Haigerachite Mineral Data

General Haigerachite Information

Chemical Formula:

KFe+++3(H2PO4)6(HPO4)2•4(H2O)

Composition:

Molecular Weight = 1,052.58 gm

Potassium 3.71 % K 4.47 % K₂O

Iron 15.92 % Fe 22.76 % Fe₂O₃

Phosphorus 23.54 % P 53.94 % P₂O₅

Hydrogen 2.11 % H 18.83 % H₂O

Oxygen 54.72 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KFe³⁺₃H₁₄(PO₄)₈•4(H₂O)

Environment:

Secondary mineral formed in the dump material of the mine.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Silberbrunnle mine dump near Gengenbach in the central Black Forest, Aufschluss, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the village and valley near the locality.

Synonym:

IMA1997-049

Haigerachite Crystallography

Axial Ratios:

a:b:c =1.7674:1:1.8321

Cell Dimensions:

a = 16.95, b = 9.59, c = 17.57, Z = 4; beta = 90.85° V = 2,855.70 Den(Calc)= 2.45

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 8.83(1), 3.75(1), 3.02(0.9),3.25(0.5), 3.11(0.4), 3.3(0.4), 7.6(0.4),

Forms:

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Forms: ( 1 1 0) ( 1 0 0) ( 0 0 1)

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Physical Properties of Haigerachite

Cleavage:

{001} Good

Color:

White.

Density:

2.44

Diaphaneity:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Habit:

Scaly - Morphology like fish scales.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Haigerachite

Gladstone-Dale:

CI meas= 0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.239,KPDmeas= 0.24,KC= 0.2432
Ncalc = 1.59 - 1.6

Optical Data:

Biaxial (-), a=1.557, b=1.598, g=1.602, bire=0.0450

Calculated Properties of Haigerachite

Electron Density:

Bulk Density (Electron Density)=2.44 gm/cc
note: Specific Gravity of Haigerachite =2.44 gm/cc.

Fermion Index:

Fermion Index = 0.003644709
Boson Index = 0.996355291

Photoelectric:

PE_Haigerachite= 6.17 barns/electron
U=PE_Haigerachite x r_electron= 15.09 barns/cc.

Radioactivity:

GRapi = 53.64 (Gamma Ray American Petroleum Institute Units)
Concentration of Haigerachite per GRapi unit = 1.86 (%)

Estimated Radioactivity from Haigerachite - barely detectable

Haigerachite Classification

Dana Class:

39.03.10.01 (39)Hydrated Acid Phosphates, etc

(39.03)with miscellaneous formulae

(39.03.10)Dana Group

39.03.10.01 Haigerachite! KFe3(H2PO4)6(HPO4)2•4(H2O) C 2/c 2/m

Strunz Class:

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

08.C - Phosphates without Additional Anions, with H2O

08.CF -With large and medium-sized cations, RO4:H2O > 1:1

08.CF.10 Haigerachite! KFe3(H2PO4)6(HPO4)2•4(H2O) C 2/c 2/m

Other Haigerachite Information

References:

NAME( AmMin, V 85, p263) PHYS. PROP.(AmMin, V 85, p263) OPTIC PROP.(AmMin, V85, p263)

See Also:

Links to other databases for Haigerachite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Print or Cut-and-Paste your Haigerachite Specimen Label here :

Haigerachite

KFe+++3(H2PO4)6(HPO4)2•4(H2O)
Dana No: 39.03.10.01 Strunz No: 08.CF.10
Locality:

Notes:

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