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Killalaite

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Formula:
Ca
 
3
(Si
 
2
O
 
7
) · 0.5H
 
2
O
System:Monoclinic


Related to dellaite.

Classification of Killalaite

IMA status:Approved
Strunz 8th edition ID:8/C.09-50
Nickel-Strunz 10th (pending) edition ID:9.BE.85

9 : SILICATES (Germanates)
B : Sorosilicates
E : Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
Dana 8th edition ID:56.2.9.2

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
Hey's CIM Ref.:14.5.17

14 : Silicates not Containing Aluminum
5 : Silicates of Ca
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Type Occurrence of Killalaite

Type Locality:Inishcrone, Killala Bay, Co. Sligo, Ireland
Year of Discovery:1974

Crystallography of Killalaite

Crystal System:Monoclinic
Cell Parameters:a = 6.8Å, b = 15.45Å, c = 6.81Å
β = 97.76°
Ratio:a:b:c = 0.44 : 1 : 0.441
Unit Cell Volume:V 708.91 ų (Calculated from Unit Cell)

Optical Data of Killalaite

Type:Biaxial (-)
RI values: nα = 1.635 nγ = 1.642
2V:Measured: 26°
Maximum Birefringence:δ = 0.007

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

Chemical Properties of Killalaite

Formula:
Ca
 
3
(Si
 
2
O
 
7
) · 0.5H
 
2
O
Essential elements:Ca, H, O, Si
All elements listed in formula:Ca, H, O, Si

Relationship of Killalaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.BE.02Wadsleyite
(Mg,Fe
2+
 
)
 
2
(SiO
 
4
)
9.BE.05Hennomartinite
SrMn
3+
2
(Si
 
2
O
 
7
)(OH)
 
2
 · H
 
2
O
9.BE.05Lawsonite
CaAl
 
2
(Si
 
2
O
 
7
)(OH)
 
2
 · H
 
2
O
9.BE.05Noelbensonite
BaMn
3+
2
(Si
 
2
O
 
7
)(OH)
 
2
 · H
 
2
O
9.BE.05Itoigawaite
SrAl
 
2
(Si
 
2
O
 
7
)(OH)
 
2
 · H
 
2
O
9.BE.07Ilvaite
CaFe
2+
2
Fe
3+
 
(Si
 
2
O
 
7
)O(OH)
9.BE.07Manganilvaite
Ca(Mn
2+
 
,Fe
2+
 
)
 
2
Fe
3+
 
(Si
 
2
O
 
7
)O(OH)
9.BE.10Suolunite
Ca
 
2
(H
 
2
Si
 
2
O
 
7
) · H
 
2
O
9.BE.12Jaffeite
Ca
 
6
(Si
 
2
O
 
7
)(OH)
 
6
9.BE.15Fresnoite
Ba
 
2
Ti(Si
 
2
O
 
7
)O
9.BE.17Baghdadite
Ca
 
3
(Zr,Ti)(Si
 
2
O
 
7
)O
 
2
9.BE.17Burpalite
Na
 
2
CaZr(Si
 
2
O
 
7
)F
 
2
9.BE.17Cuspidine
Ca
 
4
(Si
 
2
O
 
7
)(F,OH)
 
2
9.BE.17Hiortdahlite
(Ca,Na)
 
3
(Zr,Ti)(Si
 
2
O
 
7
)(O,OH,F)
 
2
9.BE.17Janhaugite
(Na,Ca)
 
3
(Mn
2+
 
,Fe
2+
 
)
 
3
(Ti,Zr,Nb)
 
2
(Si
 
2
O
 
7
)
 
2
O
 
2
(OH,F)
 
2
9.BE.17Låvenite
(Na,Ca)
 
2
(Mn
2+
 
,Fe
2+
 
)(Zr,Ti)(Si
 
2
O
 
7
)(O,OH,F)
 
2
9.BE.17Niocalite
(Ca,Nb)
 
4
(Si
 
2
O
 
7
)(O,OH,F)
 
2
9.BE.17Normandite
NaCa(Mn,Fe)(Ti,Nb,Zr)(Si
 
2
O
 
7
)OF
9.BE.17Wöhlerite
NaCa
 
2
(Zr,Nb)(Si
 
2
O
 
7
)(O,OH,F)
 
2
9.BE.17Hiortdahlite I
Na
 
4
Ca
 
8
Zr
 
2
(Nb,Mn,Ti,Fe,Mg,Al)
 
2
(Si
 
2
O
 
7
)
 
4
O
 
3
F
 
5
9.BE.17Marianoite
Na
 
2
Ca
 
4
(Nb,Zr)
 
2
(Si
 
2
O
 
7
)
 
2
(O,F)
 
2
9.BE.20Mosandrite
Na
 
2
Ca
 
4
(REE)(Si
 
2
O
 
7
)
 
2
OF
 
3
9.BE.20Nacareniobsite-(Ce)
Na
 
3
Ca
 
3
(Ce,La,Nd)Nb(Si
 
2
O
 
7
)
 
2
OF
 
3
9.BE.22Götzenite
Na
 
2
Ca
 
5
Ti(Si
 
2
O
 
7
)
 
2
F
 
4
9.BE.22Hainite
Na
 
4
Ca
 
8
(Ti,Zr,Mn)
 
3
(Si
 
2
O
 
7
)
 
4
F
 
4
9.BE.22Rosenbuschite
(Ca,Na)
 
3
(Zr,Ti)(Si
 
2
O
 
7
)OF
9.BE.22Kochite
(Na,Ca)
 
3
Ca
 
2
(Mn,Ca)ZrTi(Si
 
2
O
 
7
)
 
2
(F,O)
 
4
9.BE.23Dovyrenite
Ca
 
6
Zr(Si
 
2
O
 
7
)
 
2
(OH)
 
4
9.BE.25Barytolamprophyllite
(Ba,Na)
 
2
(Na,Ti,Fe
3+
 
)
 
4
Ti
 
2
(Si
 
2
O
 
7
)
 
2
O(OH,F)
9.BE.25Ericssonite
BaMn
2+
2
Fe
3+
 
(Si
 
2
O
 
7
)O(OH)
9.BE.25Lamprophyllite
(Sr,K,Ba)
 
2
(Na,Ti,Mn
2+
 
,Fe
3+
 
)
 
4
Ti
 
2
(Si
 
2
O
 
7
)
 
2
O(O,OH,F)
9.BE.25Ericssonite-2O
BaMn
2+
2
Fe
3+
 
(Si
 
2
O
 
7
)O(OH)
9.BE.25Seidozerite
Na
 
8
Mn
2+
2
Zr
 
3
Ti
 
3
(Si
 
2
O
 
7
)
 
4
O
 
4
F
 
4
9.BE.25Nabalamprophyllite
Na
 
3
(Ba,Na)
 
2
Ti
 
3
(Si
 
2
O
 
7
)
 
2
O
 
2
(OH,F)
 
2
9.BE.25Grenmarite
(Zr,Mn)
 
2
(Zr,Ti)(Mn,Na)(Na,Ca)
 
4
(Si
 
2
O
 
7
)
 
2
(O,F)
 
4
9.BE.27Murmanite
Na
 
2
Ti
 
2
(Si
 
2
O
 
7
)O
 
2
 · 2H
 
2
O
9.BE.30Epistolite
Na
 
2
(Nb,Ti)
 
2
(Si
 
2
O
 
7
)O
 
2
 · nH
 
2
O
9.BE.32Lomonosovite
Na
 
5
Ti
 
2
(Si
 
2
O
 
7
)(PO
 
4
)O
 
2
9.BE.35Vuonnemite
Na
 
11
Ti
4+
 
Nb
 
2
(Si
 
2
O
 
7
)
 
2
(PO
 
4
)
 
2
O
 
3
(F,OH)
9.BE.37Sobolevite
Na
 
13
Ca
 
2
Mn
 
2
Ti
 
3
(Si
 
2
O
 
7
)
 
2
(PO
 
4
)
 
4
O
 
3
F
 
3
9.BE.40Innelite
Na
 
2
CaBa
 
4
Ti
 
3
(Si
 
2
O
 
7
)
 
2
(SO
 
4
)
 
2
O
 
4
9.BE.40Phosphoinnelite
Na
 
3
Ba
 
4
Ti
 
3
(Si
 
2
O
 
7
)
 
2
(PO
 
4
,SO
 
4
)
 
2
O
 
2
F
9.BE.42Yoshimuraite
Ba
 
2
Mn
 
2
Ti(Si
 
2
O
 
7
)(PO
 
4
)O(OH)
9.BE.45Quadruphite
Na
 
14
Ca
 
2
Ti
 
4
(Si
 
2
O
 
7
)
 
2
(PO
 
4
)
 
2
O
 
2
F
9.BE.47Polyphite
Na
 
5
(Na
 
4
Ca
 
2
)Ti
 
2
(Si
 
2
O
 
7
)(PO
 
4
)
 
3
O
 
2
F
 
2
9.BE.50Bornemanite
Na
 
6
BaTi
 
2
Nb(Si
 
2
O
 
7
)
 
2
(PO
 
4
)O
 
2
(OH)F
9.BE.50Shkatulkaite
Na
 
10
Mn
2+
 
Ti
 
3
Nb
 
3
(Si
 
2
O
 
7
)
 
6
(OH)
 
2
F · 12H
 
2
O
9.BE.55Bafertisite
Ba(Fe
3+
 
,Mn
2+
 
)
 
2
Ti(Si
 
2
O
 
7
)O(O,OH)
 
2
9.BE.55Hejtmanite
Ba(Mn
2+
 
,Fe
2+
 
)
 
2
Ti(Si
 
2
O
 
7
)O(OH,F)
9.BE.55Bykovaite
(Ba,Na,K)
 
2
(Na,Ti,Mn)
 
4
(Ti,Nb)
 
2
(Si
 
2
O
 
7
)
 
2
O
 
2
(H
 
2
O,F,OH)
 
2
 · 3.5H
 
2
O
9.BE.55Nechelyustovite
(Ba,Sr,K)
 
2
(Na,Ti,Mn)
 
4
(Ti,Nb)
 
2
(Si
 
2
O
 
7
)
 
2
O
 
2
(O,H
 
2
O,F)
 
2
 · 4.5H
 
2
O
9.BE.60Delindeite
(Na,K)
 
2
(Ba,Ca)
 
2
(Ti,Fe,Al)
 
3
(Si
 
2
O
 
7
)
 
2
O
 
2
(OH)
 
2
 · 2H
 
2
O
9.BE.65Bussenite
Na
 
2
Ba
 
2
Fe
2+
 
Ti(Si
 
2
O
 
7
)(CO
 
3
)(OH)
 
3
F
9.BE.67Jinshajiangite
BaNaFe
2+
4
Ti
 
2
(Si
 
2
O
 
7
)
 
2
O
 
2
(OH)
 
2
F
9.BE.67Perraultite
BaNaMn
2+
4
Ti
 
2
 (Si
 
2
O
 
7
)
 
2
O
 
2
(OH)
 
2
F
9.BE.67Surkhobite
NaCaBa
 
2
Mn
 
8
Ti
 
4
(Si
 
2
O
 
7
)
 
4
O
 
5
F
 
5
9.BE.70Karnasurtite-(Ce)
(Ce,La,Th)(Ti,Nb)(Al,Fe)(Si
 
2
O
 
7
)(OH)
 
4
 · 3H
 
2
O
9.BE.70Perrierite-(Ce)
(Ce,Ca,Th)
 
4
(Mg,Fe
2+
 
)Fe
3+
2
(Ti,Fe
3+
 
)
 
2
(Si
 
2
O
 
7
)
 
2
O
 
8
9.BE.70Strontiochevkinite
(Sr,La,Ce,Ca)
 
4
Fe
2+
 
(Ti,Zr)
 
2
Ti
 
2
(Si
 
2
O
 
7
)
 
2
O
 
8
9.BE.70Chevkinite-(Ce)
(Ce,La,Ca,Th)
 
4
(Fe
2+
 
,Mg)(Fe
2+
 
,Ti,Fe
3+
 
)
 
2
(Ti,Fe
3+
 
)
 
2
(Si
 
2
O
 
7
)
 
2
O
 
8
9.BE.70Polyakovite-(Ce)
(Ce,Ca)
 
4
(Mg,Fe
2+
 
)(Cr
3+
 
,Fe
3+
 
)
 
2
(Ti,Nb)
 
2
(Si
 
2
O
 
7
)
 
2
O
 
8
9.BE.70Rengeite
Sr
 
4
ZrTi
 
4
(Si
 
2
O
 
7
)
 
2
O
 
8
9.BE.70Matsubaraite
Sr
 
4
Ti
 
5
(Si
 
2
O
 
7
)
 
2
O
 
8
9.BE.70Dingdaohengite-(Ce)
(Ce,La)
 
4
Fe
2+
 
(Ti,Fe
2+
 
,Mg,Fe
2+
 
)
 
2
Ti
 
2
(Si
 
2
O
 
7
)
 
2
O
 
8
9.BE.70Maoniupingite-(Ce)
(Ce,Ca)
 
4
(Fe
3+
 
,Ti,Fe
2+
 
,◻)(Ti,Fe
3+
 
,Fe
2+
 
,Nb)
 
4
(Si
 
2
O
 
7
)
 
2
O
 
8
9.BE.70Perrierite-(La)
(La,Ce,Ca)
 
4
(Fe,Mn
2+
 
,Mg)Fe
3+
2
(Ti,Fe
3+
 
)
 
2
(Si
 
2
O
 
7
)
 
2
O
 
8
9.BE.70UKI-2008-(SiO:SrTiZr)
Sr
 
4
ZrTi
 
4
(Si
 
2
O
 
7
)
 
2
O
 
8
9.BE.72Fersmanite
Ca
 
4
(Na,Ca)
 
4
(Ti,Nb)
 
4
(Si
 
2
O
 
7
)
 
2
O
 
8
F
 
3
9.BE.75Belkovite
Ba
 
3
(Nb,Ti)
 
6
(Si
 
2
O
 
7
)
 
2
O
 
12
9.BE.77Nasonite
Pb
 
6
Ca
 
4
(Si
 
2
O
 
7
)
 
3
Cl
 
2
9.BE.80Kentrolite
Pb
 
2
Mn
3+
2
(Si
 
2
O
 
7
)O
 
2
9.BE.80Melanotekite
Pb
 
2
Fe
3+
2
(Si
 
2
O
 
7
)O
 
2
9.BE.82Tilleyite
Ca
 
5
(Si
 
2
O
 
7
)(CO
 
3
)
 
2
9.BE.87Stavelotite-(La)
(La,Nd,Ca)
 
3
Mn
2+
3
Cu(Mn
3+
 
,Fe
3+
 
,Mn
4+
 
)
 
26
(Si
 
2
O
 
7
)
 
6
O
 
5
9.BE.90Biraite-(Ce)
Ce
 
2
Fe
2+
 
(Si
 
2
O
 
7
)(CO
 
3
)
9.BE.92Cervandonite-(Ce)
(Ce,Nd,La)(Fe
3+
 
,Fe
2+
 
,Ti,Al)
 
3
O
 
2
(Si
 
2
O
 
7
)(As
3+
 
O
 
3
)(OH)
9.BE.95Batisivite
BaV
3+
8
Ti
 
6
(Si
 
2
O
 
7
)O
 
22
Related Minerals - Hey's Index Grouping:

- +
14.5.1Wollastonite
CaSiO
 
3
14.5.2Wollastonite-7T
14.5.3Wollastonite-2M
CaSiO
 
3
14.5.4Rankinite
Ca
 
3
Si
 
2
O
 
7
14.5.5Kilchoanite
Ca
 
3
Si
 
2
O
 
7
14.5.6Larnite
Ca
 
2
SiO
 
4
14.5.7Bredigite
Ca
 
7
Mg(SiO
 
4
)
 
4
14.5.8Hatrurite
Ca
 
3
(SiO
 
4
)O
14.5.9Rosenhahnite
HCa
 
3
[Si
 
3
O
 
9
(OH)]
14.5.10Dellaite
Ca
 
6
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
14.5.11Afwillite
Ca
 
3
(HSiO
 
4
)
 
2
 · 2H
 
2
O
14.5.12Xonotlite
Ca
 
6
(Si
 
6
O
 
17
)(OH)
 
2
14.5.13Foshagite
Ca
 
4
(Si
 
3
O
 
9
)(OH)
 
2
14.5.14Hillebrandite
Ca
 
2
(SiO
 
3
)(OH)
 
2
14.5.15Jaffeite
Ca
 
6
(Si
 
2
O
 
7
)(OH)
 
6
14.5.16Suolunite
Ca
 
2
(H
 
2
Si
 
2
O
 
7
) · H
 
2
O
14.5.18Okenite
CaSi
 
2
O
 
5
 · 2H
 
2
O
14.5.19Riversideite
Ca
 
5
(HSi
 
3
O
 
9
)
 
2
 · 2H
 
2
O
14.5.20Trabzonite
Ca
 
4
(Si
 
3
O
 
10
) · 2H
 
2
O
14.5.21Gyrolite
Ca
 
4
(Si
 
6
O
 
15
)(OH)
 
2
 · 3H
 
2
O
14.5.22Foshallasite
Ca
 
3
[Si
 
2
O
 
7
] · 3H
 
2
O(?)
14.5.23Tobermorite
Ca
 
4+x
(H
 
2-2x
Si
 
6
O
 
17
) · 5H
 
2
O
14.5.24Clinotobermorite
Ca
 
5
(Si
 
6
O
 
17
) · 5H
 
2
O
14.5.25Nekoite
Ca
 
3
Si
 
6
O
 
15
·7H
 
2
O
14.5.26Plombièrite
Ca
 
5
(HSi
 
3
O
 
9
)
 
2
 · 7H
 
2
O
14.5.27Jennite
Ca
 
9
(Si
 
3
O
 
9
)
 
2
(OH)
 
8
 · 8H
 
2
O

Other Names for Killalaite

Synonyms:
IMA1973-033
Other Languages:
German:Killalait
Russian:Киллалаит
Spanish:Killalaita

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 Killalaite

Reference List:

- +
American Mineralogist (1974): 59: 1331.

Mineralogical Magazine: 41: 363-369.

Internet Links for Killalaite

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  • Raman and XRD data at RRUFF project
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  • Killalaite details from Handbook of Mineralogy (PDF)
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    • Localities for Killalaite

    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.
    Hide Locality List
    (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.
    Ireland
     
    • Co. Sligo
      • Killala Bay
    		Min.Mag.(1974) 39, 544-548
    Japan
     
    • Honshu Island
      • Chugoku Region
        • Hiroshima prefecture
          • Hiba-gun
    		Kusachi et al (1984) Koubutsu-Gakkai Kou'en-Youshi, 100.
    Turkey
     
    • Black Sea Region
      • Rize Province
    		Am Min 73:11-12 p 1497
    UK
     
    • Northern Ireland
      • Co. Antrim
        • Glenoe
    		Nawaz, R. (1977). A second occurrence of killalaite. Mineralogical Magazine, 41, 546-548.
    Mineral and/or Locality
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