Limestone with Iron Inclusions
Calcium Carbonate (CaCO3) with Hematite/Limonite
sedimentary
Category
Mineral Description (Anthropogenic Material)
Browse mineral description (anthropogenic material) specimens identified by the Rock Identifier community.
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Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Green copper-mineral specimen, likely chrysocolla or copper-bearing serpentine
Tentatively chrysocolla (hydrated copper phyllosilicate, approximately (Cu,Al)2H2Si2O5(OH)4·nH2O); exact identification requires testing
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Efflorescence (on Clay Brick)
Crystalline salt deposits (typically Sodium Sulfate Na2SO4, Calcium Carbonate CaCO3, or Potassium Sulfate K2SO4)
Mineral precipitate (anthropogenic context)
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Raw Amber / Resin Mineral
Succinite (Fossilized Tree Resin)
gemstone
Fulgurite
Fulgurite (Lechatelierite or fused sand/quartz)
mineral
Red Jasper with Quartz
Microcrystalline Quartz (SiO2)
sedimentary
Quartz-rich pegmatite with green mica or chlorite
Granitic pegmatite; chiefly quartz (SiO₂), with feldspar and probable muscovite/chlorite
igneous
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Iron-rich hematite/goethite concretion (likely limonite)
Hematite (Fe₂O₃) with goethite (FeO(OH)) and limonite
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone (with biological crust)
Arenite (SiO2 based)
sedimentary
Olivine (Peridot)
Olivine Group (Mg,Fe)2SiO4
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Milky quartz–rich rock
Quartz (SiO₂), likely massive milky quartz with minor dark inclusions
mineral
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Quartz
SiO2
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Cubic Zirconia (Diamond Simulant)
Zirconium Dioxide (ZrO2)
mineral
Limonite
FeO(OH)·nH2O (Hydrated iron oxide)
mineral
Sandstone (Feldspathic / Arkose)
Sandstone (SiO2 with variable mineral grains)
sedimentary
Pink quartz (likely rose quartz)
Quartz, silicon dioxide (SiO₂), commonly rose quartz colored by trace impurities and microscopic inclusions
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Leopard jasper (orbicular jasper)
Silicified volcanic rock, chiefly microcrystalline quartz/chalcedony (SiO₂) with feldspar and iron-oxide inclusions
metamorphic
Raw Diamond
Carbon (C)
gemstone
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Agatized Fossil (Druzy Agate)
Silicon Dioxide (SiO2) replacing organic matter
sedimentary
Obsidian
Volcanic Glass (70-75% SiO2 with MgO and Fe3O4)
igneous
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
River Pebble (Siltstone / Sandstone Pebble)
Sedimentary Rock (Quartz, Feldspar, Clay Minerals)
sedimentary
Quartz (Pink/Rose or Hematinoid Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral