Mineralogy Database

Ikaite Mineral Data

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General Ikaite Information

Help on Chemical  Formula: Chemical Formula: CaCO3•6(H2O)
Help on Composition: Composition: Molecular Weight = 208.18 gm
   Calcium   19.25 %  Ca   26.94 % CaO
   Hydrogen   5.81 %  H    51.92 % H2O
   Carbon     5.77 %  C    21.14 % CO2
   Oxygen    69.17 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca(CO3)•6(H2O)
Help on Environment: Environment: In cold, saline marine waters where the formation of calcite is inhibited. Decomposes into water and calcite above 8 deg. C.
Help on IMA Status: IMA Status: Approved IMA 1963
Help on Locality: Locality: Ika Fjord, Ivigtut, Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Ikaite Say IKAITE
Help on Synonym: Synonym: Fundylite (calcite pseudomorphs)
  Glendonite (calcite pseudomorphs)
  ICSD 31305
  Jarrowite (calcite pseudomorphs)
  PDF 37-416
  Thinolite (calcite pseudomorphs)

Ikaite Image

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Comments: Rounded, colorless crystals of ikaite extracted from Antarctic sea ice cores. Ikaite may be more common than previously thought.
Location: Southern sea near the Antarctic shore. Scale: See Image.
© Geophyscial Research Letters

Ikaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0777:1:1.339
Help on Cell Dimensions: Cell Dimensions: a = 8.87, b = 8.23, c = 11.02, Z = 4; beta = 110.2° V = 754.98 Den(Calc)= 1.83
Help on Crystal System: Crystal System: Monoclinic Space Group: C 2/c or Cc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.17(1), 2.64(0.9), 2.63(0.7),2.8(0.5), 2.46(0.3), 2.61(0.3), 4.16(0.3), 5.85(0.3), 4.16(0.3),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 2 2 1) ( 1 1 0) ( 1 1 0) ( 2 2 1)

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Physical Properties of Ikaite

Help on Color: Color: Chalky white.
Help on Density: Density: 1.77 - 1.8, Average = 1.78
Help on Habit: Habit: Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white

Optical Properties of Ikaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2801,KPDmeas= 0.2872,KC= 0.2777
Ncalc = 1.49 - 1.51
Help on Optical Data: Optical Data: Biaxial (-), a=1.455, b=1.538, g=1.545, bire=0.0900, 2V(Calc)=30, 2V(Meas)=45. Dispersion distinct.

Calculated Properties of Ikaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.93 gm/cc
note: Specific Gravity of Ikaite =1.83 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0012352742
Boson Index = 0.9987647258
Help on Photoelectric: Photoelectric: PEIkaite = 2.49 barns/electron
U=PEIkaite x rElectron Density= 4.82 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ikaite is Not Radioactive

Ikaite Classification

Help on  Dana Class: Dana Class: (15)Hydrated Carbonates
  (15.01)where A+ (XO3) � x(H2O)
  (15.01.04)Dana Group Ikaite CaCO3•6(H2O) C 2/c or Cc Mono
Help on  Strunz Class: Strunz Class: 05.CB.25 05 - CARBONATES (NITRATES)
  05.C - Carbonates without Additional Anions, with H2O
  05.CB -With large cations (alkali and alkali-earth carbonates)
05.CB.25 Ikaite CaCO3•6(H2O) C 2/c or Cc Mono

Other Ikaite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Ikaite :
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: 05.CB.25





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