Arsenocrandallite Mineral Data

Arsenocrandallite Mineral Data +

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General Arsenocrandallite Information

Chemical Formula:

(Ca,Sr)Al3[(As,P)O4]2(OH)5·(H2O)

Composition:

Molecular Weight = 595.75 gm

Strontium 11.03 % Sr 13.04 % SrO

Calcium 15.14 % Ca 21.18 % CaO

Aluminum 13.59 % Al 25.67 % Al₂O₃

Arsenic 18.86 % As 28.93 % As₂O₅

Phosphorus 2.60 % P 5.96 % P₂O₅

Hydrogen 1.18 % H 10.58 % H₂O

Oxygen 37.60 % O

______ ______

100.00 % 105.37 % = TOTAL OXIDE

Empirical Formula:

Ca_2.25Sr_0.75Al₃(AsO₄)_1.5(PO₄)_0.5(OH)₅·(H₂O)

Environment:

Occurs as a secondary mineral on specimens from a mine dump (Neubulach, Germany).

IMA Status:

Approved IMA 1981

Locality:

From Neubulach, and in the Clara mine, near Oberwolfach, Black Forest, Germany. At the Centennial Eureka mine, Tintic district, Juab Co., Utah, USA. Link to MinDat.org Location Data.

Name Origin:

For "arsenic" in the composition, and relation to "crandallite."

Arsenocrandallite Image

Images:

Arsenocrandallite

Comments: Micro, pale blue botryoids of arsenocrandallite on dark green olivenite and quartz.
Location: Centennial Eureka Mine, Juab County, Utah. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Arsenocrandallite Crystallography

Axial Ratios:

a:c = 1:2.43926

Cell Dimensions:

a = 7.08, c = 17.27, Z = 3; V = 749.70 Den(Calc)= 3.96

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

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

By Intensity(I/I_o): 2.99(1), 3.55(0.9), 1.769(0.6),

Physical Properties of Arsenocrandallite

Cleavage:

None

Color:

Blue, Blue green.

Density:

3.25

Diaphaniety:

Transparent

Fracture:

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

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Arsenocrandallite

Gladstone-Dale:

CI meas= 0.086 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.249 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1578,KPDmeas= 0.1923,KC= 0.2103

Optical Data:

Uniaxial (?), a=1.625, b=1.625, bire=0.0000.

Calculated Properties of Arsenocrandallite

Electron Density:

r_electron=3.15 gm/cc
note: r_{Arsenocrandallite}=3.25 gm/cc.

Fermion Index

Fermion Index = 0.0081
Boson Index = 0.9919

Photoelectric:

PE_{Arsenocrandallite}= 27.09 barns/electron
U=PE_{Arsenocrandallite} x r_electron= 85.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Arsenocrandallite is Not Radioactive

Arsenocrandallite Classification

Dana Class:

42.7.4.1 (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.36-20 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 Arsenocrandallite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Arsenocrandallite :
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 -École des Mines de Paris

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Arsenocrandallite

(Ca,Sr)Al3[(As,P)O4]2(OH)5·(H2O)
Dana No: 42.7.4.1 Strunz No: VII/B.36-20
Locality:

Notes: