Dyed Blue Agate (Dragon Vein Agate)
Silicon Dioxide (SiO2) with artificial cobalt/organic dyes
mineral
Category
Anthropogenic Material (Man Made Rock)
Browse anthropogenic material (man made rock) specimens identified by the Rock Identifier community.
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Diamond
Native Carbon (C)
mineral
Chert (Arrowhead)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (siliciclastic sedimentary rock composed mostly of quartz)
sedimentary
Green Agate
Silicon dioxide (SiO₂)
mineral
Mystic Topaz
Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)
mineral
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Sea Glass
Man-made silicate glass (Amorphous silicon dioxide)
mineral
Porcelain Tile (Sandstone-look)
Man-made Ceramic (resembling Quartz-rich Sandstone)
sedimentary (imitation)
Chert (varietal Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Chert (Flint)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Man-made rock-like material
Hematite
Iron(III) oxide (Fe2O3)
mineral
Weathered chert or chalcedony nodule
Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony
sedimentary
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
gemstone
Cobalt Glass Slug (Cullet)
Man-made Silicate Glass with Cobalt Oxide (CoO)
mineraloid
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Opalite
Synthetic glass (SiO2 + metal additions)
mineraloid
Metallic sulfide mineral fragment, likely galena
Galena (lead sulfide, PbS), tentative identification
mineral
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Sandstone
Arenite
sedimentary
Small dark mineral/rock fragment
Indeterminate; possibly magnetite-bearing basalt or iron-rich slag
mineral
Granite
Granite (a plutonic rock)
Igneous
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Slate
Metamorphic pelitic rock
metamorphic
Sea Glass
Amorphous silicon dioxide (SiO2) - Man-made glass tumbled by nature
mineral
Raw quartz crystal
Quartz (silicon dioxide, SiO₂), likely milky or included quartz
mineral
Anthropogenic Heat Source (Electronic/Industrial Interface)
Thermal IR emission (Electronic infrastructure)
not a rock or mineral
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Tektite
Impactite (Natural Silicate Glass)
meteorite
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Blue Goldstone
Synthetic glass with copper or cobalt/manganese inclusions
man-made glass
Iron-stained quartz-rich rock, possibly jasper or chert
Microcrystalline quartz (SiO₂) with iron oxides/hydroxides
mineral
Greenstone Celt (Polished Stone Axe)
Metamorphosed mafic rock (often Basalt or Diabase)
metamorphic