Petrified Wood
Silicified Wood (SiO2)
sedimentary
Category
Organic Gemstone (Sedimentary Classification)
Browse organic gemstone (sedimentary classification) specimens identified by the Rock Identifier community.
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Baltic Amber
Succinite (Polmerized conifer resin)
mineraloid
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Chert (Common Opal/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Dendritic Opal (Common Opal)
Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (Flint Pebbles)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Kyanite
Kyanite (Al2SiO5)
mineral
Chert (specifically a stream-worn Chert Nodule)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper (Mookaite variety likely)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Banded Chert (Ironstone/Jasper)
Cryptocrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Septarian Nodule (Dragon Stone)
Septarian Concretion (CaCO3 with Siderite and Calcite)
sedimentary
Chert (variations include Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Septarian Nodule or Mud Crack Fossil
Septarian Nodule (Concretion)
sedimentary
Septarian Nodule (Dragon Stone)
Septarian Geode (CaCO3 + Mg + Fe)
sedimentary
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Tufa (Calcareous Tufa)
Calcareous Tufa (CaCO3)
sedimentary
Chert (Brecciated or Veined)
Silicon Dioxide (SiO2)
sedimentary
Amethyst Geode
Amethyst/Purple Quartz (SiO2)
mineral
Carnelian and White Quartz Bracelet
Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Wood / Chalcedony (SiO2)
sedimentary
Chert (Flint)
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Amber
Succinite (fossilized tree resin)
mineraloid / sedimentary organic material
Anthracite Coal
Anthracite
metamorphic
Red Jasper
Jasper (Silicon Dioxide with Hematite inclusions), SiO2
sedimentary
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Garnet (likely Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Quartz (Pale Rose or Milky Variety)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2) with iron inclusions
sedimentary
Rhodochrosite
Rhodochrosite, Manganese Carbonate (MnCO3)
mineral
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz (Small Grains)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Jasper (SiO2) with iron hydroxide inclusions
sedimentary
Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Graphite
Graphite (Native Carbon, C)
metamorphic