Granite
Granite (Phaneritic Quartz-Feldspar Rock)
igneous
Category
Not A Rock
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Sandstone (likely Arkose or Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Basalt with Quartz/Calcite Veins
Aphanitic Mafic Igneous Rock with Hydrothermal Veining
igneous
Diorite
Phaneritic Intrusive Igneous Rock (Intermediate Composition)
igneous
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Sandstone (Ferruginous)
Arenite with Iron-Oxide cement
sedimentary
Lake Superior Agate
Chalcedony (SiO2 with iron impurities)
mineral
Quartzite with Hematite staining
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Limestone with Fossil Imprints
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Ferruginous Sandstone
Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Arenite (with Iron Oxide cement)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Amygdaloidal Basalt with Epidote/Chlorite
Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))
igneous
Quartzite (River Cobble)
Metamorphic Quartz-rich Rock
metamorphic
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Granite (Leucogranite)
Felsic Plutonic Rock (Granite)
igneous
Granite Pebble with Quartz/Mafic Vein
Felsic Igneous Rock (Granitic)
igneous
Granite
Plutonic Granite
igneous
Eclogite
Eclogite (Omphacite + Almandine-Pyrope Garnet)
metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral / metamorphic
Quartz Vein in Host Rock (Breccia/Rhyolite)
Silicon Dioxide (SiO2) with matrix
Mineral in Igneous/Sedimentary host
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone
Sandstone (Silicon Dioxide, SiO2)
sedimentary
Basalt with Feldspar phenocrysts
Aphanitic to Porphyritic Mafic Volcanic Rock
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Sandstone (Ferruginous)
Arenite (Fe2O3 enriched)
sedimentary
River Cobble (likely Basalt)
Mafic Igneous Rock (Aphanitic)
Igneous
Flowerstone
Porphyritic Basalt or Porphyritic Andesite
igneous
Chert (Iron-rich River Pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary
Greywacke (River Pebble)
Dirty Sandstone (SiO2 with lithic fragments)
sedimentary
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary