Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Category
Igneous And Metamorphic Derivative (Weathered)
Browse igneous and metamorphic derivative (weathered) specimens identified by the Rock Identifier community.
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Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Quartz (Raw Chunk)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Common Quartz Pebble
Silicon dioxide (SiO2) rock fragment
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Tumbled quartz pebble
Quartz (silicon dioxide, SiO₂), likely milky or smoky quartz
mineral
Quartz Pebble (Iron-Stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite inclusion
mineral
Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Corundum (Ruby/Sapphire crystal)
Al2O3 (Aluminum Oxide)
mineral
River Pebble (Likely Quartzite or Chert)
Quartzite (primarily SiO2)
metamorphic
Riverstone Quartzite / Chalcedony Nugget
Silicon Dioxide (SiO2)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)
Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Blue Zircon
Zircon (Zirconium Silicate), ZrSiO4
gemstone
Pyrite
Iron Sulfide (FeS2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-Stained or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz in Siltstone or Feldspar
Silicon Dioxide (SiO2)
mineral
Exposed aggregate concrete (stone-chip surface)
Portland-cement concrete containing natural aggregate; not a natural rock
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Magnetite with Serpentine
Magnetite (Fe3O4) in Serpentine Matrix
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Mixed collection of natural stones
Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks
igneous, metamorphic, sedimentary
Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Iridescent schist or phyllite
Micaceous quartz-rich schist/phyllite, likely containing muscovite or chlorite
metamorphic
Quartz-bearing rock fragment
Likely quartz (SiO₂) with iron-oxide staining and possible host-rock grains
mineral
Tumbled milky quartz
Quartz, SiO₂
mineral