Pink Rhodonite
Manganese Silicate (MnSiO3)
mineral
Category
Mineral (Silicate Replaced Organic Material)
Browse mineral (silicate replaced organic material) specimens identified by the Rock Identifier community.
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Greenish translucent mineral fragment
Indeterminate; possibly serpentine, epidote, or green glassy feldspar
mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Chert / Flint
Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂
Mineral
Fossil Shell (Brachiopod or Mollusk)
Phylum Brachiopoda or Class Bivalvia (e.g., Mucrospirifer or similar genus)
fossil
Quartz-rich river pebble (likely milky quartz or quartzite)
Quartz, SiO₂; possibly quartzite, a metamorphic rock dominated by quartz
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossil bivalve shell
Likely fossilized cockle or other marine bivalve; exact genus requires locality and internal features
fossil
Black Onyx and Mother of Pearl
Cryptocrystalline Quartz (SiO2) and Nacre (Calcium Carbonate)
mineral
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Yellow jasper-like chalcedony
Microcrystalline quartz (SiO₂), likely iron-stained jasper or chert
mineral
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Rough White Zircon
Zircon (Zirconium Silicate, ZrSiO4)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert Concretion
Microcrystalline Quartz (SiO2) in Carbonate Matrix
sedimentary
Chert (Light Grey / Flint variant)
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Tourmalinated Quartz
Silicon dioxide (SiO2) with inclusions of Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Chert (Nodule)
Microcrystalline or Cryptocrystalline Silica (SiO2)
sedimentary
Fossilized Shark Tooth or Bone Fragment
Vertebrate Fossil (likely Carcharodon or similar genus)
fossil
Dark brown flint/chert fragment
Microcrystalline quartz (SiO₂), often with minor chalcedony and impurities
sedimentary
Chert (Jasper variety)
Silicon dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Green Jasper (with Quartz veining)
Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite
sedimentary
Petrified Wood (Silicified Wood)
Silicified fossil wood (SiO2)
metamorphic
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Slag (Industrial Byproduct)
Anthropogenic Vitreous Silicate material
igneous
Planet Earth
Gaia (Silicate Terrestrial Planet)
metamorphic
Charoite
Charoite (Complex silicate mineral rock)
metamorphic
Turritella Agate (Fossiliferous Chert)
Silicified Elimia tenera (Fossiliferous Chalcedony)
sedimentary
Fossilized Coral
Anthozoa (Fossilized)
Sedimentary / Fossil
Unidentified small mineral fragments
Likely quartz- or feldspar-rich material; species cannot be determined reliably from the image
mineral
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Green Common Opal
Hydrated Silica (SiO2·nH2O)
mineral
Fossil scallop/bivalve shell
Fossilized pectinid bivalve; likely family Pectinidae (exact genus/species cannot be determined from the image)
fossil