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In 1870 he entered the Jesuit Training College at the old abbey of Maria Laach in the Eifel, and there, while engaged in studying philosophy and science, he became interested in the geology of the district, and especially in the volcanic rocks.
Amygdule, a mineral filled vesicle in volcanic rock, amygdaloidal texture
The discovery of very hard volcanic rock at this ridge led to the naming: Gandalf, after a crusty character (a wizard) in J. R. R. Tolkien's The Lord of the Rings.
Guruguru Mountain is a solid dome-shaped volcanic rock in Shurugwi, Zimbabwe, near Pakame Mission.
Helenite, also known as Mount St. Helens obsidian, emerald obsidianite, and ruby obsidianite, is a synthetic gemstone made from the fused volcanic rock dust from Mount St. Helens.
The documents required to claim Stevens' assets and assume his identity are in a safe deposit box in a Portland bank; the key to the box is hidden under a black volcanic rock along a rock wall lining a hay field in the small town of Buxton, not far from Shawshank.
The volcanic rock of the moor of Carnedd Meibion Owain, the mossy boulders and gnarled oaks of Tŷ Canol Wood and the nearby presence of the Pentre Ifan burial chamber contribute to the reserve's prehistoric atmosphere.