Granodiorite / Granite
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
Category
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
Granodiorite / Granite
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
Banded Sandstone (River Cobble)
Arenite Sandstone with heavy mineral layering
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
Sandstone (Banded)
Clastic sedimentary rock (primarily SiO2)
Obsidian
Volcanic Glass (70-75% SiO2 with MgO and Fe3O4)
Serpentine
Serpentinite (group of minerals including Antigorite, Lizardite, or Chrysotile) (Mg, Fe)3Si2O5(OH)4
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
Quartz Mineral Specimens
Quartz (Silicon Dioxide, SiO2)
Note: The image provided is a fabric sock, not a geological specimen.
Polyester-Cotton Blend with Elastane
Sandstone
Arenite (general term for sandstone)
Pyrite
Iron Sulfide (FeS2)
General river rock or weathered cobble
Mixed rock composition
Sandstone
Arenite (primarily SiO2)
Sandstone (with Concretion)
Arenite / Quartzose Sandstone
Bornite
Bornite (Cu5FeS4)
Sandstone
Arenite (Clastic Sedimentary Rock)
Diamond
Diamond (C)
Yellow Jadeite
NaAlSi2O6 (Sodium Aluminum Silicate)
Banded Sandstone (River Pebble)
Arenite (SiO2 primarily)
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
Gneiss
Gneiss (High-grade metamorphic rock)
Fluorite (Fluor-spar)
Calcium Fluoride (CaF2)
Milky Quartz
Silicon Dioxide (SiO2)
Sandstone
Arenite (primarily SiO2)
Peridotite (Olivine/Peridot)
Peridotite (comprising (Mg,Fe)2SiO4)
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
Native Silver
Silver (Ag)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Larimar
Blue Pectolite (NaCa2Si3O8(OH))
Sandstone
Arenite
Sandstone
Arenite (SiO2 principal)
Limonite (Iron Stone Concretion)
Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O
Sandstone
Arenite (SiO2 primarily)
Sandstone
Arenite (primarily SiO2)
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
Porphyritic Pink Granite
Phaneritic Porphyroid Granite
Sandstone (likely Graywacke or Lithic Arenite)
Clastic sedimentary rock predominantly composed of silicate grains
Shale
Shale
Geode or Concretion
Silica-filled nodule (likely SiO2)
Quartz Geode
Silicon Dioxide (SiO2) within a geode