Granite Gneiss
Gneiss (High-grade regional metamorphic rock)
Metamorphic
Category
Mineral On Igneous Rock
Browse mineral on igneous rock specimens identified by the Rock Identifier community.
Carnelian
Carnelian (a variety of Chalcedony); SiO2 (Silicon Dioxide)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian
Carnelian Chalcedony (SiO2 with Iron Oxide impurities)
mineral
Granite
Phaneritic Plutonic Felsic Rock
igneous
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Thunderegg (specifically a Jasper/Agate-filled Geode nodule)
Silicon Dioxide (SiO2) within Rhyolitic Matrix
igneous
Carnelian
Carnelian (Microcrystalline Quartz, SiO2)
mineral
Basalt
Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)
igneous
Granite
Granite (composed primarily of Quartz SiO2 and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8))
igneous
Basalt with Iron Oxidation
Aphanitic Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)
igneous
Amethyst and Ruby in Zoisite
Silicon Dioxide (SiO2) and Anyolite (Zoisite-Hornblende-Ruby mix)
mineral and metamorphic rock
Basalt with Quartz/Feldspar Inclusion
Basalt (containing Silicate minerals such as SiO2 and (Ca,Na)(Al,Si)4O8)
igneous
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Porphyritic Basalt (with Amygdales)
Amygdaloidal Porphyritic Basalt
igneous
Basalt
Extrusive Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Quartz (likely a form of massive or vein quartz)
Quartz (SiO₂)
Mineral
Diorite Gneiss
Foliated Diorite Gneiss
metamorphic
Greenstone
Greenschist / Greenstone (containing Chlorite, Epidote, Actinolite)
metamorphic
Vesicular Basalt
Mafic Volcanic Rock (Basalt)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gold Ore
Native Gold (Au) in Matrix
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Amygdaloidal Basalt with Secondary Minerals
Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Vesicular Basalt with Xenocrysts
Mafic Igneous Plutonic/Extrusive Complex
igneous
Gneiss (specifically a weathered or stream-worn specimen)
Gneiss (Foliated Metamorphic Rock)
metamorphic
Diorite (Salt and Pepper Rock)
Diorite
igneous
Dragon Vein Agate
Chalcedony (Quartz) - SiO2
mineral
Diorite
Phaneritic intermediate plutonic rock
Igneous
Pyrite (on Shale/Matrix)
Iron Disulfide (FeS2)
mineral
Granodiorite
Granodiorite (containing Quartz, Plagioclase, Orthoclase, Biotite/Hornblende)
igneous
Olivine (Peridotite)
(Mg, Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Biotite Schist
Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Wonderstone
Rhyolite (Silicon Dioxide with Iron Oxide impurities)
igneous
Quartz Pebble (with probable inclusions or staining)
Quartz (Silicon Dioxide - SiO2)
mineral
Gneiss
Gneiss
metamorphic