Likely tumbled hematite or magnetite
Hematite (Fe₂O₃) or magnetite (Fe₃O₄)
mineral
Category
Igneous And Sedimentary Mixture
Browse igneous and sedimentary mixture specimens identified by the Rock Identifier community.
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Magnetite Ore
Magnetite (Fe3O4)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Natural freshwater pearls
Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)
gemstone
Tumbled Black Stone
Unknown (possibly basalt, obsidian, or black jasper)
igneous or sedimentary
Quartz
Silicon dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Faceted)
SiO2 - Silicon Dioxide
gemstone
Faceted Clear Quartz or Diamond Simulant
Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic
gemstone
Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartz (Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Rock
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcium Carbonate, CaCO3
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Bauxite (Iron-stained Chert / Ironstone Aggregate)
Hydrous aluminum oxide mixture (mainly Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Goethite α-Fe3+O(OH))
sedimentary
Small weathered mineral/rock fragment
Indeterminate; possibly quartz-bearing feldspathic rock or calcite-rich specimen
mineral
Magnetite (Iron Ore)
Iron(II,III) oxide (Fe3O4)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Green Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz-rich pebble
Mostly quartz (SiO₂), possibly a quartzite or vein-quartz fragment
mineral
Quartz (Raw Chunk)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fools Gold)
Iron Disulfide (FeS2)
mineral
Geode (Unopened)
Quartz/Chalcedony concretion
sedimentary
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar group)
mineral
Carnelian / Agate
Silicon Dioxide (SiO2) - Chalcedony
mineral
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Galena
Lead Sulfide (PbS)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Agate/Jasper pebble)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Snow)
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluoroapatite (Ca5(PO4)3F)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral