

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite mica)

Amber

Succinite (specifically for Baltic amber); C10H16O (Variable organic compound)

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 principal component)

Chert (Flint Nodules)

Chert (Microcrystalline Quartz, SiO2)

Geode (unopened)

Chert / Chalcedony Geode (SiO2)

Dendritic Agate / Moss Agate

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

Moss Agate

Chalcedony (Silicon Dioxide, SiO2) with dendritic inclusions

Arsenopyrite with Schist Matrix

Arsenopyrite (FeAsS)

Blue Lace Agate

Cryptocrystalline Quartz (SiO2) with trace minerals

Shatter Cone

Impactite (Shatter Cone texture)

Glauconitic Sandstone

Glauconitic Quartz Arenite

Amber

Fossilized Tree Resin (Amorphous Hydrocarbon)

Shungite

Non-crystalline carbon (allotrope of carbon)

Petrified Wood

Silicified wood (Quartz/Chalcedony/Opal replacing organic matter)