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Woodhouseite

Field	Value
name	Woodhouseite
category	Phosphate minerals
boxwidth	24
image	woodhouseite 01.jpg
caption	Woodhouseite from the type locality, the Champion Mine, Mono County, California, US. Specimen width is 2.8 cm
formula	CaAl3(SO4)(PO4)(OH)6
IMAsymbol	Wdh
molweight	414.10 g/mol
strunz	8.BL.05
dana	43.04.01.08
system	Trigonal
class	Hexagonal scalenohedral ( 2/m)
symmetry	Rm (no. 166)
color	White, flesh-pink or colorless
habit	Crystals small, pseudocubic rhombohedral {1012}; tabular at times {0001}, with curved and striated faces.
cleavage	Excellent on {0001}
mohs	4.5
luster	Vitreous, pearly on {0001}
refractive	(AM22) nω = 1.636
nε = 1.647
opticalprop	Uniaxial (+), 2V = 0° to 20°
birefringence	δ = 0.011
streak	White
gravity	(measured): 3.012 (calculated): 3.00
solubility	Soluble in acids only after driving off the water in a closed tube.
diaphaneity	Transparent to translucent
other	Not radioactive.
references

nε = 1.647 Woodhouseite belongs to the beudantite group AB3(XO4)(SO4)(OH)6 where A = Ba, Ca, Pb or Sr, B = Al or Fe and X = S, As or P. Minerals in this group are isostructural with each other and also with minerals in the crandallite and alunite groups. They crystallise in the rhombohedral system with space group Rm and crystals are usually either tabular {0001} or pseudo-cubic to pseudo-cuboctahedral. Woodhouseite was named after Professor Charles Douglas Woodhouse (1888–1975), an American mineralogist and mineral collector from the University of California, Santa Barbara, US, and one-time General Manager of Champion Sillimanite, Inc.

Environment

Woodhouseite is a secondary mineral found where wall rock alteration occurred in hydrothermal and disseminated ore deposits; rare in cave deposits, formed from guano. At the type locality it occurs in vugs in quartz veins in an andalusite, Al2OSiO4, deposit. This is in pre-Cambrian meta-quartzite that has been intruded by late Jurassic granitic rocks. Woodhouseite is found only near masses of lazulite, MgAl2(PO4)2(OH)2. Associated Minerals at the type locality include topaz, Al2SiO4F2, quartz, SiO2, augelite, Al2PO4(OH)3, lazulite, MgAl2(PO4)2(OH)2, tourmaline, baryte, BaSO4, muscovite, KAl2(Si3Al)O10(OH)2, and pyrophyllite, Al2Si4O10(OH)2, all of which formed before the woodhouseite, which is a late-forming mineral.

Localities

The type locality is the Champion Mine (White Mountain Mine), White Mountain, Laws, White Mountains, Mono County, California, US. This is a former sillimanite mine located near Laws; mineralisation is a metamorphic sillimanite deposit hosted in quartzite.

Structure

Space Group: R 2/m

Unit Cell Parameters: a = 6.993 Å, c = 16.386 Å, Z: 3

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
"Woodhouseite Mineral Data".
http://www.mindat.org/min-4311.html Mindat.org
http://rruff.geo.arizona.edu/doclib/hom/woodhuseite.pdf Handbook of Mineralogy
"University of California: In Memoriam, May 1977".
Lemmon, Dwight M (1937) American Mineralogist 22:939-948

Info: Wikipedia Source

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aluminium-minerals calcium-minerals phosphate-minerals trigonal-minerals minerals-in-space-group-166 beudantite-group

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