Gneiss
Gneiss
metamorphic
Category
Igneous, Sedimentary, Metamorphic, Mineral
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Gneiss
Gneiss
metamorphic
Quartz (likely Jasper or Chert variety)
Quartz (SiO₂)
Mineral
Amphibolite / Biotite Schist
Amphibolite (rich in Hornblende and Plagioclase feldspar)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Banded Gneiss with Quartz Vein
Foliated Metamorphic Rock (Gneiss)
metamorphic
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Granitic Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartz
Silicon Dioxide (SiO2)
Mineral
Banded Gneiss with Quartz Vein
Gneiss containing SiO2 (Quartz) intrusion
metamorphic
Mixed collection of natural stones
Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks
igneous, metamorphic, sedimentary
Gneiss
Gneiss
metamorphic
Epidote-bearing Rock
Epidote / Silicate mineral aggregate
metamorphic
Gneiss
Gneiss
metamorphic
Rock crystal quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Yellow Sapphire or Citrine
Al2O3 (Corundum) or SiO2 (Quartz)
mineral
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Green Aventurine and Clear Quartz
Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)
Mineral
Gneissic Schist
Foliated Metamorphic Rock (Schist/Gneiss transition)
metamorphic
Gneiss
Gneiss
metamorphic
Schist (Chlorite or Mica-rich)
Chlorite Schist
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
igneous
Gneiss
Gneiss
metamorphic
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Chalcedony (SiO2)
sedimentary
Gneiss
Metamorphic rock (Gneiss)
metamorphic
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Gneiss
Gneiss
metamorphic
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Gneissic River Cobble
Gneiss
metamorphic