Parabrandtite



Parabrandtite is a calcium manganese arsenate hydrate mineral and the Mn analogue of talmessite.
Parabrandtite, first thought to be talmessite, was described from Sterling Hill by Dunn et al. (1987c). It has not been found at Franklin.
Parabrandtite occurs as stout, colorless, 1-2 mm aggregates of crystals which occur in parallel growth; the quality of available crystals did not permit goniometric measurement of the crystal forms.
Parabrandtite is transparent, has perfect cleavage, vitreous luster, and a density of 3.55 g/cm3 (meas.), 3.60 g/cm3 (calc.). The optical orientation is given in detail by Dunn et al. (1987c). There is no discernible fluorescence in ultraviolet. It is best verified using X-ray and chemical methods.
Parabrandtite occurs at Sterling Hill, forming crystals in a cavity in franklinite/red-willemite/calcite ore. It is associated with sarkinite and was found but once. (Dunn, 1995)


 Location Found: Ogdensburg (Type Locality)
     
 
 Year Discovered: 1986
     
 Formula: Ca2Mn2+(AsO4)2 · 2H2O
 Essential Elements: Arsenic, Calcium, Hydrogen, Manganese, Oxygen
 All Elements in Formula: Arsenic, Calcium, Hydrogen, Manganese, Oxygen
     
 IMA Status: Approved 1986
     
     
 To find out more about this mineral at minDat's website, follow this link   Parabrandtite

     
 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.675


The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 29 No. 1 - Spring 1988, pg. 14Mineral Notes New To Science, Parabrandtite
View IssueV. 28, No. 1 - Spring 1987, pg. 3From the Laboratory, Dr. Pete J. Dunn, John L. Baum, Parabrandtite
     
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