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Dalyite

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Gjerdingselva (Gjerdingen), Nordmarka, Lunner, Oppland, Norway
© OT. Ljostad

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Formula:
K
 
2
ZrSi
 
6
O
 
15
System:TriclinicColour:Colourless
Lustre:VitreousHardness:7½
Name: Named for R.A.Daly
This page provides mineralogical data about Dalyite.

Classification of Dalyite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/H.03-20
Nickel-Strunz 10th (pending) edition ID:9.EA.25

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
Dana 8th edition ID:72.2.1.1

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
2 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-, 6-, and 8-membered rings
Hey's CIM Ref.:14.10.14

14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf
mindat.org URL:http://www.mindat.org/min-1214.html
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Type Occurrence of Dalyite

Type Locality:Green Mountain, Ascension Island, Saint Helena
Year of Discovery:1952

Physical Properties of Dalyite

Lustre:Vitreous
Colour:Colourless
Hardness (Mohs):7½

Crystallography of Dalyite

Crystal System:Triclinic
Cell Parameters:a = 7.51Å, b = 7.73Å, c = 7Å
α = 106°, β = 113.5°, γ = 99.5°
Ratio:a:b:c = 0.972 : 1 : 0.906
Unit Cell Volume:V 340.35 ų (Calculated from Unit Cell)

Optical Data of Dalyite

Type:Biaxial (-)
RI values: nα = 1.575 nβ = 1.590 nγ = 1.601
2V:Measured: 72° , Calculated: 80°
Maximum Birefringence:δ = 0.026

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:very weak

Chemical Properties of Dalyite

Formula:
K
 
2
ZrSi
 
6
O
 
15
Essential elements:K, O, Si, Zr
All elements listed in formula:K, O, Si, Zr
Common Impurities:Ti,Al,Fe,Mn,Mg,Ca,Ba,P

Relationship of Dalyite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.EA.05Cuprorivaite
CaCu[Si
 
4
O
 
10
]
9.EA.05Gillespite
BaFe
2+
 
[Si
 
4
O
 
10
]
9.EA.05Effenbergerite
BaCu[Si
 
4
O
 
10
]
9.EA.05Wesselsite
SrCu[Si
 
4
O
 
10
]
9.EA.10Ekanite
(Ca,Fe
2+
 
,Pb)
 
2
(Th,U)[Si
 
8
O
 
20
]
9.EA.15Apophyllite-(KF)
KCa
 
4
[(F,OH)|Si
 
8
O
 
20
] · 8H
 
2
O
9.EA.15Apophyllite-(KOH)
KCa
 
4
[(OH,F)|Si
 
8
O
 
20
] · 8H
 
2
O
9.EA.15Apophyllite-(NaF)
NaCa
 
4
[F|Si
 
8
O
 
20
] · 8H
 
2
O
9.EA.20Magadiite
NaSi
 
7
O
 
13
(OH)
 
3
·3H
 
2
O
9.EA.25Davanite
K
 
2
TiSi
 
6
O
 
15
9.EA.30Sazhinite-(Ce)
Na
 
3
Ce[Si
 
6
O
 
15
] · 6H
 
2
O
9.EA.30Sazhinite-(La)
Na
 
3
La[Si
 
6
O
 
15
] · 2H
 
2
O
9.EA.35Armstrongite
CaZr[Si
 
6
O
 
15
]·3H
 
2
O
9.EA.40Okenite
CaSi
 
2
O
 
5
·2H
 
2
O
9.EA.45Nekoite
Ca
 
3
Si
 
6
O
 
15
·7H
 
2
O
9.EA.50Cavansite
Ca(VO)Si
 
4
O
 
10
·4H
 
2
O
9.EA.55Pentagonite
Ca(VO)Si
 
4
O
 
10
·4H
 
2
O
9.EA.60Penkvilksite
(Na,Ca)
 
4
(Ti,Zr)
 
2
Si
 
8
O
 
22
·5H
 
2
O
9.EA.60Tumchaite
Na
 
2
Zr(Si
 
4
O
 
11
)·2H
 
2
O
9.EA.65Nabesite
Na
 
2
BeSi
 
4
O
 
10
 * 4 H
 
2
O
9.EA.70Ajoite
(K,Na)Cu
 
7
[(OH)
 
6
|AlSi
 
9
O
 
24
] · 3H
 
2
O
9.EA.75Zeravshanite
Cs
 
4
Na
 
2
Zr
 
3
[Si
 
18
O
 
45
](H
 
2
O)
 
2
Related Minerals - Hey's Index Grouping:

- +
14.10.1Zircon
Zr[SiO
 
4
]
14.10.2Hafnon
(Hf,Zr)[SiO
 
4
]
14.10.3Zektzerite
LiNa(Zr,Ti,Hf)Si
 
6
O
 
15
14.10.4Parakeldyshite
Na
 
2
ZrSi
 
2
O
 
7
14.10.5Vlasovite
Na
 
2
ZrSi
 
4
O
 
11
14.10.6Keldyshite
(Na,H)
 
2
ZrSi
 
2
O
 
7
14.10.7Gaidonnayite
Na
 
2
Zr[Si
 
3
O
 
9
]·2H
 
2
O
14.10.8Terskite
Na
 
4
ZrSi
 
6
O
 
16
·2H
 
2
O
14.10.9Elpidite
Na
 
2
ZrSi
 
6
O
 
15
·3H
 
2
O
14.10.10Hilairite
Na
 
2
Zr[SiO
 
3
]
 
3
·3H
 
2
O
14.10.11Petarasite
Na
 
5
Zr
 
2
[(OH,Cl)|Si
 
6
O
 
18
]·2H
 
2
O
14.10.12Khibinskite
K
 
2
ZrSi
 
2
O
 
7
14.10.13Wadeite
K
 
2
Zr[Si
 
3
O
 
9
]
14.10.15Kostylevite
K
 
2
ZrSi
 
3
O
 
9
·H
 
2
O
14.10.16Umbite
K
 
2
(Zr,Ti)Si
 
3
O
 
9
·H
 
2
O
14.10.17Paraumbite
K
 
3
Zr
 
2
H(Si
 
3
O
 
9
)
 
2
·nH
 
2
O
14.10.18Georgechaoite
NaKZr[Si
 
3
O
 
9
]·2H
 
2
O
14.10.19Gittinsite
CaZr[Si
 
2
O
 
7
]
14.10.20Calciocatapleiite
CaZrSi
 
3
O
 
9
·2H
 
2
O
14.10.21Calciohilairite
CaZr[SiO
 
3
]
 
3
·3H
 
2
O
14.10.22Armstrongite
CaZr[Si
 
6
O
 
15
]·3H
 
2
O
14.10.23Lemoynite
(Na,K)
 
2
CaZr
 
2
Si
 
10
O
 
26
·5H
 
2
O
14.10.24Catapleiite
Na
 
2
Zr[Si
 
3
O
 
9
]·2H
 
2
O
14.10.25Baghdadite
Ca
 
3
(Zr,Ti)[O
 
2
|Si
 
2
O
 
7
]
14.10.26Lovozerite
(Na,Ca)
 
3
(Zr,Ti)[Si
 
6
(O,OH)
 
18
]
14.10.27Låvenite
(Na,Ca)
 
2
(Mn
2+
 
,Fe
2+
 
)(Zr,Ti)[(O,OH,F)
 
2
|Si
 
2
O
 
7
]
14.10.28Penkvilksite
(Na,Ca)
 
4
(Ti,Zr)
 
2
Si
 
8
O
 
22
·5H
 
2
O
14.10.29Darapiosite
KNa
 
2
Li(Mn,Zn)
 
2
ZrSi
 
12
O
 
30
14.10.30Bazirite
BaZr[Si
 
3
O
 
9
]
14.10.31Komkovite
BaZr[Si
 
3
O
 
9
]·3H
 
2
O
14.10.32Zirsinalite
Na
 
6
(Ca,Mn
2+
 
,Fe
2+
 
)Zr[Si
 
6
O
 
18
]
14.10.33Tranquillityite
(Fe
2+
 
,Ca)
 
8
(Zr,Y)
 
2
Ti
 
3
[O
 
4
|SiO
 
4
]
 
3

Other Names for Dalyite

Other Languages:
German:Dalyit
Russian:Дэлиит
Spanish:Dalyita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Dalyite

Reference List:American Mineralogist: 37: 1071.

Mineralogical Magazine: 29: 850-857.

Zeitschrift für Kristallographie, Kristallgeometrie, Kristallphysik, Kristallchemie: 121: 349-368.

Articles/Blogs about Dalyite

Internet Links for Dalyite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Dalyite in the Natural History Museum (London) online catalogue
  • Dalyite details from Handbook of Mineralogy (PDF)
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    Localities for Dalyite

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    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Antarctica
     
    • Eastern Antarctica
      • Queen Maud Land (Dronning Maud Land)
    		Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
    Canada
     
    • Newfoundland and Labrador
      • Labrador
    		Miller (1996), Can.Min.: 34:349-371; Salvi & Williams-Jones (1995); Am.Min.: 80:1031-1040; Miller (1990), Newfoundland Dept. of Mines & Energy Geol. Sur. Report 90-1: 171-182.
    Namibia
     
    • Erongo Region
      • Brandberg District
        • Brandberg area
    		Economic Geology, Vol. 97, 2002, pp. 399–413
    Norway
     
    • Oppland
      • Lunner
        • Nordmarka
    		G. Raade: "Gjerdingen-ekeritten, en unik mineralforekomst", Norsk Bergverksmuseum Skrift nr. 30, 2005, p17.
    Portugal
     
    • Azores District
      • San Miguel Island
    		Cann, J.R.: A second occurrence of dalyite..., Min.Mag.36, 227-232; Mineralogical Magazine, August 2003, V. 67, N° 4, pp. 749-767.
    Russia
     
    • Eastern-Siberian Region
      • Saha Republic (Sakha Republic; Yakutia)
        • Aldan Shield
          • Torgo River Basin
            • Davan
              • Chara River (Charo River)
    		[Lapis 1993:4 p.13-20]
    Saint Helena
     
    • Ascension Island
    		Min.Mag.(1952) 29, 850-857
    Min.Mag.(1952) 29, 850-857
    Spain
     
    • Castile-La Mancha
      • Albacete
        • Cancarix
    		E. Salvioli-mariani et al. , Eur. J. Mineral. , 1996, 8, pp. 1027-1039.
    USA
     
    • Montana
      • Meagher Co.
    		www.cseg.ca/conferences/2000/376.PDF.
    Mineral and/or Locality
    Google
     
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