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Motukoreaite Mineral Data |
General Motukoreaite Information |
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Na2Mg38Al24(CO3)13(SO4)8(OH)108•56(H2O) | ||
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Molecular Weight = 6,011.40 gm | ||
Sodium 0.76 % Na 1.03 % Na2O | |||
Magnesium 15.36 % Mg 25.48 % MgO | |||
Aluminum 10.77 % Al 20.35 % Al2O3 | |||
Hydrogen 3.69 % H 32.97 % H2O | |||
Carbon 2.60 % C 9.52 % CO2 | |||
Sulfur 4.27 % S 10.65 % SO3 | |||
Oxygen 62.55 % O | |||
______ ______ | |||
100.00 % 100.00 % = TOTAL OXIDE | |||
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Na2Mg38Al24(CO3)13(SO4)8(OH)108•56(H2O) | ||
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Rim cement in volcanic breccias in weathered submarine environments. | ||
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Approved IMA 1977 | ||
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Brown's Island, (Motukorea) within Waitemata Harbor, New Zealand. Link to MinDat.org Location Data. | ||
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Named for the Maori name for the locality (Motukorea - "island of the cormorants."). | ||
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Motukoreaite + Pronunciation ![]() |
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ICSD 29523 | ||
PDF 41-1380 | |||
Motukoreaite Image | |||
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Motukoreaite Crystallography |
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a:c = 1:3.65351 | ||
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a = 9.172, c = 33.51, Z = 0.4; V = 2,441.37 Den(Calc)= 1.64 | ||
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Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m | ||
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By Intensity(I/Io): 11.32(1), 3.72(0.7), 5.58(0.6),4.59(0.6), 2.58(0.4), 1.924(0.3), 2.39(0.3), | ||
Physical Properties of Motukoreaite |
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{???} Perfect | ||
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Yellow green, White, Light yellow. | ||
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1.48 - 1.53, Average = 1.5 | ||
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Fibrous - Crystals made up of fibers. | ||
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Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) | ||
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1-1.5 - Talc or a little harder | ||
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white | ||
Optical Properties of Motukoreaite |
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CI meas= -0.377 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.264 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.311,KPDmeas= 0.3389,KC= 0.2461 Ncalc = 1.36 - 1.4 |
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Uniaxial (?), a=1.51, b=1.51, bire=0.0000. | ||
Calculated Properties of Motukoreaite |
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Bulk Density (Electron Density)=1.69 gm/cc note: Specific Gravity of Motukoreaite =1.64 gm/cc. |
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Fermion Index = 0.01 Boson Index = 0.99 |
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PEMotukoreaite = 1.05 barns/electron U=PEMotukoreaite x rElectron Density= 1.77 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Motukoreaite is Not Radioactive |
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Motukoreaite Classification |
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17.01.07.01 (17)Compound Carbonates | ||
(17.01)with miscellaneous formulae | |||
(17.01.07)Dana Group | |||
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07.DD.35 07 - SULFATES (SELENATES, TELLURATES) | ||
07.D - Sulfates (selenates, etc.) with additional anions, with H2O | |||
07.DD -With only medium-sized cations; sheets of edge-sharing octahedra | |||
Other Motukoreaite Information |
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NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
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Links to other databases for Motukoreaite : 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 Search for Motukoreaite using: Visit our Advertisers for Motukoreaite : Ask about Motukoreaite here : Print or Cut-and-Paste your Motukoreaite Specimen Label here :
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