Moonstone
Adularia (Potassium Aluminum Silicate, KAlSi3O8)
mineral
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.
Learn about Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material) in the encyclopedia
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Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
gemstone
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood (Silicified Wood)
Silicified Wood / Silicon Dioxide (SiO2)
metamorphic
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Black Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Sandstone (Red / Iron-stained)
Sandstone (composed predominantly of SiO2 with Fe2O3 cement)
sedimentary
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
metamorphic
Ironstone Concretion / Goethite-Hematite Geode
Goethite / Hematite Concretion (Fe3O4 / FeO(OH) / Fe2O3)
sedimentary
Amber
Resinite / Fossilized Tree Resin
mineral
Seashell Fossil
Invertebrate fossil (phylum Mollusca)
fossil
Yellow Agate (Aqeeq / Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Heliotrope (Bloodstone)
Silicon dioxide (SiO2) with inclusions of Hematite or Chlorite
Mineral
Chert (Flint Nodules)
Chert (Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified wood (principally SiO2)
sedimentary
Yellow Sapphire
Corundum (Al2O3)
mineral
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with inclusions of Iron Oxide or Chlorite
mineral
Petrified Wood and Mixed Rocks
Silicified Wood (SiO2)
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Red Jasper with Quartz
Microcrystalline Quartz (SiO2)
sedimentary
Chert Concretion
Microcrystalline Quartz (SiO2)
sedimentary
Opalite
Man-made glass (traditionally simulated Opal)
mineral
Chert (with Quartz Vein)
Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)
sedimentary
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Banded Chert / Sandstone Pebble
Microcrystalline Quartz (SiO2) / Silicified Sandstone
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Amber
Succinite (C10H16O)
mineral
Amber / Copal
Fossilized Tree Resin (Succinate)
Mineraloid
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Pink Dyed Agate Geode Slice
Silicon Dioxide (SiO2) with artificial pigment
mineral
Hagstone (Adder Stone)
Chert or Sedimentary pebble with natural perforation
sedimentary
Fossilized Shark Tooth (Partial) or Coprolite
Elasmobranchii (fossil) or Coprolite (trace fossil)
fossil
Slate
Slate (Metamorphosed Shale or Mudstone)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Graphite
Graphite (Carbon, C)
mineral
Peach Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8) with inclusions
mineral
Jasper (Brown Iron-Rich Variety)
Silicon Dioxide (SiO2) with Fe2O3 (Iron Oxide/Crystalline Quartz)
sedimentary
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary