Vesicular Basalt
Vesicular Basalt (Aphanitic Mafic Igneous Rock)
Category
Browse mineral on igneous rock specimens identified by the Rock Identifier community.
Vesicular Basalt
Vesicular Basalt (Aphanitic Mafic Igneous Rock)
Clear Quartz Point
Silicon Dioxide (SiO2)
Quartz
Silicon dioxide (SiO2)
Granite
Granite (Felsic Intrusive Igneous Rock)
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
Granite
Phaneritic Igneous Rock (Granitic)
Gneiss
Gneiss (High-grade metamorphic rock)
Greenstone (Epidote/Chlorite Rich Rock)
Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))
Pegmatite
Coarse-grained Igneous Rock (Granitic Pegmatite)
Dalmatian Stone (commonly called Dalmatian Jasper)
Peralkaline Rock (mixed Feldspar, Quartz, and Arfvedsonite)
Olivine/Peridot
Magnesium Iron Silicate (Mg,Fe)2SiO4
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Sandstone (Micaceous Sandstone)
Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
Basalt with Calcite Veins
Basalt (containing CaCO3 inclusions)
Cloud Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Granite
Phaneritic Felsic Igneous Rock (Granite)
Diorite
Diorite (Intermediate intrusive igneous rock)
Basalt with Secondary Mineralization (Likely Zeolites or Calcite)
Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)
Diorite
Diorite (an intrusive igneous rock)
Diorite
Intermediate plutonic igneous rock
Quartz Crystal
Silicon Dioxide (SiO2)
Quartz / Common Agate
Silicon Dioxide (SiO2)
Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
Snowflake Obsidian
Volcanic glass containing Spherulites (SiO2)
Diorite (with Salt-and-Pepper Texture)
Diorite (Intrusive Igneous Rock)
Hypersthene (or Enstatite/Ferrosilite)
Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)
Sodalite Syenite
Sodalite-bearing Syenite (Na8(Al6Si6O24)Cl2)
Diorite
Intrusive Igneous Rock (Intermediate Composition)
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
Basalt
Basalt (Mafic Extrusive Igneous Rock)
Basalt with Iron Oxidation
Mafic Igneous Rock (Basalt)
Granodiorite
Granodiorite (phaneritic intrusive igneous rock)
Granite
Granite (Phaneritic Acidic Igneous Rock)
Basalt
Extrusive mafic igneous rock
Granite (weathered pebble)
Granite (plutonic igneous rock)
Basalt with Quartz/Calcite Vein
Basalt (Mafic Volcanic Rock with secondary mineralization)
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Granite
Phaneritic Felsic Igneous Rock
Olivine in Basalt matrix
Peridotite (Mg, Fe)2SiO4
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Quartz Crystal Cluster
Silicon Dioxide (SiO2)