Sinkankasite Mineral Data
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 % Al2 O3
Phosphorus 15.53 % P 35.58 % P2 O5
Hydrogen 3.79 % H 33.87 % H2 O
Oxygen 60.15 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
H2 Mn2+ Al(PO4 )2 (OH)•6(H2 O)
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.
Name Pronunciation:
Sinkankasite + Pronunciation
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 - Pinacoidal H-M Symbol ( 1 ) Space Group: P1
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
Cleavage:
{100} Good, {100} Parting
Color:
Colorless, White.
Density:
2.27
Diaphaneity:
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 = 0.025 (Excellent) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2357,KPDmeas = 0.2326,KC = 0.2417 Ncalc = 1.54 - 1.55
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:
Bulk Density (Electron Density)=2.28 gm/cc note: Specific Gravity of Sinkankasite =2.24 gm/cc.
Fermion Index:
Fermion Index = 0.0002944117 Boson Index = 0.9997055883
Photoelectric:
PESinkankasite = 4.38 barns/electronU=PESinkankasite x r Electron Density= 9.98 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Sinkankasite is Not Radioactive
Sinkankasite Classification
Dana Class:
42.07.01.04 (42) Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
(42.07) where (AB)5 (XO4)3 Zq � x(H2O)
(42.07.01) Childrenite Group
42.07.01.01 Childrenite FeAl(PO4)(OH)2•(H2O) Bba2 mm2
42.07.01.02 Eosphorite MnAl(PO4)(OH)2•(H2O) Bbam 2/m 2/m 2/m
42.07.01.03 Ernstite (Mn1-xFex)Al(PO4)(OH)2-xOx C 2/c or Cc Mono
42.07.01.04 Sinkankasite H2MnAl(PO4)2(OH)•6(H2O) P1 1
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
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 - 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
15 - WWW-MINCRYST
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Sinkankasite
H2MnAl(PO4)2(OH)•6(H2O)
Dana No: 42.07.01.04 Strunz No: 08.DB.20
Locality:
Notes:
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