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 % 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

Empirical Formula:

K•6(H₂O)Ca₂AlSi₇O₁₇(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

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

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_{Hydrodelhayelite}= 2.93 barns/electron
U=PE_{Hydrodelhayelite} 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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