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Hydrodelhayelite Mineral Data

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General Hydrodelhayelite Information

Help on Chemical  Formula: Chemical Formula: KCa2AlSi7O17(OH)2•6(H2O)
Help on Composition: Composition: Molecular Weight = 756.93 gm
   Potassium   5.17 %  K     6.22 % K2O
   Calcium    10.59 %  Ca   14.82 % CaO
   Aluminum    3.56 %  Al    6.74 % Al2O3
   Silicon    25.97 %  Si   55.57 % SiO2
   Hydrogen    1.86 %  H    16.66 % H2O
   Oxygen     52.84 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K•6(H2O)Ca2AlSi7O17(OH)2
Help on Environment: Environment: A secondary alteration product of delhayelite from ijolite-urtite pegmatites in a differentiated alkalic massif.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: On Mts. Rasvumchorr and Yukspor, in the Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its relation to delhayelite, and the water in its composition.
Help on Name Pronunciation: Name Pronunciation: Hydrodelhayelite + Pronunciation Say HYDRODELHAYELITE
Help on Synonym: Synonym: Monteregianite

Hydrodelhayelite Image

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Comments: Tan platy crystalline hydrodelhayelite in white syenite matrix.
Location: Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hydrodelhayelite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.2787:1:0.2966
Help on Cell Dimensions: Cell Dimensions: a = 6.648, b = 23.846, c = 7.073, Z = 2; V = 1,121.27 Den(Calc)= 2.24
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: Pnm21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.923(1), 3.069(0.75), 2.8(0.55),

Physical Properties of Hydrodelhayelite

Help on Cleavage: Cleavage: {010} Perfect, {001} Imperfect
Help on Color: Color: White, Pearl gray.
Help on Density: Density: 2.168
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Hydrodelhayelite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (?), a=1.503, g=1.518, bire=0.0150

Calculated Properties of Hydrodelhayelite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.27 gm/cc
note: Specific Gravity of Hydrodelhayelite =2.24 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEHydrodelhayelite = 2.93 barns/electron
U=PEHydrodelhayelite x relectron= 6.65 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.05)with corrugated and complex layers
  (72.05.01)Rhodesite group Rhodesite KHCa2Si8O19•5(H2O) Pmam 2/m 2/m 2/m Monteregianite-(Y) (Na,K)6(Y,Ca)2Si16O38•10(H2O) P 21/m 2/m Macdonaldite BaCa4[Si16O36(OH)2]•10(H2O) C mcm 2/m 2/m 2/m Delhayelite (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3•18(H2O) Pnmm 2/m 2/m 2/m Hydrodelhayelite KCa2AlSi7O17(OH)2•6(H2O) Pnm21 mm2 Seidite-(Ce)! Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4•5(H2O) C/2c 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(List of New Min. Names,28-33th,1974-1984) OPTIC PROP.(List of New Min. Names,28-33th,197)
Help on See Also: 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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Dana No: Strunz No: 09.EB.10





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