Haigerachite Mineral Data

Haigerachite Mineral Data

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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

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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 - PrismaticH-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),

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Physical Properties of Haigerachite

Cleavage:

[001] Good

Color:

White.

Density:

2.44

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Haigerachite

Electron Density:

r_electron=2.44 gm/cc
note: r_Haigerachite=2.44 gm/cc.

Fermion Index

Fermion Index = 0.00364
Boson Index = 0.99636

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)

Estimated Radioactivity from Haigerachite - barely detectable

Haigerachite Classification

Dana Class:

39.3.10.1 (39)Hydrated Acid Phosphates, etc

(39.3)with miscellaneous formulae

(39.3.10)Dana Group

39.3.10.1 Haigerachite ! KFe3(H2PO4)6(HPO4)2·4(H2O) C 2/c 2/m

Strunz Class:

VII/C.21-30 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.21 - Francoanellite - Taranakite series

VII/C.21-10 Francoanellite H6(K,Na)3(Al,Fe)5(PO4)8·13(H2O) R 3c or R 3c Trig

VII/C.21-20 Taranakite K3Al5(HPO4)6(PO4)2·18(H2O) R 3c 3 2/m

VII/C.21-30 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 -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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Print or Cut-and-Paste your Haigerachite Specimen Label here :

Haigerachite

KFe+++3(H2PO4)6(HPO4)2·4(H2O)
Dana No: 39.3.10.1 Strunz No: VII/C.21-30
Locality:

Notes: