Petrified Wood
Silicified Wood (SiO2)
fossil
Category
Organic Gemstone (Often Associated With Sedimentary Sequences)
Browse organic gemstone (often associated with sedimentary sequences) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Often Associated With Sedimentary Sequences) in the encyclopedia
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Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite in Quartz
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
mineral
Green Jasper
Quartz (Silicon Dioxide, SiO2) with iron silicate inclusions
sedimentary
Agate (Carnelian type)
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Chert (concretionary/nodular variant)
Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions
sedimentary
Petrified Wood with Lichen
Silicified Wood (SiO2) colonized by crustose lichens
fossil
Fuchsite (Chrome Mica)
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Sugilite
KNa2(Fe,Mn,Al)2Li3Si12O30
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Chert (Black Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (fossilized tree resin, C10H16O)
fossil
Milky Quartz with Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Unakite Mushroom Carving
Altered Granite (composed of orthoclase feldspar, green epidote, and quartz)
metamorphic
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Yellow Jasper (Mookaite style)
Silicon Dioxide (SiO2) with Goethite/Hematite inclusions
sedimentary
Chert (specifically Flint or Jasper variant)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chrysoprase
Chalcedony (Silicon Dioxide, SiO2)
gemstone
Siltstone with Quartz Vein
Siltstone (composed of Quartz and Clay minerals) with a hydrothermal Quartz vein (SiO2)
sedimentary
Jasper (Chert / Chalcedony)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Chert (often called Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Galena with Pyrite
Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)
mineral
Menilite Opal (Goddess Stone)
Menilite Opalescent Silex (Amorphous Hydrated Silica)
sedimentary
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Chert (specifically Jasper or Flint variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Honey Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Herkimer Diamond
Quartz (Silica - SiO2)
mineral
Chert (Nodule)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (with Limestone matrix)
Chert (Silica: SiO2)
sedimentary
Chert (often referred to as Flint or Jasper)
Chalcedony (SiO2) - Silicon Dioxide
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Emerald
Beryl (Be3Al2(SiO3)6) colored by Chromium and/or Vanadium
mineral
Jasper
Jasper (Silica-rich microcrystalline Quartz, SiO2 with Fe2O3 impurities)
sedimentary
Amber
Succinite (Fossilized Tree Resin)
gemstone
Amber
Fossilized tree resin (Amorphous organic polymer)
gemstone
Howlite
Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
fossil