Greenstone
Greenschist
Category
Browse mineral (man made aura treatment) specimens identified by the Rock Identifier community.
Greenstone
Greenschist
Jasper
Jasper (Silicon Dioxide, SiO2)
Red Sandstone
Arenite (with Iron Oxide)
Petrified Wood (Jet or Coalified Wood appearance)
Silicified wood (principally SiO2) or Carbonized Wood
Granite
Granite (Alkali feldspar, Plagioclase feldspar, and Quartz)
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
Chert / Flint
Microcrystalline Quartz (SiO2)
Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
Serpentine (Nephrite-like River Cobble)
Serpentinite (Hydrous Magnesium Iron Silicate)
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
Granite (likely a river or beach pebble)
Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)
Sandstone with Quarzite clasts
Arenite (SiO2 based)
Sandstone (Quartz-rich)
Arenite (SiO2)
Sandstone (Ferruginous)
Arenite (variable SiO2 with Fe2O3 staining)
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 predominantly)
Sandstone (Ferruginous)
Arenite (with Hematite/Limonite cement)
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Hematite/Limonite oxides)
Quartzite
Quartzite (primarily SiO2)
Red Sandstone
Clastic Terrigenous Sedimentary Rock (typically Hematitic Quartz Arenite or Arkose)
Agate Nodule / Weathered Chert
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt
Slag (Industrial Glass Slag)
Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
Fossiliferous Shale
Laminated Mudrock with plant fossils
Black Pearl (Tahitian or Irradiated Type)
Organic gemstone (Calcium Carbonate with Conchiolin Binding)
Sandstone (Red Arkose)
Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)
Scoria (Basaltic Lava Rock)
Vesicular Basalt
Sandstone (Red)
Arenite (primarily SiO2 with Iron Oxide staining)
White Marble
Recrystallized Calcite (CaCO3)
Sandstone (Quartzose Pebble)
Clastic Sedimentary Rock (Litharenite/Quartz arenite)
New Jade (Serpentine)
Antigorite / Serpentine Group (Mg3Si2O5(OH)4)
Shale
Shale (composition varies: primarily clay minerals and quartz)
Greenstone / Greenstone Pebble
Greenschist (metamorphosed basalt or gabbro)
Sandstone
Arenite (primarily SiO2)
Sandstone
Arenite (primarily SiO2)
Quartzite (with Iron Staining)
Metamorphosed Quartz Sandstone (SiO2)
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
Sandstone (Quartzite-rich)
Clastic sedimentary rock (SiO2 primary)
Sandstone
Arenite (primarily SiO2)
Sandstone
Arenite (composed primarily of SiO2)
Sandstone
Arenite (SiO2 with Fe2O3)
Sandstone (Ferruginous)
Arenite (with Goethite/Limonite cement)