Petrified Coral Fossil
Rugose or Tabulate Coral (Hexagonaria or similar fossilized cnidarian)
fossil
Category
Mineraloid Like Synthetic Material
Browse mineraloid like synthetic material specimens identified by the Rock Identifier community.
Learn about Mineraloid Like Synthetic Material in the encyclopedia
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Schist
Mica Schist
metamorphic
Amethyst-bearing quartz (likely polished or naturally fractured)
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron-related defects
mineral
Tumbled amethyst
Quartz, purple variety; silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation
mineral
Small purple quartz crystal, likely amethyst
Amethyst: violet variety of quartz, silicon dioxide (SiO₂)
gemstone
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Jasper or Flint in this color variety)
Silicon Dioxide (SiO2)
sedimentary
Chert / Microcrystalline Quartz
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone with Vitrinite/Coal inclusions
Arenite with Carbonaceous inclusions
sedimentary
Moss Agate (Crescent Moon Shape)
Silicon Dioxide (SiO2) with iron/manganese inclusions
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Amber
Fossilized tree resin (Amorphous)
gemstone
Synthetic Zinc/Polycarbonate Composite (Bey-specimen)
Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay
Anthropogenic Mineral Mimic
Schist
Mica Schist
metamorphic
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)
gemstone
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Flint (Chert)
Cryptocrystalline Quartz (SiO2)
sedimentary
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Siltstone
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Sandstone
Arenite (primarily composed of SiO2)
sedimentary
Mica Schist
Schist
metamorphic
Sandstone
Arenite (typically SiO2 based)
sedimentary
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone or Brick Fragment
Arenite (if sandstone)
sedimentary
Bumblebee Jasper
Calcite-bearing Volcanic Tuff containing Sulfur and Arsenic (Orpiment/Realgar)
sedimentary
Brown Quartz (Jasper or Chert)
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Yellow Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Concrete / Conglomerate (Man-made)
Artificial Conglomerate (Cementitious Composite)
sedimentary
Sandstone
Arenite
sedimentary
Black Onyx and Mother of Pearl
Cryptocrystalline Quartz (SiO2) and Nacre (Calcium Carbonate)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Diamond (Heart Cut)
Carbon (C)
gemstone
Sapphire
Corundum (Al2O3)
mineral
Chert (Grey-Green Var.)
Silicon Dioxide (SiO2)
sedimentary
Slag (Industrial Glass/Glassy Rock)
Anthropogenic Vitreous Material
igneous