sulfur ball

sulfur ball

[′səl·fər ‚bȯl]
(geology)
A bubble of hot volcanic gas encased in a sulfurous mud skin that solidified on contact with air.
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References in periodicals archive ?
Yin et al., "Origin of native sulfur ball from the Kueishantao hydrothermal field offshore northeast Taiwan: Evidence from trace and rare earth element composition," Journal of Asian Earth Sciences, vol.
Using sulfur composition data, they suggested a "glue pudding" growth model to explain the origin of these native sulfur balls. Goff et al.
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