Quartz Pebble
Silicon Dioxide (SiO2)
Category
Browse mineral like industrial smelting waste specimens identified by the Rock Identifier community.
Quartz Pebble
Silicon Dioxide (SiO2)
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite treated with acid
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)
Banded Chert
Microcrystalline Quartz (SiO2)
Quartz pebble
Silicon dioxide (SiO2)
Rough Corundum (Sapphire/Ruby mixture)
Corundum (Aluminum Oxide, Al2O3)
Magnetite Sand (Black Sand)
Magnetite (Fe3O4)
Diamond (or Diamond Simulant)
C (Carbon) or synthetic equivalent
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
Limonite Stained Basalt
Hydrated Iron Oxide on Mafic Volcanic Rock (FeO(OH)·nH2O)
Sandstone Pebble
Arenite (Siliclastic sedimentary rock)
Arfvedsonite (often mistakenly sold as Astrophyllite)
Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]
Hematite
Hematite (Iron(III) oxide, Fe2O3)
Bauxite
Bauxite (mixture of Hydrous Aluminum Oxides)
Green Calcite
Calcium Carbonate (CaCO3)
Smoky Quartz with Feldspar
Quartz (SiO2) with Potassium Feldspar (KAlSi3O8)
Ironstone Concretion
Siderite or Hematite-bonded Concretion
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Quartz Pebble (Iron-Stained Quartz)
Silicon Dioxide (SiO2)
Garnet (Pyrope-Almandine series)
Garnet Group, (Mg,Fe)3Al2Si3O12
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
Agate
Silicon Dioxide (SiO2) - Banded Chalcedony
Magnetite Sand (Black Sand)
Magnetite (Fe3O4)
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
Ruby (Raw Corundum)
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Peacock Ore
Bornite (Cu5FeS4)
Sandstone
Arenite (composed mainly of SiO2)
Possible tektite or volcanic glass specimen
Natural silica glass; composition commonly near SiO₂, but exact identification requires chemical testing
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
Diamond
Carbon (C)
Silver Flakes in Glass
Silver (Ag)
Vesicular Basalt (Lava Rock)
Vesicular Basalt
Quartz with mica and feldspar (Pegmatite fragment)
Granitic Pegmatite (composed mainly of SiO2 with KAlSi3O8)
Chalcedony (Common Opal or Agate variant)
Silicon Dioxide (SiO₂)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Smoky Quartz (Rough)
Silicon Dioxide (SiO2)
Limonite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
Fossil bivalve shell
Likely an internal mold or mineralized shell of a brachiopod or small bivalve; exact taxonomy requires locality and diagnostic details
Schist
Chlorite/Mica Schist
Quartz (Iron-stained or Orange Quartz)
Silicon Dioxide (SiO2)