Formula: Pb₇Cu₂(SO₄)₄(SiO₄)₂(OH)₂

Species: Sulfates

Colour: Light green, yellow or bright yellowish-green.

Lustre: Vitreous

Specific Gravity: 6.45

Crystal System: Monoclinic

Name: Named in 1950 by John Joseph Fahey, E. B. Daggett and Samuel George Gordon in honour of Edgar Theodore Wherry (1885 – 1982), mineralogist and plant ecologist; President of the Mineralogical Society of America (1923).

Type Locality: Mammoth-Saint Anthony Mine, St. Anthony deposit, Tiger, Mammoth Mining District, Pinal County, Arizona, USA