Hydrodelhayelite Mineral Data
General Hydrodelhayelite Information
Chemical Formula:
KCa2AlSi7O17(OH)2•6(H2O)
Composition:
Molecular Weight = 756.93 gm
Potassium 5.17 % K 6.22 % K2 O
Calcium 10.59 % Ca 14.82 % CaO
Aluminum 3.56 % Al 6.74 % Al2 O3
Silicon 25.97 % Si 55.57 % SiO2
Hydrogen 1.86 % H 16.66 % H2 O
Oxygen 52.84 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
K•6(H2 O)Ca2 AlSi7 O17 (OH)2
Environment:
A secondary alteration product of delhayelite from ijolite-urtite pegmatites in a differentiated alkalic massif.
IMA Status:
Approved IMA 1979
Locality:
On Mts. Rasvumchorr and Yukspor, in the Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Name Origin:
Named for its relation to delhayelite, and the water in its composition.
Name Pronunciation:
Hydrodelhayelite + Pronunciation
Synonym:
Monteregianite
Hydrodelhayelite Image
Images:
Hydrodelhayelite Crystallography
Axial Ratios:
a:b:c =0.2787:1:0.2966
Cell Dimensions:
a = 6.648, b = 23.846, c = 7.073, Z = 2; V = 1,121.27 Den(Calc)= 2.24
Crystal System:
Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Pnm21
X Ray Diffraction:
By Intensity(I/Io ): 2.923(1), 3.069(0.75), 2.8(0.55),
Physical Properties of Hydrodelhayelite
Cleavage:
{010} Perfect, {001} Imperfect
Color:
White, Pearl gray.
Density:
2.168
Hardness:
4 - Fluorite
Luster:
Vitreous (Glassy)
Optical Properties of Hydrodelhayelite
Gladstone-Dale:
CI meas = -0.026 (Excellent) - where the CI = (1-KPDmeas /KC ) CI calc = 0.007 (Superior) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2279,KPDmeas = 0.2355,KC = 0.2295 Ncalc = 1.5 - 1.51
Optical Data:
Biaxial (?), a=1.503, g=1.518, bire=0.0150
Calculated Properties of Hydrodelhayelite
Electron Density:
Bulk Density (Electron Density)=2.27 gm/cc note: Specific Gravity of Hydrodelhayelite =2.24 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEHydrodelhayelite = 2.93 barns/electronU=PEHydrodelhayelite x r electron = 6.65 barns/cc.
Radioactivity:
GRapi = 75.61 (Gamma Ray American Petroleum Institute Units)
Concentration of Hydrodelhayelite per GRapi unit = 1.32 (%)
Estimated Radioactivity from Hydrodelhayelite - barely detectable
Hydrodelhayelite Classification
Dana Class:
72.05.01.05 (72) Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
(72.05) with corrugated and complex layers
(72.05.01) Rhodesite group
72.05.01.01 Rhodesite KHCa2Si8O19•5(H2O) Pmam 2/m 2/m 2/m
72.05.01.02 Monteregianite-(Y) (Na,K)6(Y,Ca)2Si16O38•10(H2O) P 21 /m 2/m
72.05.01.03 Macdonaldite BaCa4[Si16O36(OH)2]•10(H2O) C mcm 2/m 2/m 2/m
72.05.01.04 Delhayelite (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3•18(H2O) Pnmm 2/m 2/m 2/m
72.05.01.05 Hydrodelhayelite KCa2AlSi7O17(OH)2•6(H2O) Pnm21 mm2
72.05.01.06 Seidite-(Ce) ! Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4•5(H2O) C/2c 2/m
Strunz Class:
09.EB.10 09 - SILICATES (Germanates)
09.E - Phyllosilicates
09.EB -Double nets with 4- and 6-membered rings
09.EB.10 Delhayelite (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3•18(H2O) Pnmm 2/m 2/m 2/m
09.EB.10 Hydrodelhayelite KCa2AlSi7O17(OH)2•6(H2O) Pnm21 mm2
Other Hydrodelhayelite Information
References:
NAME( AntBidBlaNic2) PHYS. PROP.(List of New Min. Names,28-33th,1974-1984) OPTIC PROP.(List of New Min. Names,28-33th,197)
See Also:
Links to other databases for Hydrodelhayelite :
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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Hydrodelhayelite
KCa2AlSi7O17(OH)2•6(H2O)
Dana No: 72.05.01.05 Strunz No: 09.EB.10
Locality:
Notes:
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