Blue Chalcedony (likely dyed)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Category
Man Made Object (Ring)
Browse man made object (ring) specimens identified by the Rock Identifier community.
Moonstone
Orthoclase (Potassium aluminum silicate - KAlSi3O8)
mineral
Garnet (likely Almandine or Pyrope)
Garnet Group (Fe3Al2Si3O12 or Mg3Al2Si3O12)
mineral
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Sandstone (Wonderstone)
Silicified Sandstone / Orthoquartzite with Liesegang rings
sedimentary
Smurf Rock (Fictional Interpretation)
Cyanus Anthropomorphicus (Geologic Simulation)
Artificial/Fantasy Object
Sandstone with Liesegang Rings
Arenite with Iron Oxide Concretions
sedimentary
Sandstone with Liesegang Rings
Arenite with secondary Iron oxide (Limonite/Goethite) precipitation
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock: Arenite
sedimentary
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)
Malachite
Malachite (Cu2(CO3)(OH)2 - a copper carbonate hydroxide mineral)
Mineral
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary
Sandstone (with banding)
Arenite (primarily SiO2)
sedimentary
Druzy Quartz Geode (Oco or Moroccan variety)
Silicon Dioxide (SiO2)
mineral
Carnelian
Carnelian (Microcrystalline Quartz, SiO2 with Fe2O3 impurities)
Mineral
Fossil Coral (Rugose Coral)
Rugosa (extinct order); typically composed of Calcite (CaCO3) or replaced by Quartz (SiO2)
sedimentary
Belemnite Fossil
Belemnitida (extinct order of Cephalopods)
sedimentary
Fossil Shell (Bivalve)
Phylum Mollusca, Class Bivalvia (typically composed of Calcium Carbonate / CaCO3)
sedimentary
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Moonstone
Orthoclase Feldspar (formula: (K,Na)AlSi3O8)
mineral
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
Sedimentary
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Grey Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Sunstone
Aventurine Feldspar (Plagioclase Feldspar with inclusions)
mineral
Diamond
Carbon (C)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified wood (principally Silicon Dioxide, SiO2)
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock, primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Sandstone Pebble
Arenite (primarily Quartz, SiO2)
sedimentary
Slate with Iron Staining
Low-grade Metamorphic Mudstone (Slate)
metamorphic
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony/Opal replacing organic matter)
sedimentary
Leopard Skin Jasper
Orbicular Rhyolite (Silicon Dioxide with various impurities)
sedimentary
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary