Amber
Succinite (fossilized resin)
mineraloid
Category
Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material)
Browse organic gemstone (not a rock or mineral in the traditional sense, but bio mineralized material) specimens identified by the Rock Identifier community.
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Quartz Druzy on Matrix (likely Agate or Jasper)
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Chert (and its variety Flint)
Silicon dioxide (SiO2) / Microcrystalline quartz
sedimentary
Diamond (or Diamond Simulant)
Carbon (C) - Native Element
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Sandstone
Arenite (primarily composed of SiO2)
sedimentary
Chert (Holey Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Chert (Septarian or Nodular variety)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO₂ / Silicon Dioxide)
mineral
Rough Quartz (or Quartzite pebble)
Silicon Dioxide (SiO2)
mineral
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Limonite-stained Chert
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
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.
Mineral, often a rock given its aggregate nature
Pearl
Calcium Carbonate (Aragonite) - CaCO3
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Petrified Wood (Silicified Wood)
Silicified Wood / Silicon Dioxide (SiO2)
metamorphic
Moonstone
Orthoclase (KAlSi3O8), specifically the variety showing adularescence
mineral
Metal Alloy (Jewelry)
Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.
Man-made Material (jewelry, metal alloy)
Rose Quartz (or Quartzite)
Silicon Dioxide (SiO2)
mineral
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Tiger's Eye
Titanium-containing Quartz (Silica: SiO2)
Mineral
Pearl (as a Biogenic Mineral)
Calcium Carbonate (mostly Aragonite) with Conchiolin; CaCO3
mineral
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
metamorphic
Pearl
Calcium carbonate (CaCO3) - mainly Aragonite
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Angelite
Anhydrite (Calcium Sulfate, CaSO4)
mineral
Chert (with Quartz Vein)
Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)
sedimentary
Turquoise, Pearl, and Coral Necklace
CuAl6(PO4)4(OH)8·4H2O (Turquoise) / CaCO3 (Pearl and Coral)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Sandstone (likely Fossilized Wood or Concrete Simulacrum)
Arenite / Silicified Wood / Anthropogenic Concrete
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Garnet (likely Almandine or Pyrope)
Garnet Group (Fe3Al2Si3O12 or Mg3Al2Si3O12)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Smoky Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Note: No specimen visible
N/A
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Coral Fossil (Petrified Coral)
Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)
sedimentary