Diamond Plate (Steel)
Alloyed Carbon Steel or Aluminum with 'Durbar' pattern
not a rock (Man-made industrial metal)
Category
Anthropogenic (Man Made Material Mimicking Sedimentary Rock)
Browse anthropogenic (man made material mimicking sedimentary rock) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
fossil
Chert (often referred to as 'Jasper' when red)
Chert (microcrystalline quartz, SiO₂)
Sedimentary rock
Limonite (Iron Ore/Sandstone mixture)
Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix
mineral
Chert (River Pebble)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Sandstone
Quartz Arenite (a type of sandstone composed of more than 90% quartz)
Sedimentary Rock
Red Sandstone
Arenite (ferruginous sandstone)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Jasper and Quartzite mix
Silicon Dioxide (SiO2) with impurities
sedimentary or metamorphic
Fossil Coral
Scleractinia or Anthozoa (Fossilized)
fossil
Mookaite Jasper
Silicified Radiolarite (Silicon Dioxide: SiO2)
sedimentary
Shale
Shale (fine-grained clastic sedimentary rock)
Sedimentary
United States Quarter Dollar
Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)
Metal / Man-made mineral-like object
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
fossil
Greenschist
Greenschist facies rock (containing chlorite, actinolite, albite, and epidote)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
fossil
Silicified fossil-bearing limestone (likely chert/agate replacement)
Microcrystalline quartz (SiO₂) replacing carbonate rock; possible fossiliferous limestone
sedimentary
Fossil Coral
Scleractinia (Fossilized Hexacoral)
fossil
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Sandstone
Arenite (a specific type of sandstone with less than 15% matrix)
Sedimentary rock
Tumbled yellow quartz-rich stone, likely yellow jasper or quartzite
Jasper/quartzite; mainly microcrystalline quartz (SiO₂), with iron-oxide staining
metamorphic
Black Beach Pebble (Basalt / Slate Pebble)
Rounded Fine-Grained Clastic / Igneous Rock Pebble
sedimentary
Fossil-bearing limestone
Bioclastic limestone, likely containing bivalve or brachiopod impressions
fossil
Chert (River Pebble)
Silicon Dioxide (SiO2)
sedimentary
Travertine (likely polished limestone)
Calcite-rich carbonate rock; predominantly CaCO₃
sedimentary
Weathered sandstone or iron-stained sedimentary rock
Quartz-rich sandstone, possibly ferruginous sandstone
sedimentary
Weathered limestone or calcareous sandstone
Calcite-rich carbonate rock, chiefly calcium carbonate (CaCO₃), possibly fossiliferous limestone
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Mica Schist
Foliated Metamorphic Rock (rich in Muscovite or Biotite)
metamorphic
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Polished orbicular jasper (likely ocean jasper)
Silicified volcanic rock; chiefly microcrystalline quartz (SiO₂), with feldspar and iron-rich alteration minerals
sedimentary
Banded Chert (or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Opalite
Synthetic Opalised Glass
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Opalite
Synthetic Silicon Dioxide (SiO2)
mineral
Graphite-veined Quartzite
Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)
metamorphic
Puddingstone (Jasper Conglomerate)
Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)
Sedimentary
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Mixed collection of natural stones
Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks
igneous, metamorphic, sedimentary
Petrified Wood
Silicified Wood / Fossilized Wood (SiO2)
sedimentary
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral