Benauite Mineral Data

Benauite Mineral Data +

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General Benauite Information

Chemical Formula:

HSrFe+++3(PO4)2(OH)6

Composition:

Molecular Weight = 603.13 gm

Barium 4.55 % Ba 5.08 % BaO

Strontium 10.17 % Sr 12.03 % SrO

Iron 26.85 % Fe 38.39 % Fe₂O₃

Phosphorus 7.70 % P 17.65 % P₂O₅

Hydrogen 1.39 % H 12.40 % H₂O

Lead 3.44 % Pb 3.70 % PbO

Sulfur 2.66 % S 6.64 % SO₃

Oxygen 43.24 % O

______ ______

100.00 % 95.89 % = TOTAL OXIDE

Empirical Formula:

Sr_0.7Ba_0.2Pb_0.1Fe³⁺_2.9(PO₄)_1.5(SO₄)_0.5(OH)_8.3

Environment:

Occurs as a secondary mineral in the oxidized zone of a hydrothermal polymetallic barite-fluorite deposit.

IMA Status:

Approved IMA 1995 (Dana # Added)

Locality:

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

Name Origin:

For the Benauer Berg, Germany, near which the Clara mine is situated.

Synonym:

IMA1995-001

Lusungite

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Benauite Crystallography

Axial Ratios:

a:c = 1:2.31456

Cell Dimensions:

a = 7.28, c = 16.85, Z = 3; V = 773.38 Den(Calc)= 3.88

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): 5.88(1)(101), 3.06(0.9)(113), 2.25(0.6)(107),3.65(0.6), 1.82(0.5)(118,220,216), 1.969(0.5)(303), 2.53(0.5)(204), 2.81(0.5)(006), 2.96(0.5)(105,202),

Physical Properties of Benauite

Cleavage:

[001] Perfect

Color:

Yellow, Brown.

Density:

3.65

Diaphaniety:

Transparent to Translucent

Fracture:

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

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3.5 - Copper Penny

Luster:

Vitreous - Resinous

Streak:

pale yellow

Optical Properties of Benauite

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.053 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2235,KPDmeas= 0.2375,KC= 0.236

Optical Data:

Uniaxial (-), e=1.862, w=1.872, bire=0.0100.

Calculated Properties of Benauite

Electron Density:

r_electron=3.52 gm/cc
note: r_Benauite=3.65 gm/cc.

Fermion Index

Fermion Index = 0.02892
Boson Index = 0.97108

Photoelectric:

PE_Benauite= 93.53 barns/electron
U=PE_Benauite x r_electron= 328.98 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Benauite is Not Radioactive

Benauite Classification

Dana Class:

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

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.3)Dana Group

42.7.3.1 Crandallite CaAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

42.7.3.2 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 Cm m

42.7.3.3 Goyazite SrAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

42.7.3.4 Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5·(H2O) R 3m 3m

42.7.3.5 Plumbogummite PbAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

42.7.3.6 Kintoreite PbFe3(PO4)2(OH,H2O)6 R 3m 3 2/m

42.7.3.7 Benauite ! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

42.7.3.8 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m

Strunz Class:

VII/B.36-150 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 Benauite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Eur. J. Min.,Vol.8,1996) OPTIC PROP.(Eur. J. Min.,Vol.8,1996)

See Also:

Links to other databases for Benauite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Benauite

HSrFe+++3(PO4)2(OH)6
Dana No: 42.7.3.7 Strunz No: VII/B.36-150
Locality:

Notes: