Hydrodelhayelite Mineral Data

[Newest Minerals] [Equipment] [Analytical Services] [About Us] [Mineral Gallery] [eBay Store]
See Also: [Diamond Crystals] [Mineral News] [Hudson Institute] [Minerals on CDROM]
Rare Minerals, Meteorites, Equipment and Analytical Services
Excalibur Mineral Company, World leaders in the supply of rare species
Serving the scientific and collector communities since 1974

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 - 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:

{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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Hydrodelhayelite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Hydrodelhayelite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Hydrodelhayelite Mineral Data :

Ask about Hydrodelhayelite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Hydrodelhayelite

KCa2AlSi7O17(OH)2•6(H2O)
Dana No: 72.05.01.05 Strunz No: 09.EB.10
Locality:

Notes: