Sandstone
Sandstone (SiO2 dominated clastic sedimentary rock)
sedimentary
Category
Mineraloid Like Synthetic Material
Browse mineraloid like synthetic material specimens identified by the Rock Identifier community.
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Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Fossil coral (likely solitary rugose coral)
Rugosa; possibly genus Heliophyllum or similar
fossil
Red Sandstone
Arenite (high iron oxide content)
sedimentary
Diorite
Phaneritic intermediate plutonic rock
igneous
Coquina / Shell Limestone
Coquina (Bioclastic Limestone)
sedimentary
Quartzite with Chlorite / Epidote Inclusion
Metamorphic Quartzite (SiO2 with chlorite/epidote inclusions)
metamorphic
Sandstone
Arenite
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (Jasper)
Chert / Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Sandstone (primarily SiO2 with iron oxide cement Fe2O3)
sedimentary
Likely weathered quartz-rich stone
Indeterminate; possibly quartz-bearing granite or milky quartz
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (Flint/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Schist
Mica Schist (primarily consisting of muscovite, biotite, and quartz)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Sandstone
Arenite
sedimentary
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Ruby in Matrix
Corundum (Al2O3)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (often called Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Chert (or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Serpentine (likely serpentinized ultramafic rock)
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; commonly derived from peridotite
metamorphic
Cupronickel (on a 1981 Mexico 20 Pesos coin)
Copper-Nickel Alloy (Cu75Ni25)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Mica Schist
Mica Schist (Quartz-Biotite-Muscovite Schist)
metamorphic
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Quartz Arenite (iron-stained) / Quartzite precursor
sedimentary
Banded Iron Formation (Chert)
Banded Iron Formation (BIF) with Jasper/Chert layers
sedimentary
Chert / Flint Pebble
Microcrystalline quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Graphic Granite
Pegmatitic Feldspar with Quartz intergrowths
igneous
Granite Cobble
Felsic Intrusive Igneous Rock
igneous
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Anthropogenic (Man-made)