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Goyazite

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Formula:
SrAl3(PO4)2(OH)5 · H2O
System:
Trigonal
Colour:
White, Yellow, ...
Lustre:
Resinous, Greasy, Pearly
Hardness:
4½ - 5
Name:
Named in 1884 by Augustin Alexis Damour for the province of Goyaz (now Goiás), Brazil. (Note: Although the mineral's type locality is in the province of Minas Gerais, the mineral is named after the neighboring province.)
Isostructural with:
The strontium analogue of crandallite and plumbogummite, and the phosphate analogue of arsenogoyazite.

Classification of Goyazite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
8.BL.10

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
L : With medium-sized and large cations, (OH, etc.):RO4 = 3:1
42.7.3.3

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
19.5.3

19 : Phosphates
5 : Phosphates of Sr and Ba
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First Recorded Occurrence of Goyazite

Year of Discovery:
1884
Geological Setting of First Recorded Material:
Placer nodules

Occurrences of Goyazite

Geological Setting:
Granitic pegmatites; hydrothermal argillic alteration zones; in kaolinitic claystones derived from air-fall volcanic tuffs; sedimentary phosphate deposits, carbonatites; detrital deposits, including diamantiferous sands.

Physical Properties of Goyazite

Resinous, Greasy, Pearly
Diaphaneity (Transparency):
Transparent, Translucent
Comment:
Pearly on {0001} cleavage.
Colour:
White, Yellow, honey-yellow, pink, lilac, orange or colourless; colourless in transmitted light.
Hardness (Mohs):
4½ - 5
Tenacity:
Very brittle
Cleavage:
Perfect
On {0001}, perfect.
Density:
3.26 g/cm3 (Measured)    3.29 g/cm3 (Calculated)

Crystallography of Goyazite

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3m
Space Group Setting:
R3m
Cell Parameters:
a = 7.015Å, c = 16.558Å
Ratio:
a:c = 1 : 2.36
Unit Cell Volume:
V 705.66 ų (Calculated from Unit Cell)
Z:
3
Morphology:
Crystals rhombohedral, up to 2 cm, pseudocubic or flattened on {0001}, with {1012} striated (?) [0001], {2021}, {0111}, small {0001}, rarely paper thin plates with large {0001}; may be composite; massive, in detrital pebbles (favas) and grains.
X-Ray Powder Diffraction Data:
d-spacingIntensity
5.704 (65)
3.511 (40)
2.991 (13)
2.965 (100)
2.765 (20)
2.209 (45)
1.903 (20)
Comments:
ICDD 34-152

Optical Data of Goyazite

Type:
Uniaxial (+)
RI values:
nω = 1.620 - 1.635 nε = 1.630 - 1.651
2V:
Measured: 30°
Birefringence:
0.013
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Weak
Comments:
Thick grains (Ukraine):
O = Light pink
E = Pale Yellow, Pale green
Comments:
May be anomously biaxial, sectored.

Chemical Properties of Goyazite

Formula:
SrAl3(PO4)2(OH)5 · H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Ba,F

