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Kilchoanite

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Formula:
Ca6(SiO4)(Si3O10)
Originally assumed to be Ca3Si2O7.
System:
Orthorhombic
This page provides mineralogical data about Kilchoanite.

Classification of Kilchoanite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.BJ.45

9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination
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)
14.5.5

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

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°
Max Birefringence:
δ = 0.003
Image 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:
Ca6(SiO4)(Si3O10)

Originally assumed to be Ca3Si2O7.
Essential elements:
All elements listed in formula:
Common Impurities:
Fe,Al

Relationship of Kilchoanite to other Species

9.BJ.05OrientiteCa8Mn103+(SiO4)3(Si3O10)3(OH)10 · 4H2O
9.BJ.10RosenhahniteHCa3[Si3O9(OH)]
9.BJ.15TrabzoniteCa4(Si3O9)(OH)2
9.BJ.20Thalénite-(Y)Y3Si3O10F
9.BJ.25TiragalloiteMn42+(HAsSi3O13)
9.BJ.30Medaite(Mn,Ca)6(V,As)Si5O18OH
9.BJ.35RuiziteCa2Mn23+[(OH)2|H2Si4O13] · 2H2O
9.BJ.40Ardennite-(As)Mn42+Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6
9.BJ.40Ardennite-(V)Mn42+Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6
9.BJ.50KornerupineMg3Al6(Si,Al,B)5O21(OH)
9.BJ.50Prismatine(◻,Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22
9.BJ.55ZunyiteAl13Si5O20(OH,F)18Cl
9.BJ.60HubeiteCa2Mn2+Fe3+[HSi4O13] · 2H2O
9.BJ.65Cassagnaite(Ca,Mn2+)4(Fe3+,Mn3+,Al)4(V3+,Mg,Al)2(Si3O10)(SiO4)2(OH,O)8
14.5.1WollastoniteCaSiO3
14.5.2Wollastonite-7T
14.5.3Wollastonite-2MCaSiO3
14.5.4RankiniteCa3Si2O7
14.5.6LarniteCa2SiO4
14.5.7BredigiteCa7Mg(SiO4)4
14.5.8HatruriteCa3(SiO4)O
14.5.9RosenhahniteHCa3[Si3O9(OH)]
14.5.10DellaiteCa6(Si2O7)(SiO4)(OH)2
14.5.11AfwilliteCa3(HSiO4)2 · 2H2O
14.5.12XonotliteCa6(Si6O17)(OH)2
14.5.13FoshagiteCa4(Si3O9)(OH)2
14.5.14HillebranditeCa2(SiO3)(OH)2
14.5.15JaffeiteCa6(Si2O7)(OH)6
14.5.16SuoluniteCa2(H2Si2O7) · H2O
14.5.17KillalaiteCa6.4(H0.6Si2O7)2(OH)2
14.5.18OkeniteCa10Si18O46 · 18H2O
14.5.19RiversideiteCa5(HSi3O9)2 · 2H2O
14.5.20TrabzoniteCa4(Si3O9)(OH)2
14.5.21GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
14.5.22FoshallasiteCa3[Si2O7] · 3H2O(?)
14.5.23Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
14.5.24Clinotobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
14.5.25NekoiteCa3Si6O15·7H2O
14.5.26Plombièrite[Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O)
14.5.27JenniteCa9(Si3O9)2(OH)8 · 8H2O

Other Names for Kilchoanite

Name in Other Languages:

Other Information

Health Risks:
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

Localities for Kilchoanite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Italy
 
  • Veneto
    • Padova Province
      • Galzignano Terme
        • Euganei Hills
Zorzi F. and Boscardin M. (2014): Minerali del Veneto. Alla scoperta dei tesori della nostra regione. Cierre Ed.. Sommacampagna (VR), p. 332.
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 (TL)
 
  • Scotland
    • North West Highlands
      • 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.
Mineral and/or Locality  
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