Gneiss
Gneiss
Category
Browse mineral with metamorphic or igneous host specimens identified by the Rock Identifier community.
Gneiss
Gneiss
Quartz / Quartzite
Silicon Dioxide (SiO2)
Citrine Quartz
Silicon Dioxide (SiO2)
Citrine Quartz
Silicon Dioxide (SiO2)
Gneiss
Gneiss (High-grade metamorphic rock)
Gneiss
Gneiss
Gneiss
Gneissic Metamorphic Rock
Rough Quartz (likely Rose or Amethyst variety)
Silicon Dioxide (SiO2)
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Rose Quartz
SiO2 (Silicon Dioxide with trace amounts of iron, manganese, or titanium)
Chalcedony (specifically Blue Chalcedony or Common Opal variety)
Silicon Dioxide (SiO₂)
Yellow Chalcedony (Agate/Carnelian variant)
Silicon Dioxide (SiO₂)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Sand Grain (Silica/Quartz Grain)
Silicon Dioxide (SiO2)
Giallo Ornamental Granite
Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)
Gneiss
Gneiss
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
Gneiss (specifically Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Biotite/Amphibole)
Greenstone / Epidosite
Epidosite (Metasomatic rock consisting mainly of Epidite Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz)
Gneiss
Gneiss
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
Yellow Aventurine
Quartz (SiO2) with inclusions
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(OH)2
Shale with Limonite/Hematite Staining
Argillaceous sedimentary rock with Iron Oxides (FeO(OH)·nH2O / Fe2O3)
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
Boulder Opal
Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)
Garnet
Almandine (Fe3Al2(SiO4)3)
Gneiss (with Quartzite and Mica)
Gneiss
Gneiss (Banded Gneiss)
Gneiss
Quartz (Clear/White)
Silicon Dioxide (SiO2)
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
Rough Quartz Crystal in Matrix
Silicon Dioxide (SiO2)
Turquoise
CuAl6(PO4)4(OH)8·4H2O
Gneiss
Gneiss
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
Milky Quartz
Silicon Dioxide (SiO2)
Pyrite
Iron Sulfide (FeS2)
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)