Goyazite Mineral Data

Goyazite Mineral Data +

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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.

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 ScalenohedralH-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),

Forms:

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Forms: [ 0 2 1] [ 0 1 1] [ 0 0 1]

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Crystal Structure:

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Kato T , Mineralogical Journal , 13 (1987) p.390-396, Further refinement of the goyazite structure, Locality: Palermo mine, North Groton, New Hampshire, USA

Physical Properties of Goyazite

Cleavage:

[0001] Perfect

Color:

Lemon yellow, Pink, Colorless.

Density:

3.16 - 3.28, Average = 3.22

Diaphaniety:

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:

None.

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

Optical Data:

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

Calculated Properties of Goyazite

Electron Density:

r_electron=3.15 gm/cc
note: r_Goyazite=3.22 gm/cc.

Fermion Index

Fermion Index = 0.01352
Boson Index = 0.98648

Photoelectric:

PE_Goyazite= 21.69 barns/electron
U=PE_Goyazite x r_electron= 68.39 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Goyazite is Not Radioactive

Goyazite Classification

Dana Class:

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

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.3)Dana Group

42.7.3.1 Crandallite CaAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

42.7.3.2 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 Cm m

42.7.3.3 Goyazite SrAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

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

42.7.3.5 Plumbogummite PbAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

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

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

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

Strunz Class:

VII/B.36-30 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.36 - Crandallite group

VII/B.36-10 Crandallite CaAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

VII/B.36-20 Arsenocrandallite (Ca,Sr)Al3[(As,P)O4]2(OH)5·(H2O) R 3m 3m

VII/B.36-30 Goyazite SrAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

VII/B.36-40 Arsenogoyazite (Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5·(H2O) R 3m 3 2/m

VII/B.36-50 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 Cm m

VII/B.36-60 Arsenogorceixite! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3m 3 2/m

VII/B.36-70 Plumbogummite PbAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

VII/B.36-80 Philipsbornite PbAl3(AsO4)2(OH)5·(H2O) R 3m-,R 3m Trig

VII/B.36-90 Waylandite BiAl3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-100 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3m 3 2/m

VII/B.36-110 Florencite-(Ce) CeAl3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-120 Arsenoflorencite-(Ce) (Ce,La)Al3(AsO4)2(OH)6 R 3m 3 2/m

VII/B.36-125 Arsenoflorencite-(La)* (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 R 3m 3m

VII/B.36-130 Florencite-(La) (La,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-135 Arsenoflorencite-(Nd)* (Nd,La,Ce,Ba)(Al,Fe)3(AsO4,PO4)2(OH)6 R 3m 3m

VII/B.36-140 Florencite-(Nd) (Nd,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-150 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-150* Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5·(H2O) R 3m 3m

VII/B.36-152 Graulichite-(Ce)! CeFe3(AsO4)2(OH)6 R 3m 3 2/m

VII/B.36-155 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m

VII/B.36-160 Dussertite BaFe3(AsO4)2(OH)5 R 3m 3m

VII/B.36-170 Zairite Bi(Fe,Al)3(PO4)2(OH)6 R 3m 3 2/m

Other Goyazite Information

References:

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

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Goyazite

SrAl3(PO4)2(OH)5·(H2O)
Dana No: 42.7.3.3 Strunz No: VII/B.36-30
Locality:

Notes: