Hidalgoite Mineral Data

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

Environment:

Secondary mineral of the oxide zone of polymetallic sulfide deposits.

IMA Status:

Valid Species (Pre-IMA) 1953

Locality:

San Pascual mine, nine km northwest of Zimapan, Hidalgo, Mexico. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Hidalgoite + Pronunciation

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

Diaphaneity:

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
Ncalc = 1.71 - 1.77

Optical Data:

Uniaxial (?), b=1.713.

Calculated Properties of Hidalgoite

Electron Density:

Bulk Density (Electron Density)=3.65 gm/cc
note: Specific Gravity of Hidalgoite =3.96 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hidalgoite is Not Radioactive

Hidalgoite Classification

Dana Class:

43.04.01.03 (43)Compound Phosphates, etc.

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

(43.04.01)Beudantite Group

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

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

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

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

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

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

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

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

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

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

Strunz Class:

08.BL.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BL -With medium-sized and large cations, (OH, etc.):RO4 = 3:1

08.BL.05 Beudantite PbFe3(AsO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Corkite PbFe3(PO4)(SO4)(OH)6 R 3m 3m

08.BL.05 Hidalgoite PbAl3(AsO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Gallobeudantite! PbGa3[(AsO4),(SO4)]2(OH)6 R 3m 3m

08.BL.05 Hinsdalite (Pb,Sr)Al3(PO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Kemmlitzite (Sr,Ce)Al3(AsO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Orpheite PbAl3(PO4,SO4)2(OH)6(?) R 3m 3 2/m

08.BL.05 Woodhouseite CaAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

08.BL.05 Weilerite BaAl3H[(As,P)O4]2(OH)6 R 3m 3 2/m

08.BL.05 Svanbergite SrAl3(PO4)(SO4)(OH)6 R 3m 3 2/m

Other Hidalgoite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Hidalgoite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Hidalgoite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Hidalgoite :

A Bijoux Google Search for Hidalgoite
Adam's Minerals Google Search for Hidalgoite
Cape Minerals Google Search for Hidalgoite
Dakota Matrix Minerals Google Search for Hidalgoite
Excalibur Mineral Corp. Google Search for Hidalgoite
Exceptional Minerals Google Search for Hidalgoite
John Betts Fine Minerals Search for Hidalgoite
McDougall Minerals Google Search for Hidalgoite
Mineral News Website Link
Rock and Mineral Shows Google Search for Hidalgoite
Weinrich Minerals, Inc. Google Search for Hidalgoite

Ask about Hidalgoite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Hidalgoite Specimen Label here :

Hidalgoite

PbAl3(AsO4)(SO4)(OH)6
Dana No: 43.04.01.03 Strunz No: 08.BL.05
Locality:

Notes: