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

Environment:

Secondary mineral in some oxidized copper deposits.

IMA Status:

Approved IMA 1987

Locality:

Reichenbach, near Bensheim, Hesse, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Gerhard Hentschel (1930- ), Geological Survey of Hesse, Wiesbaden, Germany.

Name Pronunciation:

Hentschelite + Pronunciation

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),

Crystal Structure:

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Sieber N H W , Tillmanns E , Hofmeister W , Acta Crystallographica, Section C , 43 (1987) p.1855-1857, Structure of hentschelite, CuFe2(PO4)2(OH)2, a new member of the lazulite group, Locality: silicified barite vein, Reichenbach, Odenwald, Germany

Physical Properties of Hentschelite

Cleavage:

None

Color:

Dark green.

Density:

3.79

Diaphaneity:

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
Ncalc = 1.91

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:

Bulk Density (Electron Density)=3.66 gm/cc
note: Specific Gravity of Hentschelite =3.79 gm/cc.

Fermion Index:

Fermion Index = 0.0061248201
Boson Index = 0.9938751799

Photoelectric:

PE_Hentschelite= 16.12 barns/electron
U=PE_Hentschelite x rElectron Density= 59.08 barns/cc.

Radioactivity:

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

Hentschelite Classification

Dana Class:

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

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

(41.10.01)Lazulite Group

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

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

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

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

Strunz Class:

08.BB.40 08 - PHOSPHATES, ARSENATES, VANADATES

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

08.BB -With only medium-sized cations, (OH, etc.):RO4 £ 1:1

08.BB.40 Barbosalite FeFe2(PO4)2(OH)2 P 2₁/c 2/m

08.BB.40 Wilhelmkleinite! ZnFe3(AsO4)2(OH)2 P 2₁/n 2/m

08.BB.40 Hentschelite CuFe2(PO4)2(OH)2 P 2₁/n 2/m

08.BB.40 Lazulite MgAl2(PO4)2(OH)2 P 2₁/c 2/m

08.BB.40 Scorzalite (Fe,Mg)Al2(PO4)2(OH)2 P 2/c 2/m

Other Hentschelite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.72,p404-408,1987) OPTIC PROP.(Am.Min.,Vol.72,p404-408,1987)

See Also:

Links to other databases for Hentschelite :
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
15 - WWW-MINCRYST

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Hentschelite

Cu++Fe+++2(PO4)2(OH)2
Dana No: 41.10.01.03 Strunz No: 08.BB.40
Locality:

Notes: