Sulphur Hole, Borate, Calico District, Calico Mts, San Bernardino Co., California, USA

The area is at the south wall of Mule Canyon, 4 miles northeast of Yermo, San Bernardino County.
Sulfur Hole consists of a columnar pipe that formed by ascending iron-bearing acidic hot fluids acting on the underlying volcanic rocks.
http://www.baymin.org/Pubs/SulfurHole.pdf

Mineral List:

	Alum-(K)

	Anhydrite

	Botryogen

	Copiapite

	Coquimbite

	Gypsum

	Halotrichite

	Krausite (TL)

	Marcasite

	Melanterite

	Metavoltine

	Quenstedtite

	Römerite

	Sulphur

	Voltaite

15 entries listed. 15 valid minerals. 1 type locality (valid mineral).

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