Petrified Wood
Agatized or Silicified Wood (SiO2)
fossil
Category
Not A Rock (Synthetic Material)
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Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Fossilized wood (petrified wood)
Silicified wood; commonly quartz/chalcedony (SiO₂) replacing wood tissue
fossil
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Boulder Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Polished ocean jasper (orbicular jasper)
Microcrystalline quartz/chalcedony with iron- and manganese-bearing inclusions; SiO₂
mineral
Granite
Phaneritic Igneous Rock
igneous
Brecciated jasper/chert
Microcrystalline quartz (SiO₂), with iron-oxide and clay inclusions
sedimentary
Quartz-veined metamorphic rock, likely quartzite or schist
Quartz-rich metamorphic rock with a milky-quartz vein; exact host rock is indeterminate from the photo
metamorphic
Turquoise jewelry beads/earrings
Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly reconstructed or imitation turquoise
gemstone
Likely chert/flint fragment
Microcrystalline quartz (SiO₂), possibly partially weathered chert
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Quartz-rich chalcedony (likely jasper or agate)
Microcrystalline quartz, SiO₂; fibrous chalcedony with iron-oxide inclusions
mineral
Orbicular rhyolite (orbicular jasper-like volcanic rock)
Silica-rich rhyolite containing concentric feldspar–quartz orbicules, commonly with iron-oxide staining
igneous
Weathered basalt or other dark volcanic rock
Likely basalt; predominantly plagioclase feldspar and pyroxene, possibly olivine and iron oxides
igneous
Honey calcite (likely rough cleavage fragment)
Calcite, calcium carbonate (CaCO₃)
mineral
Rhyolitic Tuff
Rhyolitic Tuff / Pyroclastic rock
igneous
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Sandstone
Arenite (predominantly SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Siltstone Pebble
Siltstone (composed of siliciclastic grains)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Fossiliferous Sandstone / Fossil Fragment
Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material
fossil
Raw Agate (Rough Lake Superior Agate or Jasper-Chalcedony Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Sandstone (Limonitic/Iron-stained)
Sandstone (containing Quartz, SiO2, and Limonite, FeO(OH)·nH2O)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite / Arkosic Sandstone (Coarse Igneous or Sedimentary Aggregate)
Granite / Quartz-Feldspar Aggregate
igneous
Sandstone (with iron staining)
Quartz Arenite / Ferruginous Sandstone
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Green Quartzite / Quartz Pebble
SiO2 (Silicon Dioxide with inclusions)
metamorphic
Lazulite Quartzite
Quartzite with Lazulite (SiO2 with (Mg,Fe)Al2(PO4)2(OH)2)
metamorphic
Jasper and Epidote in Quartzite
Metamorphic rock containing microcrystalline quartz, epidote, and jasper
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary