Petrified Wood / Fossilized Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Category
Man Made Material (Jewelry, Metal Alloy)
Browse man made material (jewelry, metal alloy) specimens identified by the Rock Identifier community.
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Ruby in Zoisite (Anyolite) or possibly a dyed stone/agate
Anyolite (Ruby in green zoisite) or artificially altered chalcedony
metamorphic
Chert (Flint)
Chert (SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Tumbled white quartz or quartzite pebble
Quartz (SiO₂), possibly massive quartzite
mineral
Diamond (or Diamond Simulant)
C (Carbon) or synthetic equivalent
gemstone
Petrified Wood (Silicified Fossil)
Silicified Wood (SiO2)
sedimentary
Rutilated quartz crystal
Quartz, silicon dioxide (SiO₂), containing rutile inclusions (TiO₂)
mineral
Polished yellow jasper or opaque chalcedony bead
Microcrystalline quartz (SiO₂), likely iron-oxide-stained jasper
mineral
Serpentine
Serpentine Group (Mg3Si2O5(OH)4)
metamorphic
Quartz (Yellow/Citrine variety or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Petrified Coral Fossil
Rugose or Tabulate Coral (Hexagonaria or similar fossilized cnidarian)
fossil
Leopard Skin Jasper
Silicon Dioxide (SiO2) with mineral inclusions
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Red Aventurine / Orange Quartzite
Silicon Dioxide (SiO2) with hematite/goethite inclusions
metamorphic
Sodalite in Feldspar Matrix
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Sunstone
Oligoclase or Andesine (Feldspar Group), (Ca,Na)((Al,Si)4O8)
mineral
Bumblebee Jasper
Calcite-bearing Volcanic Tuff containing Sulfur and Arsenic (Orpiment/Realgar)
sedimentary
Fossilized Sea Urchin (Echinoid)
Echinoidea (Fossil specimen, often replaced by Calcite or Silica)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Crazy Lace Agate
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Septarian Nodule (Dragon Stone)
Septarian Concretion (CaCO3 with Calcite, Aragonite, and Limestone/Bentonite)
sedimentary
Sunstone
Oligoclase (a variety of Plagioclase Feldspar) - (Na,Ca)(Si,Al)4O8
mineral
Biotite on Quartz
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) and Quartz (SiO2)
mineral
Charoite
Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)
mineral
Sunstone (Feldspar)
Plagioclase Feldspar ((Ca, Na)(Al, Si)4O8)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Quartz–mica metamorphic rock, likely schist
Quartz–muscovite/biotite schist; predominantly SiO₂ quartz with phyllosilicate micas
metamorphic
Polished black stone egg, probably black obsidian
Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements
gemstone
Tumbled black-and-white banded stone, likely onyx or agate
Cryptocrystalline quartz (SiO₂), probably banded chalcedony/onyx
mineral
Tumbled banded metamorphic stone
Likely banded gneiss or migmatitic gneiss; exact identification requires testing
metamorphic
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
K2 Stone
Azurite in Granite
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (containing quartz/agate or zeolite fill)
igneous
Quartz (Common or Milky Quartz) with Iron Staining
Silicon Dioxide (SiO2)
mineral
Agate (Carnelian / Fire Agate nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Carnelian / Chalcedony
Silicon Dioxide (SiO2)
mineral
Banded Serpentinite (Beach Pebble)
Serpentine-group silicate rock ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe,Al)2O5(OH)4)
metamorphic
Orbicular Jasper (Ocean Jasper)
Silica-rich Microcrystalline Quartz (SiO2) with various inclusions
sedimentary