Basalt

Amygdaloidal Basalt

Amygdaloidal Mafic Volcanic Rock

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Amygdaloidal Basalt

Amygdaloidal Basalt (Ca-rich Plagioclase, Pyroxene, and Olivine)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Volcanic Rock)

Amygdaloidal Basalt

Amygdaloidal Mafic Volcanic Rock (Basalt)

Amygdaloidal Basalt

Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with secondary mineral infilling)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive volcanic rock)

Basalt (Vesicular)

Basalt (Mafic Extrusive Igneous Rock)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)

Basalt (Vesicular)

Extrusive mafic igneous rock; primarily (Ca, Na)(Mg, Fe, Al)(Si, Al)2O6 with (Ca, Na)(Al, Si)4O8

Amygdaloidal Basalt

Vesicular Basalt with secondary mineral infilling (commonly Zeolites, Calcite, or Quartz)

Amygdaloidal Basalt

Vesicular-Amygdaloidal Basalt (Mafic Extrusive)

Wishing Stone (Basalt with Quartz Vein)

Basalt containing a microcrystalline quartz (SiO2) or calcite vein

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Porphyritic Basalt (Chinese Writing Stone)

Porphyritic Basalt with Feldspar Phenocrysts

Vesicular Basalt

Basalt (Extrusive Igneous Rock)

Basalt with inclusion

Basalt (Aphanitic-Porphyritic texture)

Basalt (Vesicular and Scoria)

Basalt (extrusive volcanic rock)

Basalt (Drill Core)

Mafic Volcanic Rock (Basalt)

Basalt with Epidote Veins

Mafic Igneous Rock (Basalt)

Olivine (Peridot when gem-quality)

Olivine Group (Magnesium Iron Silicate, (Mg,Fe)2SiO4)

Basalt with Scoria/Vesicular Texture

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Granodiorite

Granodiorite (intermediate plutonic rock)

Basalt (with possible mineral veining)

Basalt (Aphanitic Mafic Igneous Rock)

Basalt River Stone

Aphanitic Mafic Igneous Rock

Basalt (River-worn Specimen)

Extrusive Mafic Igneous Rock

Diabase

Diabase (also known as Dolerite)

Basalt (River Rock Cobble)

Extrusive mafic volcanic rock (Basalt)

Basalt (Polished River Stone)

Mafic Volcanic Rock (primarily Plagioclase and Pyroxene)

Basalt with Quartz Veins

Basalt (composition: SiO2, MgO, FeO, Al2O3, CaO)

Basalt River Stone

Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt (Beach Pebble)

Extrusive mafic igneous rock

Basalt Pebble

Extrusive mafic igneous rock

Basalt (Road Gravel)

Aphanitic mafic volcanic rock (various compositions of plagioclase feldspar and pyroxene)

Basalt (Crushed Roadstone)

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Granodiorite Pebble

Granodiorite (containing Quartz, Plagioclase Feldspar, and Biotite/Amphibole)

Basalt (Weathered/River worn)

Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)

Basalt (River Pebble)

Extrusive mafic igneous rock

Basalt (Water-worn Pebble)

Mafic Volcanic Rock (High in Fe and Mg)

Basalt (Polished pebble)

Basalt (Aphanitic mafic volcanic rock)

Basalt River Stone

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)