Gypsum Wallboard (Drywall)
Hydrous calcium sulfate (CaSO4·2H2O)
sedimentary (processed mineral product)
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
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Dyed Agate
Silicon dioxide, SiO2
Mineral (Chalcedony)
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Quartz River Stone
Silicon Dioxide (SiO2)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite / Red Ochre (Iron Ore)
Hematite (Fe2O3)
mineral
Popcorn
Zea mays everta (P. Wilson) (Botanical name for the corn variety)
Organic/Biogenic
Hematite Beads
Hematite (Fe2O3)
Mineral
Pyrite with Limonite/Goethite Alteration (Pseudomorph)
Iron Sulfide (FeS2) transitioning to Hydrated Iron Oxides (FeO(OH)·nH2O)
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.)
Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)
mineral
Magnesite or Howlite (dyed or naturally patterned)
Magnesium carbonate (MgCO3) or Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Mixed polished river stones
Likely quartz, quartzite, chert/jasper, and possibly limestone or marble
mineral
Hematite
Iron(III) oxide, Fe2O3
mineral
Quartz Vein Rock
Silicon Dioxide (SiO2)
mineral
Limonite
FeO(OH)·nH2O
mineral
Limonite
FeO(OH)•nH2O
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Limonite
FeO(OH)·nH2O
mineral
Rhodonite
Rhodonite (Mn2+SiO3)
mineral
Build-A-Bear Plush (Non-Geological)
Polyester fibers (C10H8O4)n and Synthetic Polymers
Anthropogenic / Non-mineral
Slag
industrial by-product
N/A - Non-Geological Item
not a rock/mineral
Opalite
Synthetic Glass (Amorphized Silicon Dioxide)
mineraloid
Titanium Coated Kyanite (Aura Kyanite)
Aluminosilicate (Al2SiO5) with a Titanium-Niobium vacuum-deposited coating
metamorphic
Dyed Agate
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Botryoidal pyrite (likely with quartz or chlorite matrix)
Pyrite, FeS₂; botryoidal aggregate
mineral
Metallic sulfide mineral specimen, likely pyrite
Pyrite (FeS₂), possibly mixed with marcasite or another iron sulfide
mineral
Hematite (likely Botryoidal or Specularite variant)
Iron(III) oxide (Fe2O3)
mineral
Iron-rich rock or Concretion
Ironstone or Limonite concretion
sedimentary
Polished magnetite-rich rock, likely magnetite-bearing schist or ironstone
Magnetite (Fe₃O₄) in a foliated silicate matrix; exact identification requires testing
metamorphic
N/A (Non-Geological Object)
N/A
Specular Hematite
Hematite (Fe2O3)
mineral
Specular Hematite
Specularite (Iron Oxide, Fe2O3)
mineral
Wallboard/Drywall (Gypsum-based)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
sedimentary
Concretion
Sedimentary Concretion (e.g., Siderite or Ironstone)
sedimentary
Man-made Synthetic Material (Plastic/Composite)
Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)
Non-geological / Synthetic
Hematite
Hematite (Fe2O3)
mineral
Satin Spar (Satin Spar Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Specular Hematite with Quartz and Limonite
Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)
Mineral
Hematite
Hematite, Iron(III) oxide (Fe2O3)
mineral