Petrified Wood
Silicified wood (SiO2)
fossil
Category
Organic Materia (Not A Rock Or Mineral)
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Petrified Wood
Silicified wood (SiO2 - Silicon Dioxide)
sedimentary
Petrified Wood
Silicified wood (Quartz variant, SiO2)
sedimentary
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Likely weathered gneiss
Foliated metamorphic rock, commonly quartz–feldspar–mica gneiss
metamorphic
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary or volcanic shell
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock
igneous
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Chert (often called Flint)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Sandstone Pebble
Sandstone (Silicon dioxide-rich clastic sedimentary rock)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (Carbon-based organic compound; approximate formula C10H16O)
Mineraloid
Sandstone with Desert Varnish
Arenite (SiO2 predominantly) with Ferromanganese coating
sedimentary
Sandstone
Arenite (primary component SiO2)
sedimentary
Orange Quartz (or Carnelian Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz cluster, possibly druzy quartz on matrix
Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Amber
Resinite (Succinite if from the Baltic); Chemical Formula: C10H16O (approximate)
Organic Diamond/Gemstone (often associated with Sedimentary sequences)
Granite
Felsic intrusive igneous rock
igneous
Coarse Sand or Fine Gravel
Detrital Sedimentary Fragments (mostly SiO2)
sedimentary
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Granite
Felsic intrusive igneous rock
igneous
Druzy Quartz on Chert/Siltstone
Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Granite
Felsic intrusive igneous rock
igneous
Chert (often associated with Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Chert (Flint variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (and/or River Pebble)
Microcrystalline quartz (SiO2)
sedimentary
Bivalve Fossil (Brachiopod or Scallop)
Class Bivalvia (or potentially Phylum Brachiopoda)
fossil
Moqui Marble (Shaman Stone)
Ironstone Concretion (Goethite/Hematite Shell)
sedimentary
Chert (Yellow and Red Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone (Concretionary or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Granite
Intrusive Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Banded Greywacke
Greywacke (Lithic wacke)
sedimentary
Granite
Plutonic felsic rock (Quartz, Feldspar, Mica)
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
metamorphic
Agated Chert
Microcrystalline Quartz (SiO2)
sedimentary