hureaulite

{{Infobox mineral |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)&nbsp;Å b = 9.086(5)&nbsp;Å c = 9.404(5)&nbsp;Å β = 96.67(8)°; Z&nbsp;=&nbsp;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 | twinning = | 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<v, very strong | 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) | density = | melt = | fusibility = | diagnostic = | solubility = Easily soluble in acids. | diaphaneity = Transparent to translucent | other = | references = }} 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, .