Granite
Granite (Felsic Plutonic Rock)
igneous
Category
Not A Rock
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Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Basalt
Extrusive mafic igneous rock
igneous
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Granite
Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)
igneous
Banded River Cobble with Mafic Dike
Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion
igneous and sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Micaceous Sandstone)
Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)
sedimentary
Quartz Veinated Sandstone or Siltstone
Silicon Dioxide (SiO2) within a clastic sedimentary matrix
sedimentary
Painted Sandstone Cobble
Clastic Sedimentary Rock (Sandstone base)
sedimentary
Lapis Lazuli
Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Basalt
Basalt (Mafic igneous rock)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Granular Sandstone
Arenite (variable composition, primarily SiO2)
sedimentary
Red Sandstone
Arenite with Iron Oxide (Hematite) cement
sedimentary
Thunderegg (Agate-filled Geode Node)
Silicon dioxide (SiO2) with various inclusions
sedimentary/igneous association
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Limestone (Micritic)
Sedimentary rock mainly composed of Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Arenite
sedimentary
Granite
Granite (composed mainly of Quartz, Feldspar, and Mica)
igneous
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (Iron-rich)
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Sandstone
Arenite (SiO2 based typically)
sedimentary
Sandstone
Arenite (typically SiO2 based)
sedimentary
Sandstone (with potential Concretion or Fossil fragment)
Arenite (primarily SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Iron Concretion
Ferruginous concretion (Fe2O3·nH2O / FeO(OH))
sedimentary
Crinoid Stem Fossil
Class Crinoidea (Sea Lilies)
sedimentary
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Sandstone (Quartzite Pebble)
Arenite (primarily SiO2)
sedimentary
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Limonite streaks)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2) with miscellaneous inclusions
mineral
Milky Quartz Pebble (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
mineral / metamorphic
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral