Slag Glass (Cullet)
Amorphous Silica (man-made), primarily SiO2 with trace metal oxides
Category
Browse man made rock (sedimentary analogue) specimens identified by the Rock Identifier community.
Slag Glass (Cullet)
Amorphous Silica (man-made), primarily SiO2 with trace metal oxides
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
Cardstock (Paper)
Cellulose (C6H10O5)n
Granite
Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)
Goldstone (Red/Brown)
Aventurine Glass (SiO2 with Copper inclusions)
Chert Arrowhead (Lithic Tool)
Microcrystalline quartz (SiO2) - Archeological lithic artifact
Flint
Sedimentary cryptocrystalline quartz (SiO2)
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
Chert with Limestone
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
Granite / Diorite (Granodiorite)
Granodiorite / Quartz Diorite
White Marble
Recrystallized Calcite Rock (CaCO3)
Coquina
Bioclastic Limestone (Calcium Carbonate, CaCO3)
Chert
Sedimentary cryptocrystalline quartz (SiO2)
Riverstone (Sandstone Pebble)
Arenite (SiO2 with various lithic fragments)
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
Note: Item is a Synthetic/Man-made Object
Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
Pumice
Pumice (Vesicular volcanic glass)
Chert (Nodular or Massive Variety)
Cryptocrystalline Quartz (SiO2)
Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Goldstone (aventurine glass)
Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Blue Chalcedony Cube
Silicon Dioxide (SiO2)
Chert (specifically Flint or Common Chert node)
Silicon Dioxide (SiO2)
Granite
Granite (a plutonic rock)
Blue Lace Agate
Chalcedony (SiO2) with trace inclusions
Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)
Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy
Blue Sapphire (Synthetic or Man-made Glass Imitation)
Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic
Chert Pebble/Nodule
Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)
Coquina (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
Chert / River Pebble
Microcrystalline Quartz (SiO2)
Rough Sapphire (Corundum)
Corundum (Al2O3)
Slate
Metamorphic Pelitic Rock
Bauxite
Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
Chalk
Micrite (primarily Calcium Carbonate, CaCO3)