Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Category
Synthetic Or Natural Fiber
Browse synthetic or natural fiber specimens identified by the Rock Identifier community.
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Howlite (Tumbled)
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Pearl
Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)
mineral
Yellow Jade
Jadeite or Nephrite (various silicates)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Citrine Geode
Citrine (Silicon Dioxide, SiO2)
mineral
Pearl
Biogenic CaCO3 (Aragonite)
mineral
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Raw Corundum (Sapphire/Ruby variant)
Aluminum oxide (Al2O3)
mineral
Earthy Hematite / Goethite Surface
Iron Oxide (Fe2O3 – α-FeO(OH))
mineral
Dyed Agate
SiO2
mineral
Diamond (likely facet or crystal shard)
Diamond (C)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
River Rock (Basalt/Greywacke)
Aphanitic Basalt or Lithic Sandstone (Greywacke)
igneous
Sapphire (Rough Corundum)
Corundum (Aluminum Oxide, Al2O3)
mineral
Dyed Dragon Vein Agate
Silicon Dioxide (SiO2) with artificial dye
mineral
Kimberlite
Kimberlite (Potassic ultramafic volcanic rock)
igneous
Citrine
SiO2 (Silicon Dioxide)
mineral
Diamond (or Cubic Zirconia simulant)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Sandstone
Arenite
sedimentary
Sapphire
Corundum (Al2O3)
mineral
Garnet and Quartz
Pyrope or Almandine (Red Garnets) and Quartz (Center Stone)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Rough Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Citrine
Crystalline Quartz (SiO2) with iron impurities
mineral
Diamond (in jewelry mount)
Carbon (C)
mineral
Slag Glass
Silicon dioxide with impurities
mineral
Magnesite or Howlite (dyed or naturally patterned)
Magnesium carbonate (MgCO3) or Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Ruby (Raw Corundum)
Corundum (Al2O3) with Chromium traces
mineral
Pink Tumbled Agate
Silicon Dioxide (SiO2) with dye
mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral
Diamond (in jewelry)
Carbon (C)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Shale
Fissile Mudstone (Shale)
sedimentary
Iron Slag
Anthropogenic Ferro-silicate
mineral