General Ikaite Information
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 Chemical Formula: |
CaCO3•6(H2O) |
| Composition: |
Molecular Weight = 208.18 gm |
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Calcium 19.25 % Ca 26.94 % CaO |
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Hydrogen 5.81 % H 51.92 % H2O |
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Carbon 5.77 % C 21.14 % CO2 |
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Oxygen 69.17 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Ca(CO3)•6(H2O) |
| Environment: |
In cold, saline marine waters where the formation of calcite is inhibited. Decomposes into water and calcite above 8 deg. C. |
| IMA Status: |
Approved IMA 1963 |
| Locality: |
Ika Fjord, Ivigtut, Greenland. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Ikaite  |
| Synonym: |
Fundylite (calcite pseudomorphs) |
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Glendonite (calcite pseudomorphs) |
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ICSD 31305 |
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Jarrowite (calcite pseudomorphs) |
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PDF 37-416 |
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Thinolite (calcite pseudomorphs) |
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Ikaite Image |
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Images:
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Ikaite
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 |
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Ikaite Crystallography
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| Axial Ratios: |
a:b:c =1.0777:1:1.339 |
| Cell Dimensions: |
a = 8.87, b = 8.23, c = 11.02, Z = 4; beta = 110.2° V = 754.98 Den(Calc)= 1.83 |
| Crystal System: |
MonoclinicSpace Group: C 2/c or Cc |
| 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), |
| Forms:
Mouse
Dbl Clk - Start-Stop Rotation
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Drag1 - Manipulate Crystal
Drag2 - Resize
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S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
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Help on Above
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Forms:
( 2 2 1)
( 1 1 0)
( 1 1 0)
( 2 2 1)
Warning: this large pop-up is very compute intensive and
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Crystal Structure:
Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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Help on Above
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Hesse K F , Kuppers H , Suess E , Zeitschrift fur Kristallographie , 163 (1983) p.227-231, Refinement of the structure of ikaite, CaCO3*6(H2O), Locality: Bransfield Strait, Antarctica
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Physical Properties of Ikaite
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| Color: |
Chalky white. |
| Density: |
1.77 - 1.8, Average = 1.78 |
| Habit: |
Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite). |
| Habit: |
Tabular - Form dimensions are thin in one direction. |
| Luster: |
Earthy (Dull) |
| Streak: |
white |
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Optical Properties of Ikaite
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| 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 |
| Optical Data: |
Biaxial (-), a=1.455, b=1.538, g=1.545, bire=0.0900, 2V(Calc)=30, 2V(Meas)=45. Dispersion distinct. |
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Calculated Properties of Ikaite
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| Electron Density: |
Bulk Density (Electron Density)=1.93 gm/cc
note: Specific Gravity of Ikaite =1.83 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0012352742
Boson Index = 0.9987647258 |
| Photoelectric: |
PEIkaite = 2.49 barns/electron
U=PEIkaite x rElectron Density= 4.82 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ikaite is Not Radioactive |
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Ikaite Classification
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| Dana Class: |
15.01.04.01 (15)Hydrated Carbonates |
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(15.01)where A+ (XO3) � x(H2O) |
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(15.01.04)Dana Group |
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15.01.04.01 Ikaite CaCO3•6(H2O) C 2/c or Cc Mono |
| Strunz Class: |
05.CB.25 05 - CARBONATES (NITRATES) |
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05.C - Carbonates without Additional Anions, with H2O |
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05.CB -With large cations (alkali and alkali-earth carbonates) |
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05.CB.25 Ikaite CaCO3•6(H2O) C 2/c or Cc Mono |
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Other Ikaite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) |
| 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
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Ikaite Specimen Label here :
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Ikaite
CaCO3•6(H2O)
Dana No: 15.01.04.01 Strunz No: 05.CB.25
Locality:
Notes:
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