Hydrodelhayelite Mineral Data

Hydrodelhayelite Mineral Data +

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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

IMA Status:

Approved IMA 1979

Locality:

Link to MinDat.org Location Data.

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 - PyramidalH-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:

[???] Perfect

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

Optical Data:

Biaxial (?), a=1.503, g=1.518, bire=0.0150

Calculated Properties of Hydrodelhayelite

Electron Density:

r_electron=2.27 gm/cc
note: r_{Hydrodelhayelite}=2.24 gm/cc.

Fermion Index

Fermion Index = 0.01253
Boson Index = 0.98747

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)

Estimated Radioactivity from Hydrodelhayelite - barely detectable

Hydrodelhayelite Classification

Dana Class:

72.5.1.5 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.5)with corrugated and complex layers

(72.5.1)Rhodesite group

72.5.1.1 Rhodesite KHCa2Si8O19·5(H2O) Pmam 2/m 2/m 2/m

72.5.1.2 Monteregianite-(Y) (Na,K)6(Y,Ca)2Si16O38·10(H2O) P 2₁/m 2/m

72.5.1.3 Macdonaldite BaCa4[Si16O36(OH)2]·10(H2O) C mcm 2/m 2/m 2/m

72.5.1.4 Delhayelite (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3·18(H2O) Pnmm 2/m 2/m 2/m

72.5.1.5 Hydrodelhayelite KCa2AlSi7O17(OH)2·6(H2O) Pnm21 mm2

72.5.1.6 Seidite-(Ce)! Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4·5(H2O) C/2c 2/m

Strunz Class:

VIII/H.38-40 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with tetrahedral-double layers and related structures

VIII/H.38 - Monteregianite-(Y) - Wickenburgite series

VIII/H.38-10 Monteregianite-(Y) (Na,K)6(Y,Ca)2Si16O38·10(H2O) P 2₁/m 2/m

VIII/H.38-20 Rhodesite KHCa2Si8O19·5(H2O) Pmam 2/m 2/m 2/m

VIII/H.38-30 Delhayelite (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3·18(H2O) Pnmm 2/m 2/m 2/m

VIII/H.38-40 Hydrodelhayelite KCa2AlSi7O17(OH)2·6(H2O) Pnm21 mm2

VIII/H.38-50 Macdonaldite BaCa4[Si16O36(OH)2]·10(H2O) C mcm 2/m 2/m 2/m

VIII/H.38-60 Cymrite BaAl2Si2O8·(H2O) P 2₁ (pseudo-HEX) 2

VIII/H.38-65 Kampfite! Ba6[(Si,Al)O2]8(CO3)2Cl2(Cl,H2O)2 P 6₃mmc, P 6₂c, P 6₃mc, P 3₁ Hex

VIII/H.38-80 Lourenswalsite (K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12 Unk (pseudo-HEX) Hex

VIII/H.38-90 Wickenburgite Pb3CaAl2Si10O27·4(H2O) P 3₁c 3m

Other Hydrodelhayelite Information

References:

NAME( Dana8) 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Print or Cut-and-Paste your Hydrodelhayelite Specimen Label here :

Hydrodelhayelite

KCa2AlSi7O17(OH)2·6(H2O)
Dana No: 72.5.1.5 Strunz No: VIII/H.38-40
Locality:

Notes: