Bivalve Fossil (Internal Mold/Steinkern)
Class Bivalvia (Fossilized Mold)
sedimentary
Category
Mineral And Organic Gemstone
Browse mineral and organic gemstone specimens identified by the Rock Identifier community.
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Pyrite in Shaly Matrix
Iron Sulfide (FeS2)
mineral
Emerald in Host Rock
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Citrine
SiO2 (Silicon Dioxide)
mineral
Xenolith in Basalt
Mafic Igneous Rock with Felsic Inclusion
igneous
Fish Fossil in Limestone
Lycoptera (likely) in Micritic Limestone
sedimentary
Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Chert (Yellow/Brown Jasper)
Silicon Dioxide (SiO2)
sedimentary
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxide
mineral
Moss Agate
Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions
mineral
Amber
Succinite (Fossilized Tree Resin) - C10H16O
mineral
Fossil Shark Tooth
Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite
fossil
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Amber
Amber (C10H16O)
mineral
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
Mineral
Chert (often referred to as Flint or Jasper)
Chalcedony (SiO2) - Silicon Dioxide
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variant)
Microcrystalline quartz (SiO2)
sedimentary
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Serpentinite
Serpentine rock (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4
metamorphic
Eudialyte in Matrix
Eudialyte (Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2)
mineral
Amazonite
Amazonite (KAlSi3O8 – a variety of Microcline, a Potassium Feldspar)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead/Artifact Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Polished/Tumbled)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (fossilized resin)
mineraloid
Quartzite river stone
Quartzite (SiO2)
metamorphic
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Iron Slag
Anthropogenic Ferro-silicate
mineral
Quartz (Milky/Gray variety)
Silicon Dioxide (SiO2)
mineral
Hematite (Tumbled)
Iron(III) oxide (Fe2O3)
mineral
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe oxides)
mineral
Pink Opal
Hydrated Silica (SiO2·nH2O)
mineral
Amber
Succinite (fossilized tree resin)
mineral
Moss Agate with Quartz Druzy
Chalcedony with inclusions (SiO2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Fe/Mg/Mn/Chlorite)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Mosasaur Tooth Fossil
Mosasaurid vertebrate fossil (Hydroxyapatite)
mineral