Chert (Flint Arrowhead)
Silicon Dioxide (SiO2)
Category
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
Chert (Flint Arrowhead)
Silicon Dioxide (SiO2)
Corundum (Sapphire/Ruby in Matrix)
Corundum (Al2O3)
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
Green Aura Quartz
Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)
Blue Slag Glass
Amorphous Silica (Byproduct of smelting)
Granite
Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
Diorite
Diorite
Granite
Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).
Rough Diamond
Diamond (Pure Carbon: C)
Coquina
Biogenic Limestone (Coquina)
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)
Dark rounded pebble, likely basalt or slag
Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag
Flint / Chert
Microcrystalline Quartz (SiO2)
Chert (Flint)
Chert (Cryptocrystalline Silica, SiO2)
Chert (and associated river cobbles)
Silicon dioxide (SiO2)
Chert (and/or Flint)
Chert (Cryptocrystalline variety of Quartz, SiO2)
Common Marble
Calcium Carbonate (CaCO3)
Chalk
Calcium carbonate (CaCO3)
Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Chert (often called Flint or Agate nodule)
Cryptocrystalline Quartz (SiO2)
Diamond
Carbon (C)
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
Chert (Flint)
Microcrystalline Quartz (SiO2)
Chert (often called Flint)
Chert (SiO2)
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Sandstone (Quartzose)
Sandstone (SiO2 dominated)
Diamond (Colorless/White)
Carbon (C)
Diamond
Carbon (C)
Chert (Flint)
Chert (SiO2)
Banded Calcite or Travertine
Calcium Carbonate (CaCO3)
Ferrochrome Slag
Industrial Glassy Slag (Fe-Cr alloy byproduct)
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
Rough Sapphire (Corundum)
Corundum (Al2O3)
Slag
Ferrous Slag (Siliceous industrial waste)
Diamond
Carbon (C)
Diamond (in a jewelry setting)
Carbon (C)
Fulgarite
Fulgurite (Lechatelierite / Vitrified Sand)
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)