Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Category
Mineral In A Matrix (Likely Quartz Or Feldspar)
Browse mineral in a matrix (likely quartz or feldspar) specimens identified by the Rock Identifier community.
Amygdaloidal Basalt
Amygdaloidal Basalt (Ca-rich Plagioclase, Pyroxene, and Olivine)
igneous
Quartz (Quartzite fragment)
Silicon Dioxide (SiO2)
mineral
Geode with Iron-Stained Quartz/Calcite
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix
sedimentary
Quartz Geode in Sedimentary Matrix
Silicon Dioxide (SiO2) within a limestone/dolostone host
mineral
Feldspar Granodiorite
Granodiorite (Na,Ca)(Si,Al)4O8
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Granite
Granite (Phaneritic Igneous Rock / Quartz, Feldspar, Mica)
igneous
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Gneiss (Cobble)
Gneiss
metamorphic
Granite
Phaneritic Plutonic Rock (Granite)
igneous
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Mineral/Mineraloid within a rock matrix
Granite (with Almandine Garnet inclusions)
Granite composed primarily of Quartz (SiO2), K-Feldspar (KAlSi3O8), and Almandine Garnet (Fe3Al2(SiO4)3)
igneous
Conglomerate
Conglomerate Rock (Paraconglomerate)
sedimentary
Granite Sand (Decomposed Granite)
Grus / Quartz-Feldspar Detritus
sedimentary
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Amygdaloidal Basalt
Amygdaloidal Mafic Volcanic Rock
igneous
Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)
Mafic volcanic rock (formula primarily (Mg, Fe)2SiO4 and CaAl2Si2O8)
igneous
Blue Quartzite
Quartzite (specifically a variety enriched with blue-coloring minerals)
Metamorphic Rock
Milky Quartz with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Hematite/Limonite) inclusions
mineral
Granite
Granite (Phaneritic Quartz-Feldspar Rock)
igneous
Granite
Granite
igneous
Basalt with Amygdules
Amygdaloidal Basalt
igneous
Granite (Alkali-feldspar Granite)
Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)
Igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Quartz / Iron-Stained Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions/staining
mineral
Unakite
Unakite (Epidotized Granite)
metamorphic
Granitic Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)
igneous
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Pallasite Meteorite (likely Imilac or Brenham)
Stony-Iron Meteorite (Pallasite)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Unakite
Epidotized Granite
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Phaneritic Plutonic Igneous Rock (Rich in SiO2)
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Granite
Phaneritic plutonic rock (approx. 20-60% quartz, 35-90% feldspar)
igneous