Hidalgoite Mineral Data

Hidalgoite Mineral Data +

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General Hidalgoite Information

Chemical Formula:

PbAl3(AsO4)(SO4)(OH)6

Composition:

Molecular Weight = 625.17 gm

Aluminum 12.95 % Al 24.46 % Al₂O₃

Arsenic 11.98 % As 18.38 % As₂O₅

Hydrogen 0.97 % H 8.64 % H₂O

Lead 33.14 % Pb 35.70 % PbO

Sulfur 5.13 % S 12.81 % SO₃

Oxygen 35.83 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbAl₃(AsO₄)(SO₄)(OH)₆

IMA Status:

Valid Species (Pre-IMA) 1953

Locality:

Link to MinDat.org Location Data.

Hidalgoite Image

Images:

Hidalgoite

Comments: White to light gray crystalline druze of hidalgoite.
Location: Sauberg Mine, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Hidalgoite Crystallography

Axial Ratios:

a:c = 1:2.41335

Cell Dimensions:

a = 7.04, c = 16.99, Z = 3; V = 729.24 Den(Calc)= 4.27

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.981(1), 3.51(0.9), 5.73(0.9),

Physical Properties of Hidalgoite

Cleavage:

None

Color:

Gray white, White, Light green, Light gray.

Density:

3.96

Diaphaniety:

Translucent to Subopaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Hidalgoite

Gladstone-Dale:

CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.072 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.167,KPDmeas= 0.1801,KC= 0.18

Optical Data:

Uniaxial (?), b=1.713.

Calculated Properties of Hidalgoite

Electron Density:

r_electron=3.65 gm/cc
note: r_Hidalgoite=3.96 gm/cc.

Fermion Index

Fermion Index = 0.0738
Boson Index = 0.9262

Photoelectric:

PE_Hidalgoite= 561.40 barns/electron
U=PE_Hidalgoite x r_electron=2,048.30 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hidalgoite is Not Radioactive

Hidalgoite Classification

Dana Class:

43.4.1.3 (43)Compound Phosphates, etc.

(43.4)(Anhydrous Compound Anions With Hydroxyl or Halogen)

(43.4.1)Dana Group

43.4.1.1 Beudantite PbFe3(AsO4)(SO4)(OH)6 R 3m 3 2/m

43.4.1.2 Corkite PbFe3(PO4)(SO4)(OH)6 R 3m 3m

43.4.1.3 Hidalgoite PbAl3(AsO4)(SO4)(OH)6 R 3m 3 2/m

43.4.1.4 Orpheite PbAl3(PO4,SO4)2(OH)6(?) R 3m 3 2/m

43.4.1.5 Hinsdalite (Pb,Sr)Al3(PO4)(SO4)(OH)6 R 3m 3 2/m

43.4.1.6 Svanbergite SrAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

43.4.1.7 Kemmlitzite (Sr,Ce)Al3(AsO4)(SO4)(OH)6 R 3m 3 2/m

43.4.1.8 Woodhouseite CaAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

43.4.1.9 Weilerite BaAl3H[(As,P)O4]2(OH)6 R 3m 3 2/m

43.4.1.10 Gallobeudantite! PbGa3[(AsO4),(SO4)]2(OH)6 R 3m 3m

Strunz Class:

VII/B.35-70 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.35 - Beudantite group

VII/B.35-10 Schlossmacherite (H3O,Ca)Al3(AsO4,SO4)2(OH)6 R 3m 3 2/m

VII/B.35-20 Woodhouseite CaAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

VII/B.35-30 Svanbergite SrAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

VII/B.35-40 Kemmlitzite (Sr,Ce)Al3(AsO4)(SO4)(OH)6 R 3m 3 2/m

VII/B.35-60 Hinsdalite (Pb,Sr)Al3(PO4)(SO4)(OH)6 R 3m 3 2/m

VII/B.35-65 Orpheite PbAl3(PO4,SO4)2(OH)6(?) R 3m 3 2/m

VII/B.35-70 Hidalgoite PbAl3(AsO4)(SO4)(OH)6 R 3m 3 2/m

VII/B.35-75 Gallobeudantite! PbGa3[(AsO4),(SO4)]2(OH)6 R 3m 3m

VII/B.35-80 Corkite PbFe3(PO4)(SO4)(OH)6 R 3m 3m

VII/B.35-90 Beudantite PbFe3(AsO4)(SO4)(OH)6 R 3m 3 2/m

Other Hidalgoite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Hidalgoite

PbAl3(AsO4)(SO4)(OH)6
Dana No: 43.4.1.3 Strunz No: VII/B.35-70
Locality:

Notes: