Tiffany Stone
Fluorite-bearing Opalized Breccia
Rock/Mineralized Nodule
Category
Biogenic Material
Browse biogenic material specimens identified by the Rock Identifier community.
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Polished kambaba jasper
Orbicular stromatolitic jasper; microcrystalline quartz (SiO₂) with chlorite/amphibole-rich inclusions
sedimentary
Chert (Flint)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Diamond
C
gemstone
Diamond (or Diamond Simulant like Cubic Zirconia)
Carbon (C) - if Diamond; Zirconium dioxide (ZrO2) - if Cubic Zirconia
mineral
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Slag Glass
Silicon dioxide with impurities
mineral
Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert pebble
Microcrystalline silica (SiO2)
sedimentary
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
sedimentary
Mottled gabbro or diorite pebble
Coarse-grained mafic/intermediate intrusive rock; chiefly plagioclase feldspar plus pyroxene, with possible amphibole or biotite
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Basalt (Vesicular)
Extrusive mafic igneous rock; primarily (Mg, Fe)2SiO4 (Olivine), CaAl2Si2O8 (Plagioclase Feldspar), and Pyroxene
igneous
Sandstone Clast
Arenite (primarily SiO2)
sedimentary
River Siltstone / Mudstone Pebble
Siltstone (composed of mixed silicate and carbonate minerals)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Greenschist
Greenschist (chlorite schist)
metamorphic
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Conglomerate
Conglomerate Rock
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Coquina
Bioclastic Limestone (Coquina)
sedimentary
Brick fragment (Man-made material)
N/A (Fired clay)
man-made
Tumbled blue-dyed stone, likely basalt or blue aventurine
Likely fine-grained basalt (plagioclase and pyroxene), possibly coated or dyed; exact identification requires testing
igneous
Slate
Slate (Foliated metamorphic rock)
metamorphic
Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead Fragment)
Cryptocrystalline quartz (SiO2)
sedimentary
Concrete with Exposed Aggregate
Anthropogenic conglomerate (Concrete)
man-made rock (sedimentary analogue)
Diamond (Cut Gemstone)
Carbon (C)
mineral
Diamond (or Diamond Simulant)
C (Carbon) or synthetic equivalent
gemstone
Diamond
C (Carbon)
gemstone
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant
gemstone
Chert or Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Diamond
Diamond (pure carbon, C)
gemstone
Goldstone
Aventurine Glass (Man-made)
mineral
Ferruginous Sandstone (Ironstone Conglomerate fragments)
Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)
sedimentary
Zebra Jasper
Tetragonal Silicon Dioxide (Quartz) with impurities
sedimentary
Schist
Mica schist, likely muscovite–biotite schist with quartz and feldspar
metamorphic