Quartz Vein in Basalt or Mafic Rock
Silicon Dioxide (SiO2) vein in volcanic/mafic matrix
igneous
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Basalt (with Iron Staining)
Mafic Igneous Rock
igneous
River Pebble (likely Quartzite or Chert)
Sedimentary Clast (Silicon Dioxide dominant)
sedimentary
Orbicular Jasper (Ocean Jasper)
Silicon Dioxide (SiO2) with various inclusions
mineral
Sandstone Cobble
Clastic Sedimentary (Sandstone)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Chert / Chalcedony (likely carnelian or flint variety)
Silicon Dioxide (SiO2)
sedimentary
Peridotite
Ultramafic intrusive igneous rock
igneous
Quartz Pebble (with Iron Staining)
Crystalline Silicon Dioxide (SiO2)
mineral
Schist
Schist (metamorphic rock)
metamorphic
Pahoehoe Basalt
Extrusive mafic volcanic rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive igneous rock
igneous
Crushed Stone (Basalt/Gabbro)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Mixed River Pebbles (including Unakite and Jasper)
Polymineralic geological specimens
igneous and sedimentary
River Cobble (Basalt or Sandstone)
Weathered Basalt or Fine-Grained Sandstone
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Quartz Pebble (Geode Fragment / Druzy Cavity)
Silicon Dioxide (SiO2)
mineral
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
mineral
Basalt
Mafic extrusive volcanic rock (composed primarily of Plagioclase feldspar and Pyroxene)
igneous
Black Limestone with Calcite Veining
Bituminous Limestone (CaCO3 with Organic Carbon inclusions)
sedimentary
Sandstone (Ferruginous)
Sandstone (primarily SiO2 with iron oxide Fe2O3 staining)
sedimentary
Fossils in Limestone (Crinoid / Marine Invertebrate Fossil)
Fossiliferous Limestone (containing Crinoidea / Brachiopoda)
fossil
Quartz-Veined Sandstone
Quartz-veined Arenite
sedimentary
Limestone (River Pebble)
Calcium Carbonate (CaCO3)
sedimentary
Limestone (Weathered Pebble)
Calcium Carbonate (CaCO3) / Limestone
sedimentary
Druzy quartz geode
Microcrystalline quartz (SiO₂), commonly lining a volcanic geode cavity
mineral
Carnelian Agate / Iron-Stained Quartz
SiO2
Mineral
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Mineral
Limestone (specifically Travertine or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Gabbro or Diorite with Quartz/Epidote Vein
Intrusive Igneous Rock (Plutonic)
igneous
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in Geodic habit
mineral
Yellow Quartzite
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Quartz Geode with Calcite
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
mineral
Peridotite (Pyroxenite/Serpentinized Dunite)
Ultramafic Rock (consisting primarily of Olivine and Pyroxene)
igneous
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Puddingstone (Gowganda Tillite/Jasper Conglomerate)
Jasper Conglomerate (SiO2 primary composition)
sedimentary