Diorite (Polished Tumble)
Diorite (Intermediate intrusive igneous rock)
Igneous
Category
Anthropogenic (Man Made Material)
Browse anthropogenic (man made material) specimens identified by the Rock Identifier community.
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Green Banded Chert (Agate/Jasper)
Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Sandstone
Arenite (Sedimentary rock comprising sand-sized grains)
sedimentary
Petrified Wood (Silicified Fossil)
Silicified Wood (SiO2)
sedimentary
Limonite (Iron Ore)
Hydrous Iron Oxide (goethite, lepidocrocite)
Mineral
BROWN GRANITE (likely 'Tan Brown' or similar)
Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)
igneous
Jadeite (Jade)
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Slag (Industrial Glass Slag)
Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)
Mineraloid (Industrial byproduct)
Chert (Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Note: No specimen visible
N/A
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Coquina / Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Red Sandstone
Arenite (with Iron Oxide cement)
sedimentary
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Green Jasper
Silicon Dioxide (SiO2)
sedimentary
Quartzite River Pebble
Quartzite (primarily SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
United States Quarter Dollar
Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)
Metal / Man-made mineral-like object
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz Vein in River Siltstone
Crystalline Quartz (SiO2) in Siliclastic Matrix
sedimentary
Pumice or Scoria
Vesicular volcanic rock
Igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone Clast
Arenite (primarily SiO2)
sedimentary
Basalt (Vesicular)
Extrusive mafic igneous rock; primarily (Mg, Fe)2SiO4 (Olivine), CaAl2Si2O8 (Plagioclase Feldspar), and Pyroxene
igneous
River Siltstone / Mudstone Pebble
Siltstone (composed of mixed silicate and carbonate minerals)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
sedimentary
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Flint / Chert
Silicon dioxide (SiO2)
sedimentary
Diamond (or Diamond Simulant like Cubic Zirconia)
Carbon (C) - if Diamond; Zirconium dioxide (ZrO2) - if Cubic Zirconia
mineral
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Slate
Slate (Foliated metamorphic rock)
metamorphic
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Ferruginous Sandstone (Ironstone Conglomerate fragments)
Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)
sedimentary
Zebra Jasper
Tetragonal Silicon Dioxide (Quartz) with impurities
sedimentary
Scoria
Vesicular Basaltic Glass
igneous
Peridot
Olivine ((Mg,Fe)2SiO4)
Mineral
Quartzite
Quartzite (SiO2)
metamorphic