Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
Category
Browse metamorphic rock (variety of quartz) specimens identified by the Rock Identifier community.
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
Ferruginous Sandstone
Arenite with Hematite/Limonite cement (SiO2 + Fe2O3)
Gneiss
Gneiss (quartz-feldspar-biotite gneiss)
Quartzite
Quartzite (primarily SiO2)
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Granitic Gneiss
Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)
Quartzite
Quartzite (SiO2 silicon dioxide)
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
Amethyst Sage Agate
Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)
Green Aventurine
Aventurine (a variety of Quartz, SiO2 with fuchsite inclusions)
Quartzite
Quartzite (SiO2)
Red Quartzite / Ferruginous Quartzite
Quartzite (primarily SiO2 with Fe2O3 inclusions)
Conglomerate
Conglomerate (clastic sedimentary rock)
Jasper with Quartz inclusion
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Anthracite Coal
Anthracite (Carbon-based sedimentary rock typically classified as metamorphic)
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
Conglomerate
Conglomerate Rock (Paraconglomerate)
Red Quartzite (Tumbled Pebble)
Quartzite (primarily SiO2 with hematite inclusions)
Gneiss (Granite Gneiss)
Gneiss
Quartzite (specifically a river-worn cobble)
Quartzite (primarily Silicon Dioxide, SiO2)
Chert (Chert Nodule with Cortex)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
Quartzite (River Pebble)
Quartzite (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Quartzite
Quartzite (primarily SiO2)
Quartzite
Quartzite (primarily SiO2)
Quartzite
Quartzite (primarily SiO2)
Quartzite
Quartzite (SiO2)
Quartzite Pebble
Quartzite (primarily SiO2)
Quartzite river pebble
Quartzite (SiO2)
Chalcedony (Botryoidal Agate vein)
Chalcedony (Microcrystalline Quartz) - SiO2
Vesicular Basalt with Mineral Inclusions
Vesicular Basalt
Gneiss (specifically Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
Sandstone (Micaceous)
Arenite (primarily SiO2 with Phyllosilicates)
Red Granite
Phaneritic Plutonic Felsic Rock (rich in Potassium Feldspar)
Gneiss
Gneiss
Chert (Jasper/Flint Pebble)
Microcrystalline quartz (SiO2)
Gneiss Pebble
Gneiss
Chert (Septarian or Banded Nodular Variety)
Microcrystalline Quartz (SiO2)
Diamond Drill Core (Greenschist and Quartzite)
Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)
Chert / Jasper / Agate (Chalcedony Group)
Microcrystalline Quartz (SiO2)