Granodiorite
Granodiorite
igneous
Category
Man Made Material (Simulated Mineral)
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
Learn about Man Made Material (Simulated Mineral) in the encyclopedia
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Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
River Siltstone / Mudstone Pebble
Siltstone (composed of mixed silicate and carbonate minerals)
sedimentary
Basalt with Quartz/Feldspar Vein
Amygdaloidal Basalt with Plutonic intrusion (SiO2/KAlSi3O8)
igneous
Fulgurite
Lechatelierite
mineral
Dark igneous rock, likely basalt
Basalt; chiefly plagioclase feldspar, pyroxene, and possibly olivine
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Carnelian (orange chalcedony)
Chalcedony, microcrystalline quartz (SiO₂), iron-colored variety
gemstone
Pink tourmaline crystal (probable)
Elbaite tourmaline, Na(Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
mineral
Amazonite
K(AlSi3O8) - Microcline variant
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Likely tumbled calcite or pale limestone fragment
Calcite (CaCO₃), possibly microcrystalline limestone
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Polished green-and-white stone, likely serpentine or nephrite jade
Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (interlocking actinolite–tremolite)
metamorphic
Amethyst (likely rough or cleaved fragment)
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
mineral
Amethyst-bearing quartz cluster
Quartz, SiO₂; purple coloration from irradiation and trace iron
mineral
Clear Quartz / Diamond (untested)
Silicon Dioxide (SiO2) or Carbon (C)
mineral
Chalcedony (Agate/Carnelian variety)
Cryptocrystalline Quartz (SiO2)
mineral
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Blue Aragonite
Aragonite (Calcium Carbonate, CaCO3)
mineral
Banded Calcite (Mexican Onyx)
Calcite (CaCO3)
mineral
Fossilized Gastropod Shell
Gastropoda (Fossilized internal mold or shell body)
fossil
Banded Chert / Sandstone Pebble
Microcrystalline Quartz (SiO2) / Silicified Sandstone
sedimentary
Red Sandstone
Arenite (Iron-rich Sandstone)
sedimentary
Chert (Septarian or Nodular variety)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (with Iron Staining)
Arenite (SiO2 with Fe2O3/FeOOH impurities)
sedimentary
Sandstone (Ferruginous)
Arenite with Hematite cement (SiO2 + Fe2O3)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Yellow Jasper
Quartz (Silicon Dioxide, SiO2 with impurities)
sedimentary
Anthracite Coal
Carbon (with trace impurities)
sedimentary
Sandstone / Chert Gravel
SiO2 (Silicon Dioxide based clastic sedimentary rock)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Polished septarian nodule
Calcite–aragonite cemented carbonate concretion, commonly with clay minerals and iron oxides
sedimentary
Granite
Phaneritic Igneous Rock (Granite)
igneous
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Sandstone
Arenite (SiO2 principal component)
sedimentary