Kingsmountite Mineral Data

Kingsmountite Mineral Data +

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General Kingsmountite Information

Chemical Formula:

(Ca,Mn++)4(Fe++,Mn++)Al4(PO4)6(OH)4·12(H2O)

Composition:

Molecular Weight = 1,204.33 gm

Calcium 10.65 % Ca 14.90 % CaO

Magnesium 0.20 % Mg 0.33 % MgO

Manganese 6.39 % Mn 8.25 % MnO

Aluminum 8.74 % Al 16.51 % Al₂O₃

Iron 3.71 % Fe 3.58 % FeO / 1.33 % Fe₂O₃

Phosphorus 15.43 % P 35.36 % P₂O₅

Hydrogen 2.28 % H 20.34 % H₂O

Oxygen 52.61 % O

______ ______

100.00 % 100.60 % = TOTAL OXIDE

Empirical Formula:

Ca_3.2Mn²⁺_0.9Fe²⁺_0.6Mn²⁺_0.5Mg_0.1Al_3.9Fe³⁺_0.2(PO₄)₆(OH)₄·11.6(H₂O)

Environment:

Secondary mineral from the oxidation of primary phosphates be descending oxidizing ground water in complex granite pegmatites.

IMA Status:

Approved IMA 1979

Locality:

Foote Quarry, Kings Mountain, Cleveland County, North Carolina, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Kingsmountite Image

Images:

Kingsmountite

Comments: White, radial spray of kingsmountite crystals.
Location: Kings Mountain, Cleveland County, North Carolina, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Kingsmountite Crystallography

Axial Ratios:

a:b:c =0.41:1:0.2558

Cell Dimensions:

a = 10.029, b = 24.46, c = 6.258, Z = 2; beta = 91.16° V = 1,534.83 Den(Calc)= 2.61

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: C 2

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

By Intensity(I/I_o): 5.15(1), 2.624(0.6), 12.28(0.5),

Physical Properties of Kingsmountite

Color:

Light brown, Pearl white.

Density:

2.51

Diaphaniety:

Transparent

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

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

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

2.5 - Finger Nail

Luster:

Pearly

Streak:

white

Optical Properties of Kingsmountite

Gladstone-Dale:

CI meas= -0.048 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2221,KPDmeas= 0.2309,KC= 0.2204

Optical Data:

Biaxial (-), a=1.575, b=1.581, g=1.583, bire=0.0080, 2V(Calc)=58, 2V(Meas)=62.

Calculated Properties of Kingsmountite

Electron Density:

r_electron=2.63 gm/cc
note: r_{Kingsmountite}=2.61 gm/cc.

Fermion Index

Fermion Index = 0.00138
Boson Index = 0.99862

Photoelectric:

PE_{Kingsmountite}= 4.99 barns/electron
U=PE_{Kingsmountite} x r_electron= 13.09 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kingsmountite is Not Radioactive

Kingsmountite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.8)Dana Group

42.11.8.1 Montgomeryite Ca4MgAl4(PO4)6(OH)4·12(H2O) C 2/c 2/m

42.11.8.2 Kingsmountite (Ca,Mn)4(Fe,Mn)Al4(PO4)6(OH)4·12(H2O) C 2 2

42.11.8.3 Calcioferrite Ca4Fe(Fe,Al)4(PO4)6(OH)4·12(H2O) C 2 2

42.11.8.4 Zodacite Ca4MnFe4(PO4)6(OH)4·12(H2O) C 2/c,Cc Mono

Strunz Class:

VII/D.31-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.31 - Montgomeryite group

VII/D.31-10 Montgomeryite Ca4MgAl4(PO4)6(OH)4·12(H2O) C 2/c 2/m

VII/D.31-20 Kingsmountite (Ca,Mn)4(Fe,Mn)Al4(PO4)6(OH)4·12(H2O) C 2 2

VII/D.31-30 Calcioferrite Ca4Fe(Fe,Al)4(PO4)6(OH)4·12(H2O) C 2 2

VII/D.31-40 Zodacite Ca4MnFe4(PO4)6(OH)4·12(H2O) C 2/c,Cc Mono

Other Kingsmountite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Kingsmountite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Kingsmountite

(Ca,Mn++)4(Fe++,Mn++)Al4(PO4)6(OH)4·12(H2O)
Dana No: 42.11.8.2 Strunz No: VII/D.31-20
Locality:

Notes: