Alunite

GEOTHERMAL ENERGY

Alunite:

A hydrated aluminum, potassium, sulfate mineral often found around fumaroles

Other definitions:Wikipedia Reegle

Relict Geothermal Features

Typical list of modern geothermal features

• Hydrothermally Deposited Rock

• Silica Deposition
• Carbonate Deposition
• Alunite
• Other Hydrothermal Deposits

• Hydrothermally Altered Rock

• Silicification
• Argillic-Advanced Argillic Alteration
• Zeolitic Alteration
• Leach Capping
• Other Hydrothermal Alteration Products

Alunite crystals from the Zemplén Mtns, Hungary. Photo by Harold Moritz 2012. http://www.mindat.org/photo-453442.html

Alunite is a potassium sulfate mineral that forms in acid-vapor dominated hydrothermal systems. It is commonly encountered as an alteration mineral in high sulfidation epithermal gold deposits formed from acid-sulfate solutions and in areas with past fumarolic activity.

Examples

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