Goyazite Mineral Data

General Goyazite Information

Chemical Formula:

SrAl3(PO4)2(OH)5•(H2O)

Composition:

Molecular Weight = 461.56 gm

Strontium 18.98 % Sr 22.45 % SrO

Aluminum 17.54 % Al 33.14 % Al₂O₃

Phosphorus 13.42 % P 30.75 % P₂O₅

Hydrogen 1.53 % H 13.66 % H₂O

Oxygen 48.53 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

SrAl₃(PO₄)₂(OH)₅•(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1884

Locality:

Serra de Congonhas, Diamantina, Minas Gerais, Brazil Link to MinDat.org Location Data.

Name Origin:

Named after the province of Goyaz, Brazil.

Name Pronunciation:

Goyazite

Synonym:

Bowmanite

Hamlinite

ICSD 68170

Lusungite

PDF 34-152

Goyazite Image

Images:

Goyazite

Comments: Flat, tabular crystals of goyazite on dolomite.
Location: Langenbach quarry, Binntal, Valais, Switzerland. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Goyazite Crystallography

Axial Ratios:

a:c = 1:2.36363

Cell Dimensions:

a = 7.0218, c = 16.597, Z = 3; V = 708.69 Den(Calc)= 3.24

Crystal System:

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

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

By Intensity(I/I_o): 2.965(1), 5.704(0.65), 2.209(0.45),

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Forms: ( 0 2 1) ( 0 1 1) ( 0 0 1)

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Physical Properties of Goyazite

Cleavage:

{0001} Perfect

Color:

Lemon yellow, Pink, Colorless.

Density:

3.16 - 3.28, Average = 3.22

Diaphaneity:

Transparent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Blocky - Rhombohedral - Crystal shape resembles rhomohedrons.

Habit:

Disseminated - Occurs in small, distinct particles dispersed in matrix.

Hardness:

4-5 - Fluorite-Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Goyazite

Dichroism (e):

none.

Dichroism (w):

none.

Gladstone-Dale:

CI meas= 0.048 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.054 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1929,KPDmeas= 0.1941,KC= 0.2039
Ncalc = 1.64 - 1.67

Optical Data:

Uniaxial (+), w=1.62, e=1.63, bire=0.0100.

Calculated Properties of Goyazite

Electron Density:

Bulk Density (Electron Density)=3.15 gm/cc
note: Specific Gravity of Goyazite =3.22 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Goyazite= 21.69 barns/electron
U=PE_Goyazite x rElectron Density= 68.39 barns/cc.

Radioactivity:

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

Goyazite Classification

Dana Class:

42.07.03.03 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.07)where (AB)5 (XO4)3 Zq ï¿½ x(H2O)

(42.07.03)Crandallite Group

42.07.03.01 Crandallite CaAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

42.07.03.02 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 R 3m 3 2/m

42.07.03.03 Goyazite SrAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

42.07.03.04 Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5•(H2O) R 3m 3m

42.07.03.05 Plumbogummite PbAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

42.07.03.06 Kintoreite PbFe3(PO4)2(OH,H2O)6 R 3m 3 2/m

42.07.03.07 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

42.07.03.08 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m

Strunz Class:

08.BL.10 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.10 Arsenogorceixite! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3m 3 2/m

08.BL.10 Arsenocrandallite (Ca,Sr)Al3[(As,P)O4]2(OH)5•(H2O) R 3m 3m

08.BL.10 Ferrazite? (Pb,Ba)3(PO4)2•8(H2O)(?) Tri

08.BL.10 Arsenowaylandite* BiAl3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.10 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

08.BL.10 Arsenogoyazite (Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5•(H2O) R 3m 3 2/m

08.BL.10 Dussertite BaFe3(AsO4)2(OH)5 R 3m 3m

08.BL.10 Crandallite CaAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Goyazite SrAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 R 3m 3 2/m

08.BL.10 Kintoreite PbFe3(PO4)2(OH,H2O)6 R 3m 3 2/m

08.BL.10 Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5•(H2O) R 3m 3m

08.BL.10 Philipsbornite PbAl3(AsO4)2(OH)5•(H2O) R 3m-,R 3m Trig

08.BL.10 Plumbogummite PbAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Segnitite PbFe3H(AsO4)2(OH)6 R 3m 3 2/m

08.BL.10 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m

Other Goyazite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Goyazite :
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

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Goyazite

SrAl3(PO4)2(OH)5•(H2O)
Dana No: 42.07.03.03 Strunz No: 08.BL.10
Locality:

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