Quartz (River Pebble) and Chert/Jasper
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Or Igneous
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Gneiss
Gneiss
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (Metamorphic silicate rock)
metamorphic
Quartz with Mica inclusions (likely Schist or Gneiss host)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
metamorphic
Gneiss (with Quartzite and Biotite)
Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)
metamorphic
Botryoidal Chalcedony (Agate/Desert Rose Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Hematite
Ferric Oxide (Fe2O3)
mineral
Dyed Pink Agate Slice
Cryptocrystalline variety of Quartz (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO₂)
mineral
Greenschist
Chlorite schist
metamorphic
Gneissic Schist
Foliated Metamorphic Rock (Schist/Gneiss transition)
metamorphic
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneissic Metamorphic Rock
metamorphic
Rough Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Smoky variant)
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
White Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz (Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Gneiss
Gneiss
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Common Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Cloudy variety)
Silicon Dioxide (SiO2)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite (Cube variety)
Iron Sulfide (FeS2)
mineral
Banded Gneiss
Foliated Gneiss
metamorphic
Calcite
Calcium Carbonate (CaCO3)
mineral