Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Category
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Granite
Phaneritic Intrusive Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Basalt
Basalt (silicate rock primarily plagioclase and pyroxene)
igneous
Basalt
Basalt
igneous
Basalt
Basalt (Extrusive Mafic Igneous)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Basalt
Basalt (containing plagioclase feldspar, pyroxene, and olivine)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Quartz Vein in Sandstone
Quartz (SiO2) in Clastic Sedimentary Rock
sedimentary
Green Apophyllite and Stilbite on Quartz Cluster
Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)
Mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Mixed river-worn rock and mineral collection
Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble
igneous, sedimentary, metamorphic, mineral
Granite
Intrusive Igneous Rock
igneous
Sandstone Pebble
Sandstone (primarily SiO2)
sedimentary
Weathered granitoid (likely granite or granitic gneiss)
Granite; chiefly quartz, feldspar, and mica (exact identification uncertain from the photo)
igneous
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Basalt Pebble
Mafic Igneous Rock
igneous
Basalt
Mafic volcanic rock
igneous
Basalt River Stone
Basaltic Igneous Rock
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Basalt
Basalt
igneous
Pumice
Pumice (Volcanic glass / Felsic igneous rock)
igneous
Vesicular Basalt
Extrusive mafic igneous rock (Basalt with vesicular texture)
igneous
Dalmatian Jasper
Peralkaline Quartz-feldspathic Rock (Arfvedsonite-bearing)
igneous
Porphyritic Basalt (Chinese Flower Stone / Chrysanthemum Stone basalt variety)
Porphyritic Basalt containing Plagioclase Feldspar phenocrysts
igneous
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