Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Category
Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)
Browse industrial byproduct (often confused with igneous rocks or meteorites) specimens identified by the Rock Identifier community.
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Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Banded Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
White Sapphire
Corundum (Al2O3)
mineral
Ruby in Fuchsite
Corundum (Al2O3) in Chrome-Mica (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Peridotite (Dunite/Peridot Xenolith)
Peridotite (predominantly Olivine (Mg, Fe)2SiO4)
igneous
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Lazulite
Lazulite (MgAl2(PO4)2(OH)2)
mineral
Pegmatite with Quartz and Feldspar
Intrusive Igneous Rock
igneous
Pyrite
Iron Pyrite (FeS₂)
Mineral
Water and Silt (Sedimentary Environment)
Suspended Sediment / H2O (dihydrogen monoxide)
sedimentary
Garnet
Garnet Group (formula varies: e.g., Almandine Fe3Al2Si3O12 or Pyrope Mg3Al2Si3O12)
gemstone
Pyrite (Fool's Gold) Ore
Iron Disulfide (FeS2)
mineral
Yellow Quartz / Quartzite Pebble
Silicon Dioxide (SiO2)
mineral
Smoky quartz (rough, water-worn crystal)
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Iron-Stained Quartz (Riverside Cobble)
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Schist
Schist (various compositions)
metamorphic
Yellow Agate
Agate (Varietal form of Chalcedony/Quartz, SiO2)
mineral
Iolite (Cordierite)
Cordierite (Magnesium iron aluminum cyclosilicate), Mg2Al4Si5O18
metamorphic
Ruby
Corundum (mineral species), variety: Ruby (Al2O3 with Cr3+ as the chromophore)
Mineral
Pyrite (on Quartz matrix)
Iron Sulfide (FeS2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sapphire (Rough)
Corundum (Al2O3)
mineral
Fuchsite or Green Mica Schist
Muscovite variant (KAl2(AlSi3O10)(OH)2 with Cr)
metamorphic
Raw Sapphire / Corundum
Corundum (Al2O3 - Aluminium oxide)
mineral
Sapphire
Corundum (Al2O3)
gemstone
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Tumbled blue glassy mineral, possibly sodalite or blue aventurine
Identification uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) or blue-dyed quartz/slag-like material
mineral
Ruby and Diamond Heart Pendant
Corundum (Al2O3) and Diamond (C)
mineral
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Ruby in Matrix
Corundum (Al2O3)
mineral
Biotite Mica
Biotite, K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Rhodonite
Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Quartzite pebble
Metamorphic Quartzite (SiO2)
metamorphic
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
White Sapphire
Corundum (Al2O3)
mineral
Ruby
Corundum (Al2O3:Cr)
gemstone
Unidentified weathered rock fragments
Likely mixed silicate rocks; specific identification requires testing
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Sugilite
KNa2(Fe,Mn,Al)2Li3Si12O30
mineral