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Sinkankasite Mineral Data

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General Sinkankasite Information

Help on Chemical  Formula: Chemical Formula: H2MnAl(PO4)2(OH)•6(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: H2Mn2+Al(PO4)2(OH)•6(H2O)
Help on Environment: Environment: Pseudomorphs after triphylite and alterations of the same.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Barker pegmatite, SW of Keystone, Penninton County, South Dakota, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for John Sinkankas (1915-2002), Captain, U.S. Navy, and author of books on minerals and gems.
Help on Name Pronunciation: Name Pronunciation: Sinkankasite + Pronunciation Say SINKANKASITE
Help on Synonym: Synonym: ICSD 80126
  PDF 42-597

Sinkankasite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.9785:1:0.7027
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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),

Physical Properties of Sinkankasite

Help on Cleavage: Cleavage: {100} Good, {100} Parting
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.27
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Pseudomorphous - Occurs in the form of another mineral.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: white

Optical Properties of Sinkankasite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.038 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2357,KPDmeas= 0.2326,KC= 0.2417
Ncalc = 1.54 - 1.55
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.28 gm/cc
note: Specific Gravity of Sinkankasite =2.24 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002944117
Boson Index = 0.9997055883
Help on Photoelectric: Photoelectric: PESinkankasite = 4.38 barns/electron
U=PESinkankasite x rElectron Density= 9.98 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sinkankasite is Not Radioactive

Sinkankasite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.07)where (AB)5 (XO4)3 Zq � x(H2O)
  (42.07.01)Childrenite Group Childrenite FeAl(PO4)(OH)2•(H2O) Bba2 mm2 Eosphorite MnAl(PO4)(OH)2•(H2O) Bbam 2/m 2/m 2/m Ernstite (Mn1-xFex)Al(PO4)(OH)2-xOx C 2/c or Cc Mono Sinkankasite H2MnAl(PO4)2(OH)•6(H2O) P1 1
Help on  Strunz Class: Strunz Class: 08.DB.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DB -With only medium-sized cations, (OH, etc.):RO4 < 1:1
08.DB.20 Sinkankasite H2MnAl(PO4)2(OH)•6(H2O) P1 1

Other Sinkankasite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Sinkankasite :
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

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Dana No: Strunz No: 08.DB.20





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