Basalt (River Cobble)
Basalt (Mafic volcanic rock)
Category
Browse mineral on igneous rock specimens identified by the Rock Identifier community.
Basalt (River Cobble)
Basalt (Mafic volcanic rock)
Diorite (River Cobble)
Intermediate Phaneritic Plutonic Rock
Granite
Granite (Felsic Plutonic Rock)
Granite
Granite (Felsic Plutonic Rock)
Basalt (Water-worn pebble)
Basalt (Mafic Extrusive Rock)
Scoria (Lava Rock)
Scoria (vesicular basaltic rock)
Basalt
Basalt (Mafic volcanic rock)
Dacite
Dacite (Intermediate volcanic rock)
Granite
Granite (Felsic Plutonic Rock)
Basalt
Basalt (Mafic volcanic rock)
Basalt
Basalt (Mafic volcanic rock)
Basalt (River Pebble)
Basalt (extrusive mafic rock)
Andesite
Andesite (intermediate volcanic rock)
Granite
Granite (Felsic Plutonic Rock)
Basalt
Mafic volcanic rock (Basalt)
Basalt
Basalt (Mafic volcanic rock)
Pink Granite
Granite (Felsic Plutonic Rock)
Pink Granite
Granite (Felsic Plutonic Rock)
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
Rough Agate/Chert Nodules
Cryptocrystalline Quartz (SiO2)
Schist
Schist
Orange Calcite
Calcium Carbonate (CaCO3)
Blue Calcite
Calcium Carbonate (CaCO3)
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
Labradorite (Larvikite variety)
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8 with Monzonite/Syenite matrix
Bumblebee Jasper
Volcanic Tuff (mixture of Quartz, Sulfur, Hematite, and Orpiment)
Calcite (Banded Calcite / Onyx Marble)
Calcium Carbonate (CaCO3)
Magnetite (likely in Hematite or Ironstone)
Magnetite (Fe3O4)
Yellow Calcite
Calcium Carbonate (CaCO3)
N/A (Non-Geological Object)
Quartz (likely macrocrystalline variety)
Quartz (SiO₂)
Sandstone
Arenite (SiO2 predominantly)
Sandstone (Wonderstone)
Arenite (composed primarily of SiO2 with Fe2O3 impurities)
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
Sandstone (Banded Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with iron oxide impurities)
River Rock (Basalt)
Basalt (SiO2 range: 45-52%)
Pumice (Volcanic Rock)
Vesicular volcanic rock (composed largely of amorphous volcanic glass)
Basalt with Quartz Veining
Basalt (Mafic Volcanic Rock with SiO2)
Basalt
Mafic Volcanic Rock (Primarily Plagioclase feldspar and Pyroxene)
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt or Porphyritic Andesite
Basalt with Quartz Veins
Vesicular or aphanitic Basalt with SiO2 (Quartz) intrusions
Pumice
Vesicular volcanic glass