Gravel and Sediment Sample
Mixed clastic sediment
sedimentary
Category
Metamorphic Rock (Specifically A Rock Composed Of Minerals)
Browse metamorphic rock (specifically a rock composed of minerals) specimens identified by the Rock Identifier community.
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Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Quartzite Cobble
Metamorphic rock primarily composed of Quartz (SiO2)
metamorphic
Mica-rich rock, likely mica schist
Mica schist, composed chiefly of muscovite and/or biotite with quartz and feldspar
metamorphic
Serpentinite
Serpentinite (composed mainly of Serpentine-group minerals: (Mg, Fe)3Si2O5(OH)4)
metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Fossilized Sand Dollar
Echinoidea (Clypeasteroida)
fossil
Pegmatitic gneiss with a quartz–feldspar vein
Quartz–feldspar-rich gneiss, locally cut by a granitic pegmatite vein
metamorphic
Biotite schist
Mica schist, composed mainly of biotite mica and quartz with feldspar and iron oxides
metamorphic
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
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
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Quartzite Pebble
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Granite / Diorite (Granodiorite)
Granodiorite / Quartz Diorite
igneous
Diorite
Intermediate Phaneritic Igneous Rock (Diorite)
igneous
Polished granite or gneiss stone
Granite, chiefly quartz, feldspar, and dark mica/amphibole; exact identification is uncertain from the photograph
igneous
Granite
Felsic Intrusive Igneous Rock
igneous
Likely quartz-rich pegmatite (weathered, mica-bearing)
Granitic pegmatite, composed mainly of quartz and feldspar with possible mica; exact minerals cannot be confirmed from the photo
igneous
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Slate
Slate (Metamorphic Rock)
metamorphic
Schist
Mica Schist (Metamorphic rock)
metamorphic
Granite (specifically Rapakivi Granite)
Phaneritic Felsic Igneous Rock (Granite)
igneous
Sandstone
Clastic sedimentary rock composed mainly of quartz sand
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Slate
Slate (Metamorphic rock)
metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Red Quartzite Slipper Stone
Quartzite (SiO2)
metamorphic
Red Sandstone
Clastic sedimentary rock (often dominated by SiO2 with Fe2O3)
sedimentary
Rhodonite
(Mn,Fe,Mg,Ca)SiO3
mineral
Red Sandstone
Sedimentary Arenite / Quartzose Sandstone
sedimentary
Granite (Pebble)
Granite (composed of Quartz, Feldspar, and Mica/Amphibole)
igneous
Weathered granite
Granite, typically composed of quartz, feldspar, and mica
igneous
Granite
Granite
igneous
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Gravel or Pebble
Clastic Sedimentary Grain (typically composed of Quartz or Silicate minerals)
sedimentary
Weathered quartzite pebble
Quartzite, composed predominantly of SiO₂ (quartz)
metamorphic
Schist
Mica Schist
metamorphic
Mica-rich rock, likely mica schist
Mica schist, composed chiefly of muscovite and/or biotite with quartz and feldspar
metamorphic
Quartz-rich rock fragment (likely quartzite)
Quartzite, composed chiefly of quartz (SiO₂)
metamorphic
Chert (specifically Banded Chert or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Granite
igneous
Citrine or Yellow Quartz
Quartz (SiO2) with iron impurities
mineral