Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Category
Metamorphic Rock (For Nephrite And Some Jadeite); Mineral (For Jadeite)
Browse metamorphic rock (for nephrite and some jadeite); mineral (for jadeite) specimens identified by the Rock Identifier community.
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Milk Quartz (Vein Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Red Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with Fe2O3 inclusions)
metamorphic
Garnet in Quartz Matrix
Almandine Garnet (Fe3Al2(SiO4)3) in Quartz (SiO2)
metamorphic
Serpentinite (likely brecciated serpentinite)
Serpentinite; primarily serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite, brucite, and relict olivine/pyroxene
metamorphic
Agate
Chalcedony (cryptocrystalline variety of Quartz, SiO2)
mineral
Granite
Granite (a felsic intrusive igneous rock)
Igneous
Green Quartz (Prasiolite/Adventurine)
Silicon Dioxide with inclusions (SiO2)
mineral
Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Nuummite
Antophyllite-Gedrite (Orthorhombic amphiboles)
metamorphic
Ruby in Zoisite
Ruby (α-Al2O3) embedded in Zoisite (Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (composed of multiple minerals)
Vesicular Basalt with Mineral Inclusions
Vesicular Basalt
igneous
Tiger's Eye
Silicon dioxide (SiO2) with fibrous inclusions of crocidolite (riebeckite)
Mineral
Silty Shale
Silty Shale (Fissile Sedimentary Rock)
sedimentary
Sandstone (likely Graywacke or Siltstone variety)
Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)
sedimentary
Schist (Oxidized)
Mica Schist with Iron Oxide staining
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Quartz Vein in Greenstone
Hydrothermal Quartz (SiO2) with Chlorite/Epidote Schist host rock
metamorphic
Greenstone / Greenstone Pebble
Greenschist (metamorphosed basalt or gabbro)
metamorphic
Gneiss
Gneiss
metamorphic
Ferruginous Sandstone
Sandstone (rich in iron oxides/hydroxides)
sedimentary
Desert Rose (Baryte/Gypsum Rosette)
Baryte (BaSO4) or Gypsum (CaSO4·2H2O)
mineral
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Massive Quartz
Silicon dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone Pebble
Arenite
sedimentary
Petrified Wood
Silicified wood (Quartz, SiO2)
metamorphic
Greenstone
Chlorite schist / Meta-basalt
metamorphic
Green Schist
Greenschist (containing Chlorite, Actinolite, and Epidote)
metamorphic
Sandstone Concretion
Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)
sedimentary
Tumbled green aventurine (likely)
Quartz (SiO₂) with fuchsite or other green mica inclusions
mineral
Shale with Coprolite influence
Argillaceous sedimentary rock (Shale/Mudstone)
sedimentary
Black Diamond / Black Sapphire
Carbon (C) or Corundum (Al2O3)
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Peridot (Olivine)
Olivine (Magnesium Iron Silicate), (Mg,Fe)2SiO4
mineral
Red Sandstone
Arenite (high iron oxide content)
sedimentary
Garnet (likely Almandine or Pyrope)
Garnet Group, Nesosilicates (Complex chemistry, e.g., Almandine: Fe3Al2Si3O12)
mineral
Coarse-grained Quartz and Feldspar Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8)
igneous
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Quartzite
Hydrothermal Quartz or Quartzite (SiO2)
metamorphic
Citrine (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Sandstone (mainly SiO2 with Iron Oxide cement)
sedimentary