Arsenogoyazite Mineral Data

Arsenogoyazite Mineral Data +

[Content and History] [Recent Issues] [Back Issues] [Subscriptions] [Contacts]
See Also: [Diamond Crystals] [Excalibur Minerals] [Hudson Institute] [Minerals on CDROM]
Mineral News was founded some twenty years ago and has developed a following of
avid mineral collectors seeking timely information about new finds and other items
of interest to the collector community. Articles are solicited from collector and scientific authors.

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

Search for Arsenogoyazite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Arsenogoyazite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Arsenogoyazite Mineral Data :

Ask about Arsenogoyazite 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 Arsenogoyazite Specimen Label here :

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: