Concrete
Hydrated Portland Cement Aggregate Composite
Category
Browse mineral (man enhanced) specimens identified by the Rock Identifier community.
Concrete
Hydrated Portland Cement Aggregate Composite
Dyed Blue Agate Slice
Silicon Dioxide (SiO2)
Dyed Agate Geode Slice
Silicon Dioxide (SiO2) - Banded Chalcedony
Concretion
Sedimentary Concretion (Ironstone / Calcite Concretion)
Grey Chalcedony
Silicon Dioxide (SiO2)
Diamond (as featured in jewelry)
Diamond (C - pure carbon)
Druzy Quartz
Silicon Dioxide (SiO2)
Opalite
Synthetic Glass (SiO2 + impurities)
Opalite
Synthetic Glass (typically Silica/Magnesium based with metal additives)
Silicon Carbide (Carborundum)
Silicon Carbide (SiC) / Moissanite (natural)
Dyed Pink Quartzite
Tumbled and Dyed Quartzite (SiO2 with dye treatment)
Carnelian Agate
Silicon Dioxide (SiO2) - variety Carnelian (Chalcedony)
Dragon Vein Agate
Chalcedony (cryptocrystalline Quartz), SiO2
Bornite
Cu5FeS4 (Copper Iron Sulfide)
Bismuth Crystal
Bismuth (Bi)
Aura Rose Quartz
SiO2 (Silicon Dioxide with Titanium/Gold coating)
Unidentifiable Rock Fragment
Goldstone
Aventurine glass
Dyed Aura Quartz
Silicon Dioxide (SiO2) with metallic coating
Agate (Polished Slice)
Banded Chalcedony (SiO2)
Carnelian (a variety of Chalcedony)
Cryptocrystalline Quartz (SiO2) with iron oxide inclusions
Black Opal
Hydrated Silica (SiO2·nH2O)
Polymer Clay (Mock Mineral)
Polyvinyl chloride (PVC) with plasticizers and pigment
Aggregate Concrete
Anthropogenic Conglomerate (Technosol)
Pink Dyed Agate (Banded Chalcedony)
Silicon dioxide (SiO2) - variety Chalcedony
Black Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Ruby in Matrix
Corundum (Al2O3)
Sandstone Concretion
Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)
Opalite
Synthetic opalescent glass
Cherry Quartz
SiO2 (Silicon Dioxide with iron-rich inclusions/dye)
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
Ruby in Fuchsite (often sold as Ruby in Zoisite)
Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
Ocean Jasper Mushroom
Orbicular Jasper (Silicon Dioxide, SiO2 mixed with various impurities)
Opalite
Synthetic Opalite Glass (Silicon Dioxide)
Opalite
Synthetic Opalised Glass
Slag (Industrial Byproduct)
Artificial silicate/iron byproduct
Dyed or coated quartz geode
Quartz geode; silicon dioxide (SiO₂), likely artificially color-enhanced
Dyed Blue Agate Slice
Silicon Dioxide (SiO2) - Variety Agate
Boulder Opal
Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)
Quartz Geodes and Crystal Clusters
Silicon Dioxide (SiO2)
Onyx (Black Onyx)
Onyx (Silicon Dioxide, SiO2)
Dyed Agate
Silicon Dioxide (SiO2)