Relationship of Goyazite to other Species

Series:
Forms a series with Crandallite (see here)
Forms a series with Gorceixite (see here)
Other Members of Group:
BenauiteSrFe33+(HPO4,PO4)2(OH)6
CrandalliteCaAl3(PO4)2(OH)5 · H2O
EylettersiteTh0.75Al3(PO4)2(OH)6
Florencite-(Ce)CeAl3(PO4)2(OH)6
Florencite-(La)LaAl3(PO4)2(OH)6
Florencite-(Nd)(Nd,La,Ce)Al3(PO4)2(OH)6
Florencite-(Sm)(Sm,Nd)Al3(PO4)2(OH)6
GalloplumbogummitePb(Ga,Al)3-xGexH1-x(PO4)2(OH)6 for 0 ≤ x ≤ 1
GorceixiteBaAl3(PO4)2(OH)5 · H2O
KintoreitePbFe3(PO4)(PO3OH)(OH)6
Kintoreite-2cPbFe33+(PO4)2(OH,H2O)6
PlumbogummitePbAl3(PO4)2(OH)5 · H2O
SpringcreekiteBaV33+(PO4)2(OH,H2O)6
WaylanditeBiAl3(PO4)2(OH)6
ZaïriteBiFe33+(PO4)2(OH)6
8.BL.05BeudantitePbFe3(AsO4)(SO4)(OH)6
8.BL.05CorkitePbFe3(PO4)(SO4)(OH)6
8.BL.05HidalgoitePbAl3(AsO4)(SO4)(OH)6
8.BL.05HinsdalitePbAl3(PO4)(SO4)(OH)6
8.BL.05KemmlitziteSrAl3(AsO4)(SO4)(OH)6
8.BL.05SvanbergiteSrAl3(PO4)(SO4)(OH)6
8.BL.05WoodhouseiteCaAl3(PO4)(SO4)(OH)6
8.BL.05GallobeudantitePbGa3(AsO4)(SO4)(OH)6
8.BL.10ArsenogoyaziteSrAl3(AsO4)2(OH)5 · H2O
8.BL.10ArsenogorceixiteBaAl3(AsO4)2(OH)5 · H2O
8.BL.10ArsenocrandalliteCaAl3(AsO4)2(OH)5 · H2O
8.BL.10BenauiteSrFe33+(HPO4,PO4)2(OH)6
8.BL.10CrandalliteCaAl3(PO4)2(OH)5 · H2O
8.BL.10DussertiteBaFe33+(AsO4)2(OH)5
8.BL.10EylettersiteTh0.75Al3(PO4)2(OH)6
8.BL.10GorceixiteBaAl3(PO4)2(OH)5 · H2O
8.BL.10KintoreitePbFe3(PO4)(PO3OH)(OH)6
8.BL.10PhilipsbornitePbAl3(AsO4)2(OH)5 · H2O
8.BL.10PlumbogummitePbAl3(PO4)2(OH)5 · H2O
8.BL.10SegnititePbFe33+(AsO4)2(OH,H2O)6
8.BL.10SpringcreekiteBaV33+(PO4)2(OH,H2O)6
8.BL.13Arsenoflorencite-(La)LaAl3(AsO4)2(OH)6
8.BL.13Arsenoflorencite-(Nd)NdAl3(AsO4)2(OH)6
8.BL.13Arsenoflorencite-(Ce)CeAl3(AsO4)2(OH)6
8.BL.13Florencite-(Ce)CeAl3(PO4)2(OH)6
8.BL.13Florencite-(La)LaAl3(PO4)2(OH)6
8.BL.13Florencite-(Nd)(Nd,La,Ce)Al3(PO4)2(OH)6
8.BL.13WaylanditeBiAl3(PO4)2(OH)6
8.BL.13ZaïriteBiFe33+(PO4)2(OH)6
8.BL.13ArsenowaylanditeBiAl3(AsO4)2(OH)6
8.BL.13Graulichite-(Ce)CeFe33+(AsO4)2(OH)6
8.BL.13Florencite-(Sm)(Sm,Nd)Al3(PO4)2(OH)6
8.BL.15ViitaniemiiteNa(Ca,Mn2+)Al(PO4)(F,OH)3
8.BL.25PattersonitePbFe33+(PO4)2(OH)5 · H2O
19.5.1StrontiowhitlockiteSr9Mg(PO4)6(HPO4)
19.5.2Belovite-(Ce)NaCeSr3(PO4)3F
19.5.4GoedkeniteSr2Al(PO4)2(OH)
19.5.5Palermoite(Li,Na)2(Sr,Ca)Al4(PO4)4(OH)4
19.5.6NabaphiteNaBaPO4 · 9H2O
19.5.7Olgite(Sr,Ba)(Na,Sr,REE)2Na(PO4)2
19.5.8NastrophiteNa(Sr,Ba)PO4 · 9H2O
19.5.9JagoweriteBaAl2(PO4)2(OH)2
19.5.10GorceixiteBaAl3(PO4)2(OH)5 · H2O
19.5.11PenikisiteBa(Mg,Fe2+,Ca)2Al2(PO4)3(OH)3
19.5.12CuretoniteBa(Al,Ti)(PO4)(OH,O)F
19.5.13Bjarebyite(Ba,Sr)(Mn2+,Fe2+,Mg)2Al2(PO4)3(OH)3
19.5.14KulaniteBa(Fe2+,Mn2+,Mg)2(Al,Fe3+)2(PO4)3(OH)3
19.5.15PerloffiteBa(Mn2+,Fe2+)2Fe23+(PO4)3(OH)3

Other Names for Goyazite

Other Information

Other Information:
Slowly soluble in acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Goyazite

Reference List:
Damour, A. (1884): Note sur un nouveau phosphate d'alumine et de chaux, des terrains diamantifères. Bulletin de la Société française de Minéralogie 7, 204-205. [http://rruff.info/uploads/Bulletin_de_la_Societe_francaise_7_1884_204.pdf]

Hidden and Penfield (1890) American Journal of Science: 39: 511 (as Hamlinite).

Penfield (1897) American Journal of Science: 4: 313.

Solly (1905) Mineralogical Magazine: 14: 72 (as Bowmanite).

Bowman (1907) Mineralogical Magazine: 14: 389 (Hamlinite discreditation).

Ježek (1908) Bull. Ac. Sc. Bohême: 13.

Schaller (1911) American Journal of Science: 32: 359 (Hamlinite discreditation).

Gramont (1917) Bulletin de la Société française de Minéralogie: 40: 26.

Schaller (1917) American Journal of Science: 43: 165.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 82.

Weber (1928) Jb. Min., Beil.-Bd.: 57A: 563.

Bader (1934) Schweizerische mineralogische und petrographische Mitteilungen, Frauenfeld: 14: 319.

Gossner (1937) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 96: 488.

Pitkoskaya (1939) Academy of Sciences of the USSR: 25: 502.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 834.

White, J.S. (1981) Barian goyazite from Brazil. Mineralogical Record: 12: 379.

Kato, T. (1987) Further refinement of the goyazite structure. Mineralogical Journal (Japan): 13: 390-396.

Internet Links for Goyazite

Specimens:
The following Goyazite specimens are currently listed for sale on minfind.com.

Localities for Goyazite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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