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

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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)
Alunite
Anhydrite
Botryogen
Copiapite
Coquimbite

Fibroferrite
Gypsum
Halotrichite
Jarosite
Krausite (TL)
Marcasite

Melanterite
Metavoltine
Quenstedtite
Römerite
Sulphur
Voltaite

18 entries listed. 18 valid minerals. 1 type locality (valid mineral).

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