Mineralogy Database

Spheniscidite Mineral Data

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General Spheniscidite Information

Help on Chemical  Formula: Chemical Formula: (NH4,K)(Fe+++,Al)2(PO4)2(OH)•2(H2O)
Help on Composition: Composition: Molecular Weight = 413.28 gm
   Potassium    3.78 %  K     4.56 % K2O
   Aluminum     5.22 %  Al    9.87 % Al2O3
   Iron        22.97 %  Fe   32.84 % Fe2O3
   Phosphorus  14.99 %  P    34.35 % P2O5
   Hydrogen     0.59 %  H      -   % Calc as (NH4)2O
   Hydrogen     1.63 %  H    14.60 % H2O
   Nitrogen     2.03 %  N     3.78 % (NH4)2O
   Oxygen      48.78 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (NH4)0.6K0.4Fe3+1.7Al0.8(PO4)2(OH)2.5�2.1(H2O)
Help on Environment: Environment: Formed by interaction of phosphate solutions derived from quano with micacous and chloritic minerals in soil under a penguin rookery.
Help on IMA Status: IMA Status: Approved IMA 1986
Help on Locality: Locality: On Elephant Island, South Shetland Islands, about 800 km southeast of Cape Horn, British Antarctic Territory, Antartica. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for "Sphenisciformes," the Latin order name or penguins.
Help on Name Pronunciation: Name Pronunciation: Spheniscidite + Pronunciation Say SPHENISCIDITE
Help on Synonym: Synonym: ICSD 75229
  PDF 41-593

Spheniscidite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0124:1:1.0072
Help on Cell Dimensions: Cell Dimensions: a = 9.75, b = 9.63, c = 9.7, Z = 4; beta = 102.567° V = 888.94 Den(Calc)= 3.09
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.79(1), 5.99(0.9), 3.05(0.45),

Physical Properties of Spheniscidite

Help on Color: Color: Brown.
Help on Density: Density: 2.71
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Selvage - As a reaction rim, surrounding the host mineral.
Help on Hardness: Hardness: 1-1.5 - Talc or a little harder
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white

Optical Properties of Spheniscidite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.077 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2265,KPDmeas= 0.2583,KC= 0.2453
Ncalc = 1.66 - 1.76
Help on Optical Data: Optical Data: Biaxial (?), b=1.7

Calculated Properties of Spheniscidite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.71 gm/cc
note: Specific Gravity of Spheniscidite =2.71 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PESpheniscidite = 7.99 barns/electron
U=PESpheniscidite x relectron= 21.63 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 54.53 (Gamma Ray American Petroleum Institute Units)
Concentration of Spheniscidite per GRapi unit = 1.83 (%)

Estimated Radioactivity from Spheniscidite - barely detectable


Spheniscidite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.06)Leucophosphite Group Leucophosphite KFe2(PO4)2(OH)•2(H2O) P 21/n 2/m Tinsleyite KAl2(PO4)2(OH)•2(H2O) P 21/n 2/m Spheniscidite (NH4,K)(Fe,Al)2(PO4)2(OH)•2(H2O) P 21/n 2/m
Help on  Strunz Class: Strunz Class: 08.DH.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1
08.DH.10 Leucophosphite KFe2(PO4)2(OH)•2(H2O) P 21/n 2/m
08.DH.10 Spheniscidite (NH4,K)(Fe,Al)2(PO4)2(OH)•2(H2O) P 21/n 2/m
08.DH.10 Tinsleyite KAl2(PO4)2(OH)•2(H2O) P 21/n 2/m

Other Spheniscidite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Spheniscidite :
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.DH.10





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