Igneous And Sedimentary

Granite / Gneiss (Felsic Metamorphic or Igneous Rock)

Gneiss (or weathered Granite)

Banded Gneiss

Gneiss (Metamorphic rock)

Gneiss

Gneiss

Gneiss

Metamorphic Gneiss (High-grade regional metamorphism)

Banded Gneiss with Quartz Vein

Gneiss containing SiO2 (Quartz) intrusion

Quartz (Crystalline Cluster)

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss

Foliated Metamorphic Gneiss

Gneiss (Metamorphosed Pebble)

Gneiss with Quartz/Feldspar banding

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss

Gneiss

Gneiss

Gneiss (Metamorphic high-grade)

Gneiss (River Cobble)

Gneiss (Foliated Metamorphic Rock)

Banded gneiss pebble

Gneiss, likely quartz–feldspar–mica gneiss

Gneiss

High-grade Metamorphic Gneiss

Gneiss

Metamorphic Gneiss

Carnelian

Silicon Dioxide (SiO2) - variety of Chalcedony

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss (Banded Gneiss)

Gneiss

Bloodstone Jasper (Heliotrope)

SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz

Banded gneiss

Gneiss, likely biotite–quartz–feldspar gneiss

Banded metamorphic rock, likely gneiss or banded amphibolite

Undetermined foliated metamorphic rock; commonly quartz–feldspar–biotite gneiss or amphibolite

Banded Gneiss

Metamorphic Gneiss (High-grade regional metamorphism specimen)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Quartz Druze on Matrix (Geode Fragment)

Quartz (Silicon Dioxide, SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss (High-Grade Metamorphic Rock)

Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Carnelian

Carnelian (SiO2, Silicon Dioxide with Iron Oxide impurities)

Gneiss (specifically a Banded Gneiss cobble)

Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)

Gneiss

Gneiss

Banded gneiss (likely weathered paragneiss)

Gneiss; quartz–feldspar–mica ± amphibole assemblage

Banded metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss, possibly amphibolite-bearing

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss (Schistose)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss (Metamorphic silicate rock)

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Carnelian

Cryptocrystalline Quartz (SiO2 with iron oxide impurities)

Banded Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Gneiss (High-grade regional metamorphic rock)