Yellow Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Category
Biogenic Material
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Sandstone (Calcareous/Lithic)
Sedimentary Rock (Clastic Sandstone with Calcium Carbonate cement)
sedimentary
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Quartz (Common or Milky Quartz) with Iron Staining
Silicon Dioxide (SiO2)
mineral
Yellow Quartzite (Citrine-colored Quartz)
Silicon Dioxide (SiO2) with iron oxide inclusions
metamorphic
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Jasper Conglomerate
Polymictic Conglomerate (Quartz and Jasper clasts in a quartz-rich matrix)
sedimentary
Yellow Jasper
SiO2 (Microcrystalline Quartz)
mineral
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Green Greenstone / Celadonite-bearing Metamorphic Rock
Greenschist / Celadonite / Serpentinitic pebble
metamorphic
Unakite
Metamorphosed Granite (Epidotized Feldspar and Quartz)
metamorphic
Agate (Carnelian / Fire Agate nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Granite / Diorite (Granitoid)
Granitoid rock (composed mainly of Quartz, Feldspar, and Amphibole/Biotite)
igneous
Basalt (Beach Pebble) / Black Chert
Basalt / Microcrystalline Quartz (SiO2)
igneous
Carnelian / Chalcedony
Silicon Dioxide (SiO2)
mineral
Banded Serpentinite (Beach Pebble)
Serpentine-group silicate rock ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe,Al)2O5(OH)4)
metamorphic
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Quartz-veined Greywacke
Silicon dioxide (SiO2) in Lithic Sandstone
sedimentary
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone Pebbles
Arenite (primarily SiO2 with mineral cement)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert Conglomerate (Potomac Puddle Stone)
Sedimentary Conglomerate with Iron-Oxide matrix
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Limestone (likely weathered)
Limestone (Mainly Calcium Carbonate, CaCO3)
sedimentary
Orbicular Jasper (Ocean Jasper)
Silica-rich Microcrystalline Quartz (SiO2) with various inclusions
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Clastic sedimentary rock (Arenite)
sedimentary
Citrine Quartz / Yellow Quartz Pebbles
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
River Cobble (Quartzite or Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite Pebble
Metamorphic Rock (chiefly Silicon Dioxide, SiO2)
metamorphic
Septarian Nodule (Pebble)
Septarian concretion (composition: CaCO3, calcite, aragonite, and clay/mudstone)
sedimentary
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Quartz River Pebble
Crystalline Silicon Dioxide (SiO2)
mineral