About 50 km. to the S. of Guatemala City there is a lake of volcanic origin, Ixpaco, diameter 300 m., the bottom of which consists of sulfurous mud, containing about 30 to 60% S. Fumarolic activity is still taking place along the shores of the lake, depositing orthorhombic S crystals and pickeringite. The S of the mud is amorphic mu -S, grain size 0.01-0.1 mm. which, exposed to the air, changes into orthorhombic S. The mud S is formed through the action of S bacteria, that transform H 2 S of the fumaroles into S and sulfuric acid, acidifying the lake water to pH 2.3. Total reserves of S mud are estimated at several hundred thousand cubic meters.

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