Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Category
Sedimentary And Igneous
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Gneiss
Gneiss
metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Chalcedony (Agate/Jasper mix in host rock)
Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)
mineral
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Druzy Quartz (on Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss (specifically a Granitic Gneiss)
Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)
metamorphic
Gneiss Pebble
Gneiss
metamorphic
Quartz (Milky/Gravel variety)
Silicon Dioxide (SiO2)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Quartz with Iron Oxide Stain
Silicon Dioxide (SiO2) with Hematite/Limonite coatings
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Foliated Gneiss (River-Worn Pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Feldspathic Gneiss
Feldspathic Gneiss (High-grade regional metamorphic rock)
metamorphic
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
Metamorphic
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz (Crystal Cluster)
Silicon Dioxide (SiO2) - Quartz Variety
mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Carnelian Agate
Silicon dioxide (SiO2) - variety of Chalcedony
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartz (likely tumbled or naturally water-worn)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz (specifically Milky Quartz/Quartzite)
Silicon Dioxide (SiO2)
Mineral
River Rock (Granitic Gneiss)
Foliated Granitic Gneiss
metamorphic
Pyrite
Pyrite (FeS2)
Mineral
Veined Quartz
SiO2 (Silicon Dioxide)
Mineral
Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)
Quartz (SiO₂)
Mineral
Quartz
Quartz (SiO₂)
Mineral
Black Obsidian and Hematite
Volcanic Glass (SiO2) and Hematite (Fe2O3)
igneous and mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Yellow Chalcedony (Carnelian/Yellow Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
Blue-dyed Quartz Druzy
Silicon Dioxide (SiO2) with artificial pigment
mineral