Sandstone
Clastic sedimentary rock (Quartz arenite or Arkose)
Category
Browse mineral like byproduct (technogenic) specimens identified by the Rock Identifier community.
Sandstone
Clastic sedimentary rock (Quartz arenite or Arkose)
Gneiss (Augen Gneiss)
Augen Gneiss
Quartzite with Dendritic Manganese Oxide Inclusions
Metamorphic Quartzite (SiO2 with Mn-oxides)
Tumbled Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
Sandstone
Arenite (SiO2 based)
Coarse-grained Quartz and Feldspar Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8)
Tufa
Calcareous Tufa (Calcium Carbonate, CaCO3)
Satin Spar (often sold as Selenite)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
Petrified Wood
Silicified wood (principally SiO2)
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Rose Quartz
Silicon Dioxide (SiO2)
Gneiss
Metamorphic rock (Gneiss)
Green Calcite
Calcium Carbonate (CaCO3)
Quartz Pebble
Silicon Dioxide (SiO2)
Porphyritic Basalt (with Amygdales)
Amygdaloidal Porphyritic Basalt
Sandstone (Water-worn Cobble)
Arenite (SiO2 with CaCO3 or Fe2O3 cement)
Basalt with Iron Oxide staining
Basalt (Mafic volcanic rock)
Sandstone
Clastic Sedimentary Rock
Sandstone
Sedimentary rock composed mainly of quartz sand grains
Quartz
Silicon Dioxide (SiO2)
Green Aura Quartz (Titanium treated Kyanite or Quartz)
Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating
Orange Calcite
Calcite (CaCO3)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
Hematite Mineral Ore
Iron(III) oxide (Fe2O3)
Sandstone
Arenite (SiO2 primarily)
Vesicular Basalt
Extrusive mafic igneous rock (Basalt with vesicular texture)
Kimberlite
Kimberlite (Potassic ultramafic volcanic rock)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Garnet (likely Almandine or Pyrope)
Garnet (Group Name), Fe3Al2(SiO4)3 or Mg3Al2(SiO4)3
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Basalt
Basalt
Basalt (Amygdaloidal)
Amygdaloidal Basalt
Conglomerate
Conglomerate (clastic sedimentary rock)
Peach Aventurine
Silicon Dioxide (SiO2) with inclusions
Agate with Druzy Quartz
Silicon Dioxide (SiO2)
Basalt
Extrusive Igneous Rock
Inukshuk Rock Sculpture (composed of Granite, Slate, and Amethyst)
Silicon Dioxide (Amethyst portion, SiO2) with mixed silicate rock assemblage
Spinel
Magnesium aluminum oxide (MgAl2O4)
Sandstone
Clastic sedimentary rock (Quartz arenite / Arkose)
Pegmatite with Mica
Granitic Pegmatite (containing Muscovite and Biotite)
Petrified Wood
Silicified Wood (primarily SiO2)