Hentschelite Mineral Data

Hentschelite Mineral Data +

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General Hentschelite Information

Chemical Formula:

Cu++Fe+++2(PO4)2(OH)2

Composition:

Molecular Weight = 399.20 gm

Iron 27.98 % Fe 40.00 % Fe₂O₃

Copper 15.92 % Cu 19.93 % CuO

Phosphorus 15.52 % P 35.56 % P₂O₅

Hydrogen 0.50 % H 4.51 % H₂O

Oxygen 40.08 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CuFe³⁺₂(PO₄)₂(OH)₂

IMA Status:

Approved IMA 1987

Locality:

Link to MinDat.org Location Data.

Synonym:

Andrewsite

ICSD 62242

PDF 40-501

Hentschelite Image

Images:

Hentschelite

Comments: Dark green botryoidal hentschelite in transparent quartz.
Location: Spring Creek Mine, near Wilmington, South Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hentschelite Crystallography

Axial Ratios:

a:b:c =0.8969:1:0.9332

Cell Dimensions:

a = 6.984, b = 7.786, c = 7.266, Z = 2; beta = 117.68° V = 349.89 Den(Calc)= 3.79

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 3.33(1), 3.27(0.5), 4.81(0.5),

Physical Properties of Hentschelite

Cleavage:

None

Color:

Dark green.

Density:

3.79

Diaphaniety:

Translucent

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

light green

Optical Properties of Hentschelite

Gladstone-Dale:

CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2318,KPDmeas= 0.2318,KC= 0.2403

Optical Data:

Biaxial (+), a=1.843, b=1.848, g=1.945, bire=0.1020, 2V(Calc)=28, 2V(Meas)=60-70.

Calculated Properties of Hentschelite

Electron Density:

r_electron=3.66 gm/cc
note: r_Hentschelite=3.79 gm/cc.

Fermion Index

Fermion Index = 0.00612
Boson Index = 0.99388

Photoelectric:

PE_Hentschelite= 16.12 barns/electron
U=PE_Hentschelite x r_electron= 59.08 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hentschelite is Not Radioactive

Hentschelite Classification

Dana Class:

41.10.1.3 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.10)where (A++ B++)3 (XO4)2 Zq

(41.10.1)Dana Group

41.10.1.1 Lazulite MgAl2(PO4)2(OH)2 P 2₁/c 2/m

41.10.1.2 Scorzalite (Fe,Mg)Al2(PO4)2(OH)2 P 2/c 2/m

41.10.1.3 Hentschelite CuFe2(PO4)2(OH)2 P 2₁/n 2/m

41.10.1.4 Barbosalite FeFe2(PO4)2(OH)2 P 2₁/c 2/m

Strunz Class:

VII/B.08-50 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.08 - Lazulite group, Trolleite - Richellite

VII/B.08-10 Trolleite Al4(PO4)3(OH)3 I2/c 2/m

VII/B.08-20 Lazulite MgAl2(PO4)2(OH)2 P 2₁/c 2/m

VII/B.08-30 Scorzalite (Fe,Mg)Al2(PO4)2(OH)2 P 2/c 2/m

VII/B.08-40 Barbosalite FeFe2(PO4)2(OH)2 P 2₁/c 2/m

VII/B.08-50 Hentschelite CuFe2(PO4)2(OH)2 P 2₁/n 2/m

VII/B.08-55 Wilhelmkleinite! ZnFe3(AsO4)2(OH)2 P 2₁/n 2/m

VII/B.08-60 Lipscombite (Fe,Mn)Fe2(PO4)2(OH)2 P 4₁2₁2 4 2 2

VII/B.08-70 Richellite Ca3Fe10(PO4)8(OH)12·n(H2O) P 4 4

Other Hentschelite Information

References:

PHYS. PROP.(Am.Min.,Vol.72,p404-408,1987) OPTIC PROP.(Am.Min.,Vol.72,p404-408,1987)

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Hentschelite

Cu++Fe+++2(PO4)2(OH)2
Dana No: 41.10.1.3 Strunz No: VII/B.08-50
Locality:

Notes: