Ferruginous Sandstone
Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)
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.
Greenstone (Epidote/Chlorite Rich Rock)
Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))
metamorphic
Pebble (likely Quartzite or Chert)
Clastic Sediment, potentially composed of SiO₂ (Quartz)
Mineral, Sediment
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
Mineral/Sedimentary
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Serpentine (Serpentinite)
Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Quartz Vein in Pelite (Metamorphic Rock)
Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)
metamorphic
Serpentine
Serpentinite (composed mainly of Group Minerals Antigorite, Chrysotile, and Lizardite; Mg3Si2O5(OH)4)
metamorphic
Quartzite Pebble
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Red Sandstone (Hematitic)
Clastic sedimentary rock (SiO2 with Fe2O3 inclusions)
sedimentary
Schist
Schist (various mineral compositions)
metamorphic
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Sandstone Concretion
Sedimentary concretion
Sedimentary
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenicola (comprising mostly Quartz, SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Dalmatian Stone
Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock
igneous
Sandstone
Arenite
sedimentary
Quartzite (Beach Pebble)
Quartzite (composed primarily of SiO2)
metamorphic
Red Sandstone
Arenite (primarily composed of SiO2 with Fe2O3 cement)
sedimentary
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
Igneous
Sandstone or Limestone
Arenite or Calcareous Sedimentary Rock
Sedimentary
Quartzite (River Pebble)
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Quartzite (specifically Milky Quartz variety)
Quartz (SiO2)
metamorphic
River Siltstone Pebble
Siltstone (primarily composed of silica and clay minerals)
sedimentary
Schist
Mica Schist (primarily composed of quartz, feldspar, and mica)
metamorphic
Quartzite (Milky)
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Desert Varnish (on Sandstone)
Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)
sedimentary
Granodiorite
Granodiorite (Quartz-Feldspar-Biotite Plutonic Rock)
igneous
White Topaz
Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2
mineral
Green Druzy Quartz (Prasiolite)
Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)
mineral
Green Quartzite (with Fuchsite)
Quartzite with Muscovite variety Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Pebble or Cobble (likely composed of sandstone or conglomerate)
Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)
Sedimentary Rock (possibly a conglomerate or coarse-grained sandstone)
Ironstone Concretion (Moqui Marble)
Iron-oxide Concretion (Hydrated ferric oxide, Fe2O3·nH2O)
sedimentary
Red Sandstone
Arenite (primarily Quartz SiO2 with Hematite Fe2O3 cement)
sedimentary
Pink Granite
Phaneritic Plutonic Igneous Rock (composed of K-feldspar, Quartz, and Mica)
igneous
Granitic Gneiss
Gneiss (Metamorphic rock of granitic composition)
metamorphic
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Shale
Shale (Sedimentary rock composed of mud/clay minerals)
sedimentary