Arsenocrandallite Mineral Data

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."

Name Pronunciation:

Arsenocrandallite + Pronunciation

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 Pyramidal H-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

Diaphaneity:

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
Ncalc = 1.68 - 1.83

Optical Data:

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

Calculated Properties of Arsenocrandallite

Electron Density:

Bulk Density (Electron Density)=3.15 gm/cc
note: Specific Gravity of Arsenocrandallite =3.25 gm/cc.

Fermion Index:

Fermion Index = 0.0081080124
Boson Index = 0.9918919876

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Arsenocrandallite is Not Radioactive

Arsenocrandallite Classification

Dana Class:

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

(42.07)where (AB)5 (XO4)3 Zq ï¿½ x(H2O)

(42.07.04)Arsenocrandallite Group

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

42.07.04.02 Philipsbornite PbAl3(AsO4)2(OH)5•(H2O) R 3m-,R 3m Trig

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

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

Strunz Class:

08.BL.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BL -With medium-sized and large cations, (OH, etc.):RO4 = 3:1

08.BL.10 Arsenogorceixite! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3m 3 2/m

08.BL.10 Arsenocrandallite (Ca,Sr)Al3[(As,P)O4]2(OH)5•(H2O) R 3m 3m

08.BL.10 Ferrazite? (Pb,Ba)3(PO4)2•8(H2O)(?) Tri

08.BL.10 Arsenowaylandite* BiAl3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.10 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

08.BL.10 Arsenogoyazite (Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5•(H2O) R 3m 3 2/m

08.BL.10 Dussertite BaFe3(AsO4)2(OH)5 R 3m 3m

08.BL.10 Crandallite CaAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Goyazite SrAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 R 3m 3 2/m

08.BL.10 Kintoreite PbFe3(PO4)2(OH,H2O)6 R 3m 3 2/m

08.BL.10 Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5•(H2O) R 3m 3m

08.BL.10 Philipsbornite PbAl3(AsO4)2(OH)5•(H2O) R 3m-,R 3m Trig

08.BL.10 Plumbogummite PbAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Segnitite PbFe3H(AsO4)2(OH)6 R 3m 3 2/m

08.BL.10 Springcreekite! BaV3(PO4)2(OH,H2O)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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Arsenocrandallite

(Ca,Sr)Al3[(As,P)O4]2(OH)5•(H2O)
Dana No: 42.07.04.01 Strunz No: 08.BL.10
Locality:

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