Ironstone Concretion (Moqui Marble / Boji Stone)
Sedimentary Iron Oxide Concretion (Fe2O3 / FeO(OH))
sedimentary
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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Jasper with Quartz Vein
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Blue Apatite
Calcium phosphate mineral, Ca5(PO4)3(F,Cl,OH)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
Mineral
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Likely dark green-gray metamorphic pebble
Indeterminate; possibly chlorite schist, serpentinite, or amphibolite
metamorphic
Shale
Mudrock / Fissile Shale
sedimentary
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
sedimentary
Dinosaur Bone
Agatized Dinosaur Bone
sedimentary/fossil
Ironstone Concretion (Iron-rich Mudstone)
Siderite / Geothite concretion (FeCO3 / FeO(OH))
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
![Turquoise (Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]) — mineral](https://media.rockidentification.com/bd94961c-533a-4ed4-b8e1-773f9b478c18-thumbnail.jpg)
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
mineral
Mottled gabbro or diorite pebble
Coarse-grained mafic/intermediate intrusive rock; chiefly plagioclase feldspar plus pyroxene, with possible amphibole or biotite
igneous
Boulder Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Chalcedony on Matrix
Silicon Dioxide (SiO2)
mineral
Clear quartz crystal fragment
Quartz, silicon dioxide (SiO₂)
mineral
Chert / Flint
Chert (Silicon Dioxide, SiO2)
sedimentary
Fossiliferous Sandstone / Fossil Fragment
Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material
fossil
Sunstone
Oligoclase or Andesine (Plagioclase Feldspar) - (Ca, Na)((Al, Si)2Si2O8)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossil Shark Tooth
Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite
fossil
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Jasper
Jasper (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) fossil
fossil
Amber
Succinate (Fossilized Tree Resin)
gemstone
Amber / Fossilized Resin
Succinite / Fossilized Tree Resin
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossiliferous Siltstone
Clastic Sedimentary Rock with Fossil Inclusions
sedimentary
Travertine (Tufa)
Chemical Sedimentary Rock / Travertine (CaCO3)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
metamorphic
Yellow Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Rounded river cobble, likely basaltic volcanic rock
Fine-grained mafic igneous rock; likely basalt or andesite
igneous
Chert (variations include Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Chert (includes Flint & Jasper)
Chert (Siliceous sedimentary rock, chemical formula SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary