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Hureaulite

Manganese phosphate mineral

Field	Value
boxbgcolor	#d0a280	name = Hureaulite
category	Phosphate minerals
image	hureaulite 01.jpg
imagesize	260px
caption	Hureaulite from the Cigana Claim, Conselheiro Pena, Minas Gerais, Brazil. Specimen size 2.8 cm.
formula
IMAsymbol	Hur
molweight	728.65 g/mol
strunz	8.CB.10 (10 ed)
7/C.04-10 (8 ed)
dana	39.2.1.1
system	Monoclinic
class	Prismatic (2/m)
(same H-M symbol)
symmetry	C2/c
unit cell	a = 17.594(10) Å
b = 9.086(5) Å
c = 9.404(5) Å
β = 96.67(8)°; Z = 4
colour	Orange, red, yellow, brown, grey or nearly colourless
habit	Crystals are short prismatic parallel to (100) or equant, sometimes thick tabular, also massive or imperfectly fibrous
cleavage	{100} good
fracture	Uneven
tenacity	Brittle
mohs	3.5
lustre	Vitreous to greasy
refractive	nα = 1.640 – 1.654 nβ = 1.649 – 1.659 nγ = 1.655 – 1.662
opticalprop	Biaxial (−)
2V	greater than 60°
dispersion	r
birefringence	δ = 0.012
pleochroism	X colourless, Y yellow to pale rose, Z reddish yellow to reddish brown
streak	Nearly white
gravity	3.18–3.2 (measured), 3.23 (calculated)
solubility	Easily soluble in acids.
diaphaneity	Transparent to translucent
references

7/C.04-10 (8 ed) (same H-M symbol) b = 9.086(5) Å c = 9.404(5) Å β = 96.67(8)°; Z = 4 Hureaulite is a manganese phosphate with the formula . It was discovered in 1825 and named in 1826 for the type locality, Les Hureaux, Saint-Sylvestre, Haute-Vienne, Limousin, France. It is sometimes written as huréaulite, but the IMA does not recommend this for English language text.

A complete series exists from lithiophilite, to triphylite, , including hureaulite, strengite, , stewartite, , and sicklerite, .

Environment

Hureaulite is a secondary mineral occurring in granite pegmatites. Associated at the type locality with vivianite, ; rockbridgeite, ; heterosite, and cacoxenite, . It can be synthesised; most natural hureaulites are Mn-rich compounds but extensive () solution is known for synthetic material.

Localities

The type locality is Les Hureaux, Saint-Sylvestre, Haute-Vienne, Limousin, France. Hureaulite is also found in a granite pegmatite known for its phosphates in the Aimorés pegmatite district, at the Cigana claim in Galiléia, Doce valley, Minas Gerais, Brazil, formerly known as the Jocão Mine.

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
Murdoch, Joseph (1942) Contributions to the Crystallography of Hureaulite. American Mineralogist 27: 228
Gaines et al (1997) Dana's New Mineralogy Eighth Edition
http://www.mindat.org/min-1952.html Mindat.org
Shigley and Brown (1985) American Mineralogist 70:395
Roberts, Campbell and Rapp (1990) Encyclopedia of Minerals, 2nd edition
Burke, E. A. J. (2008): Tidying up Mineral Names: An IMA scheme for Suffixes, Hyphens and Diacritical Marks. Mineralogical Record, 39, 134
Murdoch, Joseph (1943) Crystallography of Hureaulite. American Mineralogist 28: 19-24
At the [[Type locality (geology). type locality]] it occurs in a zone of altered [[triphylite]], {{chem2
Gerault, Y, Riou, A, and Cudennec, Y (1987) Acta Crystallographica (C) 43:1829

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manganese(ii)-minerals phosphate-minerals monoclinic-minerals tetrahydrate-minerals minerals-in-space-group-15

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