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Butlerite

• 
  Copiapó Province, Atacama Region, Chile
  © 2005 - MMI

• Formula:
  Fe³⁺(SO₄)(OH) · 2H₂O

• System: Monoclinic

• Name:
  Named by Carl Lausen in 1928 in honor of Gurdon Montague "Monty" Butler (March 26, 1881 Lake Geneva, Wisconsin, USA - February 21, 1961 California, USA), mining geologist and professor, University of Arizona. The Butler Mountains of Camino del Diablo, Arizona were also named for Gurdon Montague Butler.

• IMA Status: Valid (Grandfathered)

• Type Locality:
  United Verde Mine (The Big Hole; Big Hole property; Hull Mine; Hopewell tunnel; Patented claim 3480; Patented claim 2812; Patented claims 3348), Jerome, Verde District, Black Hills (Black Hill Range), Yavapai Co., Arizona, USA

• Dana 8th: 31.9.1.1
  
  31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
  9 : (AB)(XO₄)Z_q·xH₂O

• Hardness (Mohs): 2½

• Density: 2.55 g/cm³ (measured)
  2.53 g/cm³ (calculated)

• Lustre: Vitreous

• Diapheny: Translucent

• Colour: Dark orange; light yellow-orange in transmitted light.

• Streak: Pale yellow