Quartz (Tumbled/Water-worn pebble)
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary And Igneous
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Banded Gneiss River Pebble
Gneiss
metamorphic
Gneiss (Metamorphic Rock Pebble)
Foliated Metamorphic Rock (Quartz-Feldspar Gneiss / Granitic Gneiss)
metamorphic
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss (Cobble)
Gneiss
metamorphic
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)
Mineral
Gneiss
Metamorphic Gneiss
metamorphic
Banded Agate (with small Geode cavity)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Carnelian
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Gneiss
Gneiss
metamorphic
Milky Quartz
Quartz (Silica / Silicon Dioxide), SiO2
mineral
Milky Quartz
Quartz (Silica / Silicon Dioxide, SiO2)
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz and Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Banded Chalcedony (Agate)
Chalcedony (SiO2) - Cryptocrystalline Quartz
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Hematite
Iron (III) Oxide (Fe2O3)
mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Black Beach Pebble (Basalt / Slate Pebble)
Rounded Fine-Grained Clastic / Igneous Rock Pebble
sedimentary
Gneiss (Metamorphic Pebble)
Gneiss (SiO2-rich metamorphic rock)
metamorphic
Quartz (with Sandstone/Quartzite rocks)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Metamorphic Gneiss (High-grade regional metamorphism specimen)
metamorphic
Quartz (Grain)
Silicon Dioxide (SiO2)
mineral
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Gneiss
Gneiss
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral