Petrified Wood
Silicified Wood (SiO2)
sedimentary
Category
Organic Materia (Not A Rock Or Mineral)
Browse organic materia (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Organic Materia (Not A Rock Or Mineral) in the encyclopedia
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Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Unable to identify - Image contains non-geological items
N/A
Quartz Vein in Host Rock
Hydrothermal Quartz (SiO2) in Slates/Schists
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Hag Stone
Perforated sedimentary rock (typically sandstone or limestone)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Jasper
Silicon dioxide (SiO2)
mineral
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood (SiO2)
sedimentary
Septarian Nodule
Septarian Concretion
sedimentary
Chert (Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Silica (SiO2)
sedimentary
Chert (specifically Gray Chert/Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinrite (Organic Gemstone)
mineraloid
Brachiopod Fossil
Phylum Brachiopoda
fossil
Conglomerate (or Breccia / Porphyry)
Clastic Sedimentary Rock (Conglomerate / Sandstone)
sedimentary
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
sedimentary
Chert (varietal known as Jasper or Flint)
Silicon Dioxide (SiO2)
Sedimentary Rock
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Agate (Yellow Moss Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Pink Opal
Hydrated silicon dioxide (SiO2·nH2O) with inclusions
mineral
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Quartz Vein in Hematitic Siltstone
Hydrothermal Quartz (SiO2) in Ferriferous Matrix
metamorphic
Wishing Rock (Quartz Vein in Host Rock)
Silicon dioxide (SiO2) vein in various host rocks
Igneous/Sedimentary/Metamorphic with Mineral Vein
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Unakite
Epidotized Granite
metamorphic
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Fancy Jasper
Silicon Dioxide (SiO2) with iron and organic inclusions
sedimentary
Granite / Quartzite Specimen
Granite / Quartz (SiO2 with Feldspar and Mica)
igneous
Granite
Intrusive igneous rock
igneous
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2) with various iron-oxide inclusions
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Vein in Siltstone
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
metamorphic
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Greywacke (likely)
Greywacke (a type of sandstone)
Sedimentary