Porphyritic Basalt (Chinese Flower Stone / Chrysanthemum Stone basalt variety)
Porphyritic Basalt containing Plagioclase Feldspar phenocrysts
igneous
Category
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Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt River Stone
Basalt
igneous
Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Peridotite
Ultramafic igneous rock
igneous
Pink Granite
Plagioclase-Quartz-K-Feldspar Granite
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix
metamorphic
Sandstone (likely Graywacke or Arkosic varieties)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Desert Varnish (on Sandstone)
Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)
sedimentary
Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)
Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein
igneous or sedimentary
Black basalt fragment
Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite Cobble
Granite
igneous
Coarse-grained Granite or Gneiss
Granitic intrusive rock
igneous
Basalt
Mafic Igneous Rock
igneous
Basalt
Mafic Igneous Rock
igneous
Basalt
Basaltic Mafic Rock
igneous
Granite
Plutonic felsic igneous rock
igneous
Granite
Plutonic felsic igneous rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Concretion
Various mineral compositions, typically carbonate or iron oxide cemented sediment
Sedimentary
Granite
Intrusive igneous rock
igneous
Granite
Plutonic Igneous Rock
igneous
Sandstone
Arenite
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Quartz Pebble (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Unidentified gray stone
Likely quartz-rich stone; exact identification is not possible from the image
mineral
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Granite
igneous