Sinkankasite Mineral Data

Sinkankasite Mineral Data +

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General Sinkankasite Information

Chemical Formula:

H2MnAl(PO4)2(OH)·6(H2O)

Composition:

Molecular Weight = 398.98 gm

Manganese 13.77 % Mn 17.78 % MnO

Aluminum 6.76 % Al 12.78 % Al₂O₃

Phosphorus 15.53 % P 35.58 % P₂O₅

Hydrogen 3.79 % H 33.87 % H₂O

Oxygen 60.15 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

H₂Mn²⁺Al(PO₄)₂(OH)·6(H₂O)

Environment:

Pseudomorphs after triphylite and alterations of the same.

IMA Status:

Approved IMA 1984

Locality:

Barker pegmatite, SW of Keystone, Penninton County, South Dakota, USA. Link to MinDat.org Location Data.

Name Origin:

Named for John Sinkankas (1915-2002), Captain, U.S. Navy, and author of books on minerals and gems.

Synonym:

ICSD 80126

PDF 42-597

Sinkankasite Image

Images:

Sinkankasite

Comments: White crystalline spray of acicular sinkankasite to 1mm on matrix.
Location: Barker mine, Keystone, Pennington County, South Dakota, USA. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Sinkankasite Crystallography

Axial Ratios:

a:b:c =0.9785:1:0.7027

Cell Dimensions:

a = 9.58, b = 9.79, c = 6.88, Z = 2; alpha = 108.1°, beta = 99.6°, gamma = 98.7° V = 597.79 Den(Calc)= 2.22

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 9.2(1), 5.06(0.6), 5.41(0.5),2.7(0.4), 2.83(0.4), 2.43(0.3), 2.94(0.3), 4.13(0.2),

Crystal Structure:

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Burns P C , Hawthorne F C , American Mineralogist , 80 (1995) p.620-627, The crystal structure of sinkankasite, a complex heteropolyhedral sheet mineral

Physical Properties of Sinkankasite

Cleavage:

[100] Good, [100] Parting

Color:

Colorless, White.

Density:

2.27

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Pseudomorphous - Occurs in the form of another mineral.

Hardness:

4 - Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Sinkankasite

Gladstone-Dale:

CI meas= 0.038 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2378,KPDmeas= 0.2326,KC= 0.2417

Optical Data:

Biaxial (-), a=1.511, b=1.529, g=1.544, bire=0.0330, 2V(Calc)=82, 2V(Meas)=84. Dispersion r < v.

Calculated Properties of Sinkankasite

Electron Density:

r_electron=2.26 gm/cc
note: r_Sinkankasite=2.22 gm/cc.

Fermion Index

Fermion Index = 0.00029
Boson Index = 0.99971

Photoelectric:

PE_Sinkankasite= 4.38 barns/electron
U=PE_Sinkankasite x r_electron= 9.89 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sinkankasite is Not Radioactive

Sinkankasite Classification

Dana Class:

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

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.1)Dana Group

42.7.1.1 Childrenite FeAl(PO4)(OH)2·(H2O) Bba2 mm2

42.7.1.2 Eosphorite MnAl(PO4)(OH)2·(H2O) Bbam 2/m 2/m 2/m

42.7.1.3 Ernstite (Mn1-xFex)Al(PO4)(OH)2-xOx C 2/c or Cc Mono

42.7.1.4 Sinkankasite H2MnAl(PO4)2(OH)·6(H2O) P1 1

Strunz Class:

VII/D.04-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.04 - Mcauslanite - Sinkankasite series

VII/D.04-10 Mcauslanite HFe3Al2(PO4)4F·18(H2O) P1 1

VII/D.04-20 Sinkankasite H2MnAl(PO4)2(OH)·6(H2O) P1 1

Other Sinkankasite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Sinkankasite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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

Sinkankasite

H2MnAl(PO4)2(OH)·6(H2O)
Dana No: 42.7.1.4 Strunz No: VII/D.04-20
Locality:

Notes: