Tourmalinated Quartz
Quartz (SiO2) with included Tourmaline (complex borosilicate)
Mineral composite
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Sea Shell Fragment (Calcium Carbonate)
Aragonite / Calcite (CaCO3)
mineral
Unakite
Unakite (Altered Granite composed of Orthoclase KAlSi3O8, Epidote Ca2(Al, Fe)3(SiO4)3(OH), and Quartz SiO2)
metamorphic
Greenschist
Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)
metamorphic
Chrysocolla Cuprite
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) and Cu2O (Cuprite)
mineral composite
Ocean Jasper
Spherulitic Chalcedony (SiO2)
sedimentary
Hand-Drawn Trading Card (Amateur Artwork)
Cellulose-based substrate with wax/graphite/ink deposit (n/a for minerals)
Organic/Synthetic Composite (Paper and Pigment)
Unakite
Epidotized Granite
metamorphic
Black Kyanite
Aluminum Silicate (Al2SiO5)
mineral
Marble (Sculpted Statue)
Metamorphic Limestone (composed primarily of Calcite, CaCO3)
metamorphic
Limestone
CaCO3 (principally Calcite)
sedimentary
Tiger Iron
Tiger Iron (composite of Tiger's Eye, Red Jasper, and Hematite)
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Sandstone (Red Sandstone)
Arenite
sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 + Fe2O3)
sedimentary
Quartz with Iron Oxide
SiO2
mineral
Blue-green chrysocolla rough specimen
Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite
mineral
Basalt
Extrusive Igneous Rock
igneous
Sandstone
Arenite (Sandstone)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Red Garnet (likely Almandine or Pyrope)
Garnet group: X3Y2(SiO4)3 (e.g., Almandine: Fe3Al2Si3O12)
mineral
Unakite
Epidotized Granite
metamorphic
Limonite (Iron Ore)
Hydrated ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Polished malachite slab
Malachite, Cu₂CO₃(OH)₂; likely polished and possibly resin-stabilized
mineral
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Porcelain (Stoneware Ceramic)
Mullite / Silica-glass composite (Al6Si2O13)
metamorphic (man-made)
Bumblebee Jasper
Calcite with Arsenic and Manganese oxides (technically a volcanic rock)
igneous
Quartz Sand Gravel
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone Pebble
Arenite (Siliclastic sedimentary rock)
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (composed of SiO2, CaCO3, or Fe2O3 cement)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Banded Iron Formation (BIF)
Banded Iron Formation (predominantly Hematite and Chert)
sedimentary
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH), AlOOH)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Amber Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone (likely Quartzite-rich)
Arenite (primarily SiO2)
sedimentary