PYROAURITE, VAR. PYROAURITE-2H (SJÖGRENITE)

Pyroaurite, var. pyroaurite-2H (sjögrenite) is not in the current Franklin Mineral Species List.
Sjögrenite, a magnesium ferric-iron carbonate hydroxide hydrate mineral and a polymorph of pyroaurite, was first noted from Sterling Hill by Dunn and Leavens (1981); it has not been found at Franklin. The crystals are bright orange, with vitreous luster, and occur as sharp-edged, stacked, platy crystals overgrown
epitactically on corroded pyroaurite.
Sjögrenite was verified using powder X-ray diffraction methods and chemical tests. It is best distinguished from pyroaurite using X-ray methods.
The above-described sjögrenite occurs on the 1300 level at Sterling Hill, on a matrix of calcite-willemite-franklinite ore, which is coated with secondary chlorophoenicite, sphalerite, barite, willemite, and pyroaurite. Sjögrenite is a rare mineral locally. (Dunn, 1995)

Location Found:

Ogdensburg

Mineral Note:

Originally named sjögrenite by Clifford Frondel, Removed from Franklin Mineral list in 2017

Formula:

Mg₆Fe₂³⁺(OH)₁₆[CO₃] · 4H₂O

Essential Elements:

Carbon, Hydrogen, Iron, Magnesium, Oxygen

All Elements in Formula:

Carbon, Hydrogen, Iron, Magnesium, Oxygen

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 Pyroaurite, var. pyroaurite-2H (sjögrenite)

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.625. 'Sjögrenite'

The Picking Table References

	PT Issue and Page	Description / Comment
View Issue	V. 23, No. 1 - Spring 1982, pg. 13	Mineral Notes Research Reports, Sjögrenite on Pyroaurite
View Issue	V. 19, No. 2 - September 1978, pg. 6	Recent Mineral Occurrences at Sterling Hill by Stephen Sanford - Pyroaurite (small article)
View Issue	V. 7, No. 2 - August 1966, pg. 12	The Minerals of Sterling Hill 1962-65 by Frank Z. Edwards - Pyroaurite (small article)
View Issue	V. 7, No. 1 - February 1966, pg. 8	Pyroaurite

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