KÖTTIGITE



Koettigite (Köttigite), a zinc arsenate hydrate mineral, was verified by [Dunn] in 1973. It occurs as flattened sprays, up to many cm in size, of prismatic, lustrous crystals. The color may be blue to grayish blue, white, opaque chalky white, or colorless. Partial analyses indicate Sterling Hill koettigite has but 3.3 wt. % MnO, a trace of FeO, and is otherwise zinc arsenate. Koettigite (Köttigite) and/or parasymplesite are locally replaced by yukonite. It is best verified using X-ray methods.
Koettigite (Köttigite) occurred on the 340 level at Sterling Hill, on both fresh and altered fracture surfaces in black-willemite ore which has a high calcite content. Associated minerals include pharmacosiderite, legrandite, ogdensburgite, yukonite, sphalerite, barium-pharmacosiderite [also known as bariopharmacosiderite], adamite, scorodite, and others. Koettigite has not been reported from Franklin. (Dunn, 1995)

 Location Found: Ogdensburg
     
 
 Year Discovered: 1849
     
 Formula: Zn3(AsO4)2 · 8H2O
 Essential Elements: Arsenic, Hydrogen, Oxygen, Zinc
 All Elements in Formula: Arsenic, Hydrogen, Oxygen, Zinc
     
 IMA Status: Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
     
     
 To find out more about this mineral at minDat's website, follow this link   Köttigite

     
 References:
Dunn, Pete J. (1995). Franklin and Sterling Hill New Jersey: the world's most magnificent mineral deposits. Franklin, NJ.: The Franklin-Ogdensburg Mineralogical Society. p.670. 'Koettigite'
The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 14, No. 1 - February 1973, pg. 8Mineral Notes - Kottigite (small article)
     
Images
     
Kottigite crystal sprays on willemite, calcite and franklinite ore from Sterling Hill Mine, NJKottigite crystal sprays on willemite, calcite and franklinite ore from Sterling Hill Mine, NJ under shortwave UV Light
Kottigite crystal sprays (blue-gray) on willemite, calcite and franklinite ore from Sterling Hill Mine, NJ. From the collection of, and photo by JVF.
Kottigite crystal sprays on willemite, calcite and franklinite ore from Sterling Hill Mine, NJ under shortwave UV light. The willemite fluoresces green, the kottigite, calcite and franklinite are non-fluorescent. From the collection of, and photo by JVF.

Kottigite crystal sprays on calcite and franklinite from Sterling Hill Mine, NJ

Kottigite crystal sprays (blue) on calcite and franklinite from Sterling Hill Mine, NJ. From the collection of, and photo by Robert A. Boymistruk.






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