Mineralogy Database

Dalyite Mineral Data

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General Dalyite Information

Help on Chemical  Formula: Chemical Formula: K2ZrSi6O15
Help on Composition: Composition: Molecular Weight = 571.59 gm
   Potassium  13.00 %  K    15.66 % K2O
   Sodium      0.04 %  Na    0.05 % Na2O
   Magnesium   0.09 %  Mg    0.14 % MgO
   Zirconium  14.36 %  Zr   19.40 % ZrO2
   Titanium    0.75 %  Ti    1.26 % TiO2
   Aluminum    0.05 %  Al    0.09 % Al2O3
   Iron        0.20 %  Fe    0.28 % Fe2O3
   Silicon    29.53 %  Si   63.18 % SiO2
   Oxygen     41.99 %  O
             ______        ______ 
             100.00 %      100.06 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K1.9Fe3+0.02Mg0.02Na0.01Zr0.9Ti0.09Al0.01Si6.01O15
Help on Environment: Environment: A rare accessory in ejected blocks of alkalic granite in trachytic and basaltic tuffs (Ascension Island); in syenite (Serra de Agua de Pau, Azores); in lamproite (Cancarix, Spain).
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1952
Help on Locality: Locality: Ascension Island. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Reginald Aldworth Daly (1871-1957), Professor of Geology, Harvard University, Cambridge, Massachusetts, USA.
Help on Name Pronunciation: Name Pronunciation: Dalyite Say DALYITE
Help on Synonym: Synonym: ICSD 22323
  PDF 23-1376

Dalyite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =0.9535:1:0.8941
Help on Cell Dimensions: Cell Dimensions: a = 7.371, b = 7.73, c = 6.912, Z = 1; alpha = 106.1°, beta = 111.48°, gamma = 100° V = 346.75 Den(Calc)= 2.74
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.08(1), 3.58(1), 4.2(1),

Physical Properties of Dalyite

Help on Cleavage: Cleavage: {101} Good, {010} Good, {100} Indistinct
Help on Color: Color: Colorless.
Help on Density: Density: 2.84
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Hardness: Hardness: 7.5 - Garnet
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Dalyite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.208,KPDmeas= 0.2073,KC= 0.2094
Ncalc = 1.59
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.76 gm/cc
note: Specific Gravity of Dalyite =2.83 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEDalyite = 21.55 barns/electron
U=PEDalyite x relectron= 59.57 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 183.21 (Gamma Ray American Petroleum Institute Units)
Concentration of Dalyite per GRapi unit = 0.55 (%)

Estimated Radioactivity from Dalyite - barely detectable


Dalyite Classification

Help on  Dana Class: Dana Class: (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.02)with 4-, 6-, and 8-membered rings
  (72.02.01)Dalylite group Dalyite K2ZrSi6O15 P1 1 Davanite K2TiSi6O15 P1 1 Sazhinite-(Ce) Na2Ce[Si6O14(OH)]•n(H2O),(n>=1.5) Pmm2 mm2 Sazhinite-(La)! Na3La[Si6O15]•2(H2O) Pmm2 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.EA.25 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EA -Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
09.EA.25 Dalyite K2ZrSi6O15 P1 1
09.EA.25 Davanite K2TiSi6O15 P1 1

Other Dalyite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Dalyite :
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.EA.25





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