Limonite Nugget
Limonite (Hydrated iron oxide-hydroxide, FeO(OH)·nH2O)
mineral
Category
Mixed (Predominantly Sedimentary And Igneous)
Browse mixed (predominantly sedimentary and igneous) specimens identified by the Rock Identifier community.
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Limonite Ironstone
Goethite-Limonite concretion / Iron oxide
sedimentary
Graphite
Graphite (Carbon, C)
Mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Shungite
Non-crystalline carbon (allotrope of carbon)
metamorphic
Granite Pebble
Intrusive Igneous Rock
igneous
Sandstone
Sedimentary rock composed mainly of quartz sand grains
sedimentary
Granite
Granite (Phaneritic igneous rock)
igneous
Peridotite
Peridotite (predominantly Olivine and Pyroxene)
igneous
Tektite (Indochinite)
Tektite (Amorphous Meteoritic Glass)
igneous
Granite
Intrusive Igneous Rock (Felsic)
igneous
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Limonite (Iron Ore)
Limonite (mixed iron hydroxides, primarily FeO(OH)·nH2O)
mineral
Copper-stained quartz/igneous rock specimen
Quartz (SiO₂), with secondary copper minerals; host likely altered volcanic rock
mineral
Peach Moonstone
Orthoclase (Potassium Aluminum Silicate, KAlSi3O8)
mineral
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Folded Schist / Gneiss (Metamorphic Rock)
Regional Metaphoric Folded Outcrop (predominantly Schist/Gneiss)
metamorphic
Quartz Druze on Matrix (Geode Fragment)
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite-bearing sulfide specimen
Pyrite (FeS₂), possibly with chalcopyrite (CuFeS₂) and/or marcasite
mineral
Vesicular basalt (weathered lava rock)
Basalt, predominantly plagioclase, pyroxene, and minor olivine/iron oxides
igneous
Topaz
Al2SiO4(F,OH)2
mineral
Granite
Granite
Igneous
Greywacke (River Pebble)
Greywacke sandstone with quartz veining
sedimentary
Quartz Sandstone
Quartz Arenite
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Sandstone Pebble
Quartzose Sandstone (Sedimentary Rock)
sedimentary
Sandstone
Arenite (SiO2 dominant)
sedimentary
Granite Cobble
Phaneritic Plutonic Felsic Rock
igneous
Scoria (Lava Rock)
Scoria (extrusive volcanic rock)
igneous
Veined Quartz
SiO2 (Silicon Dioxide)
Mineral
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite or Magnetite inclusions)
igneous
Concrete
Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)
sedimentary (artificial)
Hypersthene
Hypersthene ((Mg,Fe)SiO3)
mineral
Sandstone
Sedimentary Rock (Quartz/Feldspar grains cemented together)
sedimentary
Black Obsidian
Volcanic Glass (predominantly SiO2)
igneous
White Topaz
Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2
mineral
Dark volcanic rock, likely basalt
Basalt; predominantly plagioclase feldspar, pyroxene, and minor olivine or magnetite
igneous
Granite
Felsic intrusive igneous rock
igneous
Sandstone (Heart-shaped pebble)
Sedimentary Quartz Sandstone
sedimentary
Quartz-rich polymict conglomerate (possibly hydrothermal breccia)
Clast-supported polymict conglomerate dominated by quartz; includes chalcedony/quartz and dark lithic clasts
sedimentary
Iron-rich concretion (probable limonite/goethite concretion)
Hydrated iron oxides, chiefly limonite (FeO(OH)·nH₂O) and goethite (FeO(OH))
sedimentary
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic