Dalyite Mineral Data

Dalyite Mineral Data +

General Dalyite Information

Chemical Formula:

K2ZrSi6O15

Composition:

Molecular Weight = 577.92 gm

Potassium 13.53 % K 16.30 % K₂O

Zirconium 15.78 % Zr 21.32 % ZrO₂

Silicon 29.16 % Si 62.38 % SiO₂

Oxygen 41.53 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂ZrSi₆O₁₅

IMA Status:

Valid Species (Pre-IMA) 1952

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 22323

PDF 23-1376

Dalyite Image

Images:

Dalyite Janhaugite

Comments: Tan crystalline dalyite (arrow) with reddish brown janhaugite.
Location: Gjerdingen, Nordmark, north of Oslo, Oslo, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dalyite Crystallography

Axial Ratios:

a:b:c =0.9702:1:0.9055

Cell Dimensions:

a = 7.5, b = 7.73, c = 7, Z = 1; alpha = 106°, beta = 113.5°, gamma = 99.5° V = 352.84 Den(Calc)= 2.72

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.08(1), 3.58(1), 4.2(1),

Crystal Structure:

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Fleet S G , Zeitschrift fur Kristallographie , 121 (1965) p.349-368, The crystal structure of dalyite

Physical Properties of Dalyite

Cleavage:

[101] Good, [010] Good, [100] Indistinct

Color:

Colorless.

Density:

2.84

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

7.5 - Garnet

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Dalyite

Gladstone-Dale:

CI meas= -0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.047 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2164,KPDmeas= 0.2073,KC= 0.2067

Optical Data:

Biaxial (-), a=1.575, b=1.59, g=1.601, bire=0.0260, 2V(Calc)=80, 2V(Meas)=72.

Calculated Properties of Dalyite

Electron Density:

r_electron=2.77 gm/cc
note: r_Dalyite=2.84 gm/cc.

Fermion Index

Fermion Index = 0.03154
Boson Index = 0.96846

Photoelectric:

PE_Dalyite= 23.29 barns/electron
U=PE_Dalyite x r_electron= 64.56 barns/cc.

Radioactivity:

GRapi = 190.53 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Dalyite - barely detectable

Dalyite Classification

Dana Class:

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

(72.2)with 4-, 6-, and 8-membered rings

(72.2.1)Dalylite group

72.2.1.1 Dalyite K2ZrSi6O15 P1 1

72.2.1.2 Davanite K2TiSi6O15 P1 1

72.2.1.3 Sazhinite-(Ce) Na2Ce[Si6O14(OH)]·n(H2O),(n>=1.5) Pmm2 mm2

72.2.1.4 IMA2002-042a! Na3La[Si6O15]·2(H2O) Pmm2 2/m 2/m 2/m

Strunz Class:

VIII/H.03-20 VIII - Silicates

VIII/H - Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others

VIII/H.03 - Sanbornite series

VIII/H.03-10 Davanite K2TiSi6O15 P1 1

VIII/H.03-20 Dalyite K2ZrSi6O15 P1 1

Other Dalyite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Dalyite

K2ZrSi6O15
Dana No: 72.2.1.1 Strunz No: VIII/H.03-20
Locality:

Notes: