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Kilchoanite

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Formula:
Ca
 
6
(SiO
 
4
)(Si
 
3
O
 
10
)
Originally assumed to be Ca3Si2O7.
System:Orthorhombic
This page provides mineralogical data about Kilchoanite.

Classification of Kilchoanite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/C.03-20
Nickel-Strunz 10th (pending) edition ID:9.BJ.45

9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination
Dana 8th edition ID:58.3.2.1

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
3 : Insular, Mixed, Single, and Larger Tetrahedral Groups with insular single and triple groups (n=1, 3)
Hey's CIM Ref.:14.5.5

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

Type Locality:Kilchoan, Ardnamurchan, North West Highlands (Argyllshire), Scotland, UK
Year of Discovery:1961

Crystallography of Kilchoanite

Crystal System:Orthorhombic
Cell Parameters:a = 11.42Å, b = 5.09Å, c = 21.95Å
Ratio:a:b:c = 2.244 : 1 : 4.312
Unit Cell Volume:V 1,275.91 ų (Calculated from Unit Cell)

Optical Data of Kilchoanite

Type:Biaxial (+)
RI values: nα = 1.647 nβ = 1.649 nγ = 1.650
2V:Measured: 60° , Calculated: 70°
Maximum Birefringence:δ = 0.003

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 Kilchoanite

Formula:
Ca
 
6
(SiO
 
4
)(Si
 
3
O
 
10
)


Originally assumed to be Ca3Si2O7.
Simplified for copy/paste:Ca6(SiO4)(Si3O10)
Essential elements:Ca, O, Si
All elements listed in formula:Ca, O, Si
Common Impurities:Fe,Al

Relationship of Kilchoanite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.BJ.05Orientite
Ca
 
2
Mn
2+
 
Mn
3+
2
(Si
 
3
O
 
10
)(OH)
 
4
9.BJ.10Rosenhahnite
HCa
 
3
[Si
 
3
O
 
9
(OH)]
9.BJ.15Trabzonite
Ca
 
4
(Si
 
3
O
 
10
) · 2H
 
2
O
9.BJ.20Thalénite-(Y)
Y
 
3
(Si
 
3
O
 
10
)(OH)
9.BJ.20Fluorthalénite-(Y)
Y
 
3
(Si
 
3
O
 
10
)F
9.BJ.25Tiragalloite
Mn
2+
4
(HAsSi
 
3
O
 
13
)
9.BJ.30Medaite
(Mn,Ca)
 
6
(V,As)Si
 
5
O
 
18
OH
9.BJ.35Ruizite
Ca
 
2
Mn
3+
2
[(OH)
 
2
|H
 
2
Si
 
4
O
 
13
] · 2H
 
2
O
9.BJ.40Ardennite-(As)
Mn
2+
4
(Al,Mg)
 
6
(Si
 
3
O
 
10
)(SiO
 
4
)
 
2
(AsO
 
4
,VO
 
4
)(OH)
 
6
9.BJ.40Ardennite-(V)
Mn
2+
4
Al
 
4
(Mg,Al,Fe
3+
 
,Mn
3+
 
)
 
2
(Si
 
3
O
 
10
)(SiO
 
4
)
 
2
(VO
 
4
,SiO
 
4
)(OH)
 
6
9.BJ.50Kornerupine
Mg
 
3
Al
 
6
(Si,Al,B)
 
5
O
 
21
(OH)
9.BJ.50Prismatine
(◻,Fe,Mg)(Mg,Al,Fe)
 
5
Al
 
4
Si
 
2
(Si,Al)
 
2
(B,Si,Al)(O,OH,F)
 
22
9.BJ.55Zunyite
Al
 
13
Si
 
5
O
 
20
(OH,F)
 
18
Cl
9.BJ.60Hubeite
Ca
 
2
Mn
2+
 
Fe
3+
 
[HSi
 
4
O
 
13
] · 2H
 
2
O
9.BJ.65Cassagnaite
(Ca,Mn
2+
 
)
 
4
(Fe
3+
 
,Mn
3+
 
,Al)
 
4
(V
3+
 
,Mg,Al)
 
2
(Si
 
3
O
 
10
)(SiO
 
4
)
 
2
(OH,O)
 
8
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
14.5.6Larnite
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
14.5.17Killalaite
Ca
 
6.4
(H
 
0.6
Si
 
2
O
 
7
)
 
2
(OH)
 
2
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
NaCa
 
16
Si
 
23
AlO
 
60
(OH)
 
8
· 14H
 
2
O
14.5.22Foshallasite
Ca
 
3
[Si
 
2
O
 
7
] · 3H
 
2
O(?)
14.5.23Tobermorite
[Ca
 
4
Si
 
6
O
 
17
· 2H
 
2
O]·(Ca·3H
 
2
O)
14.5.24Clinotobermorite
[Ca
 
4
Si
 
6
O
 
17
· 2H
 
2
O]·(Ca·3H
 
2
O)
14.5.25Nekoite
Ca
 
3
Si
 
6
O
 
15
·7H
 
2
O
14.5.26Plombièrite
[Ca
 
4
Si
 
6
O
 
16
(OH)
 
2
· 2H
 
2
O]·(Ca·5H
 
2
O)
14.5.27Jennite
Ca
 
9
(Si
 
3
O
 
9
)
 
2
(OH)
 
8
· 8H
 
2
O

Other Names for Kilchoanite

Other Languages:
German:Kilchoanit
Russian:Килхоанит
Spanish:Kilchoanita

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 Kilchoanite

Reference List:

- +
American Mineralogist (1961): 46: 1203.

Taylor, H. F. W. (1971): Crystal structure of kilchoanite, Ca6(SiO4)(Si3O10), with some comments on related phases. Mineralogical Magazine 38, 26-31.

Internet Links for Kilchoanite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Kilchoanite details from Handbook of Mineralogy (PDF)
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  • Search for Kilchoanite on Well-Arranged Molecules
  • Localities for Kilchoanite

    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.
    (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.
    Israel
     
    • Negev
    Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
    Japan
     
    • Honshu Island
      • Chugoku Region
        • Okayama Prefecture
          • Takahashi City
            • Bicchu-cho (Bitchu-cho)
              • Fuka
    Henmi et al (1975) Koubutsugaku Zasshi, 12, 205-214.
    New Zealand
     
    • North Island
      • Northland
        • Kaipara
    Black, P. M. (1969): Rankinite and kilchoanite from Tokatoka, New Zealand. Mineralogical Magazine 37, 517-519.
    Romania
     
    • Brașov Co.
      • Racoş Commune
    Szakáll, S., Kristály, F., 2010. Mineralogy of Székelyland, Eastern Transylvania, Romania. Sfântu Gheorghe-Miercurea Ciuc-Târgu Mureş. 2010.
    • Harghita Co.
      • Odorheiu Secuiesc (Székelyudvarhely; Oderhellen)
        • Racoş (Racoşu de Jos)
    Szakáll, S. & Kristály, F., Eds. (2010): Mineralogy of Székelyland, Eastern Transylvania, Romania. Csík County Nature and Conservation Society, Miercurea-Ciuc, Romania, 321 pp.
    Russia
     
    • Eastern-Siberian Region
      • Prebaikalia (Pribaikal'e)
        • Irkutskaya Oblast'
          • Narin-Kunta
    Savel'eva V.B., Uschapovskaya Z.F., Nartova N.V. (1992) On kilchoanite rock from Priolkhonie (Western Pribaikalie), // Zapiski VMO, v.121, N3, pp. 111-117 (in Rus.)
    UK
     
    • Scotland
      • North West Highlands (Argyllshire)
        • Ardnamurchan
    Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Mineralogical Magazine 1965 34 : 1-15.
    USA
     
    • Texas
      • Brewster Co.
        • Christmas Mts
    Rocks & Minerals (1991): 66:3: 196-224.
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