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Kilchoanite

Big Photo

Ozernovskii (Ozerskii) Massif, Lake Baikal area, Irkutskaya Oblast', Prebaikalia (Pribaykalye), Eastern-Siberian Region, Russia
© B. Otter

Formula:
Ca
 
3
Si
 
2
O
 
7
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
 
3
Si
 
2
O
 
7
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
MnMn
 
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
 
4
AsSi
 
3
O
 
12
(OH)
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
][(OH)
 
6
|(AsO
 
4
,VO
 
4
)|(SiO
 
4
)
 
2
|Si
 
3
O
 
10
]
9.BJ.40Ardennite-(V)
Mn
2+
4
[Al
 
4
(Mg,Al,Fe
3+
 
,Mn
3+
 
)
 
2
][(OH)
 
6
|(VO
 
4
,SiO
 
4
)|(SiO
 
4
)
 
2
|Si
 
3
O
 
10
]
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
[(O,OH)
 
4
|(OH)
 
4
|(SiO
 
4
)
 
2
|Si
 
3
O
 
10
]
Related Minerals - Hey's Index Grouping:
14.5.1Wollastonite
Ca[SiO
 
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
[O|SiO
 
4
]
14.5.9Rosenhahnite
HCa
 
3
[Si
 
3
O
 
9
(OH)]
14.5.10Dellaite
Ca
 
6
Si
 
3
O
 
11
(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
[(OH)
 
2
|Si
 
3
O
 
9
]
14.5.14Hillebrandite
Ca
 
2
[(OH)
 
2
|SiO
 
3
]
14.5.15Jaffeite
Ca
 
6
[(OH)
 
6
|Si
 
2
O
 
7
]
14.5.16Suolunite
Ca
 
2
[H
 
2
Si
 
2
O
 
7
] · H
 
2
O
14.5.17Killalaite
Ca
 
3
[Si
 
2
O
 
7
] · 0.5H
 
2
O
14.5.18Okenite
CaSi
 
2
O
 
5
·2H
 
2
O
14.5.19Riversideite
Ca
 
5
Si
 
6
O
 
16
(OH)
 
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
 
5
Si
 
6
(O,OH)
 
18
·5H
 
2
O
14.5.24Clinotobermorite
Ca
 
5
[Si
 
3
O
 
8
(OH)
 
2
]2.4H
 
2
O - Ca
 
5
[Si
 
6
O17]·5H
 
2
O
14.5.25Nekoite
Ca
 
3
Si
 
6
O
 
15
·7H
 
2
O
14.5.26Plombièrite
Ca
 
5
Si
 
6
O
 
16
(OH)
 
2
·7H
 
2
O
14.5.27Jennite
Ca
 
9
H
 
2
Si
 
6
O
 
18
(OH)
 
8
·6H
 
2
O

Other Names for Kilchoanite

German names:
Kilchoanit
Russian names:
Килхоанит
Spanish names:
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

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    Localities for Kilchoanite

    (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
     
    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
            • Bitchu-cho (Bicchu-cho)
    New Zealand
     
    • North Island
      • Northland
        • Kaipara
    		Black, P. M. (1969): Rankinite and kilchoanite from Tokatoka, New Zealand. Mineralogical Magazine 37, 517-519.
    Russia
     
    • Eastern-Siberian Region
      • Prebaikalia (Pribaykalye)
        • Irkutskaya Oblast'
          • Lake Baikal area
    		B Otter collection
    UK
     
    • Scotland
      • North West Highlands (Argyllshire)
        • Ardnamurchan
    		Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
    USA
     
    • Texas
      • Brewster Co.
        • Christmas Mts
    		Rocks & Minerals (1991): 66:3: 196-224.
    Mineral and/or Locality
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