Sandstone
Arenite
sedimentary
Category
Organic Mineraloid And Mineral
Browse organic mineraloid and mineral specimens identified by the Rock Identifier community.
Learn about Organic Mineraloid And Mineral in the encyclopedia
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Oyster Shell Fragment
Crassostrea virginica (or related Bivalvia)
fossil
Amber
Succinates (fossilized tree resin), approximately C10H16O
organic gemstone
Jasper
Silicon dioxide (SiO2)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in sedimentary/volcanic host
mineral
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Moss Agate
Silicon Dioxide (Chalcedony variety)
mineral
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Hornblende inclusions
mineral
Amber
Succinite (specifically for Baltic amber); Chemical formula approximately C10H16O
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Fossil Coral / Crinoid Stem section
Anthozoa / Crinoidea fossil
fossil
Sandstone with Iron Oxide Concretion
Arenite with Hematite/Goethite Concretion
sedimentary
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcendony replacing organic matter)
sedimentary
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Goethite/Limonite inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (Quartz variety)
gemstone
Tumbled Mixed Gemstones and Rocks
Various mineral species including quartz (SiO2) and silicate minerals
mineral
Quartz (Milky or Yellow/Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Titanium Quartz (Aura Quartz)
Silicon Dioxide (SiO2) treated with Titanium
mineral
Rough Quartz (Milky / Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Gold Nugget / Placer Gold
Native Gold (Au)
mineral
Citrine (Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst and Smoky Quartz (Tumbled)
Silicon Dioxide (SiO2) with trace impurities iron (Amethyst) and aluminum/radiation (Smoky Quartz)
mineral
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite
mineral
Pearl
Calcium carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Amber
Succinite (C10H16O)
mineral
Moss Agate
Silicon Dioxide (Chalcedony with green mineral inclusions), SiO2
gemstone
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Jasper-rich)
Silicon Dioxide (SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite
fossil
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone (Iron-potassium phyllosilicate mineral: (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Chert (variously known as Flint)
Microcrystalline quartz (SiO2)
sedimentary
Fossiliferous Limestone (Coquina)
Calcite (CaCO3) with Bioclastic inclusions
sedimentary