Arsenogoyazite Mineral Data

Arsenogoyazite Mineral Data +

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General Arsenogoyazite Information

Chemical Formula:

(Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5·(H2O)

Composition:

Molecular Weight = 511.39 gm

Barium 2.69 % Ba 3.00 % BaO

Strontium 10.28 % Sr 12.16 % SrO

Calcium 2.35 % Ca 3.29 % CaO

Aluminum 15.83 % Al 29.91 % Al₂O₃

Arsenic 19.05 % As 29.21 % As₂O₅

Phosphorus 4.24 % P 9.71 % P₂O₅

Hydrogen 1.18 % H 10.57 % H₂O

Oxygen 40.67 % O

Fluorine 3.72 % F 3.72 % F

- % F -1.56 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Sr_0.6Ca_0.3Ba_0.1Al₃(AsO₄)_1.3(PO₄)_0.7(OH)₄F·(H₂O)

IMA Status:

Approved IMA 1984

Locality:

Clara mine, Oberwolfach, Black Forest, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the chemical composition and it's relationship to goyazite.

Synonym:

Weilerite

Arsenogoyazite Image

Images:

Click Here for Larger Arsenogoyazite Image

Arsenogoyazite Olivenite

Comments: White micro-botryoids of arsenogoyazite with light green acicular crystal sprays of olivenite and dark green malachite on brown limonite.
Location: Centennial Eureka Mine, Juab County, Utah. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Arsenogoyazite

Comments: Clear, white micro (<0.25mm) rhombohedral arsenogoyazite crystals.
Location: Clara mine, Schwarzwald, Germany. Scale: Picture size 0.5 cm.
© Tom Loomis / Dakota Matrix

Arsenogoyazite Crystallography

Axial Ratios:

a:c = 1:2.4169

Cell Dimensions:

a = 7.1, c = 17.16, Z = 3; V = 749.14 Den(Calc)= 3.40

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): 3.03(1), 3.56(0.8), 5.84(0.7),

Physical Properties of Arsenogoyazite

Cleavage:

None

Color:

Greenish white, Gray green, Yellow, Light green.

Density:

3.33 - 3.35, Average = 3.34

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Arsenogoyazite

Gladstone-Dale:

CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1882,KPDmeas= 0.1916,KC= 0.1931

Optical Data:

Uniaxial (?), a=1.64, b=1.64, bire=0.0000.

Calculated Properties of Arsenogoyazite

Electron Density:

r_electron=3.21 gm/cc
note: r_{Arsenogoyazite}=3.34 gm/cc.

Fermion Index

Fermion Index = 0.01221
Boson Index = 0.98779

Photoelectric:

PE_{Arsenogoyazite}= 36.36 barns/electron
U=PE_{Arsenogoyazite} x r_electron= 116.73 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Arsenogoyazite is Not Radioactive

Arsenogoyazite Classification

Dana Class:

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

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.4)Dana Group

42.7.4.1 Arsenocrandallite (Ca,Sr)Al3[(As,P)O4]2(OH)5·(H2O) R 3m 3m

42.7.4.2 Philipsbornite PbAl3(AsO4)2(OH)5·(H2O) R 3m-,R 3m Trig

42.7.4.3 Arsenogoyazite (Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5·(H2O) R 3m 3 2/m

42.7.4.4 Segnitite PbFe3H(AsO4)2(OH)6 R 3m 3 2/m

Strunz Class:

VII/B.36-40 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 Arsenogoyazite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Arsenogoyazite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Arsenogoyazite

(Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5·(H2O)
Dana No: 42.7.4.3 Strunz No: VII/B.36-40
Locality:

Notes: