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Basalt, showing typical diabasic structure of lath-shaped crystals of plagioclase.

Basalt

Basalt, showing typical diabasic structure of lath-shaped crystals of plagioclase.

Devil's Wall (Teufelsmauer) near Oschitz, Bohemia. A basaltic dike.

Devil's Wall

Devil's Wall (Teufelsmauer) near Oschitz, Bohemia. A basaltic dike.

"Diabantite, ore material, and agate in vesicle of main basalt. The radial mass occupying the center is diabantite, the opaque material surrounding it is magnetite or ilmenite, and the outer rim is agate." -Walcott, 1901

Diabantite

"Diabantite, ore material, and agate in vesicle of main basalt. The radial mass occupying the center…

Marmorization of chalk beds by basalt. Island of Rathlin on coast of Antrim, Ireland.

Marmorization of Chalk Beds

Marmorization of chalk beds by basalt. Island of Rathlin on coast of Antrim, Ireland.

An illustration of section of mine from the Kimberley Mine located in South Africa.

Kimberley Mine Section

An illustration of section of mine from the Kimberley Mine located in South Africa.

"Egyptian Statue in black basalt. Heroic size, in the British Museum." —D'Anvers, 1895

Egyptian statue

"Egyptian Statue in black basalt. Heroic size, in the British Museum." —D'Anvers, 1895

Section of volcanic plug (basalt) in chalk. Coast of Antrim, Ireland.

Volcanic Plug

Section of volcanic plug (basalt) in chalk. Coast of Antrim, Ireland.