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Rankinite

Big Photo

Caspar quarry, Ettringer Bellerberg Mt. (Bellberg Mt.; Bellenberg Mt.; Billenberg Mt.; Boilenberg Mt.), Bellerberg volcano, Ettringen, Mayen, Eifel Mts, Rhineland-Palatinate, Germany
© C.H.M.Schäfer

Formula:
Ca
 
3
Si
 
2
O
 
7
System:MonoclinicColour:Colourless
Hardness:5½
Name:Named after George Atwater Rankin, physical chemist at the Geophysical Laboratory.
This page provides mineralogical data about Rankinite.

Classification of Rankinite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/C.03-10
Nickel-Strunz 10th (pending) edition ID:9.BC.15

9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
Dana 8th edition ID:55.3.1.1

55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
3 : Si2O7 Groups, Generally with no Additional Anions with cations in [7] coordination
Hey's CIM Ref.:14.5.4

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

Type Locality:Scawt Hill, Larne, Co. Antrim, Northern Ireland, UK
Year of Discovery:1942

Physical Properties of Rankinite

Colour:Colourless
Hardness (Mohs):5½

Crystallography of Rankinite

Crystal System:Monoclinic
Cell Parameters:a = 10.55Å, b = 8.88Å, c = 7.85Å
β = 119.58°
Ratio:a:b:c = 1.188 : 1 : 0.884
Unit Cell Volume:V 639.57 ų (Calculated from Unit Cell)

Optical Data of Rankinite

Type:Biaxial (+)
RI values: nα = 1.640 - 1.641 nβ = 1.644 nγ = 1.650
2V:Measured: 64° , Calculated: 72° to 80°
Maximum Birefringence:δ = 0.010

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

Chemical Properties of Rankinite

Formula:
Ca
 
3
Si
 
2
O
 
7
Essential elements:Ca, O, Si
All elements listed in formula:Ca, O, Si

Relationship of Rankinite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.BC.05Gittinsite
CaZr[Si
 
2
O
 
7
]
9.BC.05Keiviite-(Y)
(Y,Yb)
 
2
[Si
 
2
O
 
7
]
9.BC.05Keiviite-(Yb)
(Yb,Y)
 
2
[Si
 
2
O
 
7
]
9.BC.05Thortveitite
(Sc,Y)
 
2
[Si
 
2
O
 
7
]
9.BC.05Yttrialite-(Y)
(Y,Th)
 
2
[Si
 
2
O
 
7
]
9.BC.10Keldyshite
(Na,H)
 
2
ZrSi
 
2
O
 
7
9.BC.10Khibinskite
K
 
2
ZrSi
 
2
O
 
7
9.BC.10Parakeldyshite
Na
 
2
ZrSi
 
2
O
 
7
9.BC.20Barysilite
Pb
 
8
Mn
2+
 
[Si
 
2
O
 
7
]
 
3
9.BC.25Edgarbaileyite
(Hg-Hg)
 
3
[Si
 
2
O
 
7
]
9.BC.30Kristiansenite
Ca
 
2
ScSn(Si
 
2
O
 
7
)(Si
 
2
O
 
6
OH)
9.BC.35Percleveite-(Ce)
(Ce,La,Nd)
 
2
[Si
 
2
O
 
7
]
Related Minerals - Hey's Index Grouping:

- +
14.5.1Wollastonite
Ca[SiO
 
3
]
14.5.2Wollastonite-7T
14.5.3Wollastonite-2M
CaSiO
 
3
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
[O|SiO
 
4
]
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
[(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
O
 
17
]·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 Rankinite

Other Languages:
German:Rankinit
Russian:Ранкинит
Spanish:Rankinita

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 Rankinite

Reference List:C. E. Tilley Tricalcium Disilicate (Rankinite), a New Mineral from Scawt Hill, Co. Antrim Mineralogical Magazine 1942 26 : 190-196

American Mineralogist (1942): 27: 720.

Mineralogical Journal: 8: 38-47.

Mineralogical Journal: 8: 240-246.

Physics and Chemistry of Minerals (1987): 14: 542.

Internet Links for Rankinite

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    Localities for Rankinite

    Hide Locality List
    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.
    France
     
    • Midi-Pyrénées
      • Aveyron
    		Eytier J.R. & Ch., Favreau G., Devouard B., Vigier J. (2004), Minéraux de pyrométamorphisme de Lapanouse-de Sévérac (Aveyron), Cahier des Micromonteurs, n°85, pp: 3-58
    Germany
     
    • Rhineland-Palatinate
      • Eifel Mts
        • Mayen
          • Ettringen
            • Bellerberg volcano
              • Ettringer Bellerberg Mt. (Bellberg Mt.; Bellenberg Mt.; Billenberg Mt.; Boilenberg Mt.)
    		[Blass, G., Graf, H.W., Neue mineralogische Erkenntnisse und neue Funde aus Eifel, Schwarzwald und Siegerland, Mineralien-Welt 7/2, 55, 1996] [A. Wittern: Mineralfundorte in Deutschland, Schweizerbart (Stuttgart), 2001]
    Israel
     
    • Negev desert
    		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)
    		Mineralogical Journal Vol. 8 (1975) , No. 1 pp38-47
    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
      • Krasnoyarsk Territory (Krasnoyarsk Kray; Krasnoyarskii Krai)
        • Evenkia (Evenkiyskiy Autonomous okrug)
          • Nizhnyaya Tunguska River Basin (Lower Tunguska River)
    		No reference listed
    UK
     
    • Northern Ireland
      • Co. Antrim
        • Larne
    		Mineralogical Magazine 1942 26 : 190-196
    • Scotland
      • North West Highlands (Argyllshire)
        • Ardnamurchan
    		Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Mineralogical Magazine 1965 34 : 1-15.
      • North West Highlands (Inverness-shire)
        • Isle of Muck
    		Tilley, C.E. (1947) The gabbro-limestone contact zone of Camas Mor, Muck, Inverness-shire. Comptes Rendus de la Société geologique de Finlande, No. 140, 97–105.
      • Strathclyde (Argyllshire)
        • Isle of Mull
    		Mineralogical Magazine 1965 34 : 92-106.
    USA
     
    • Texas
      • Brewster Co.
        • Christmas Mts
    		Rocks & Minerals (1991): 66:3: 196-224.
      • Culberson Co.
        • Apache Peak area
    		Rocks & Minerals: 66(3): 196-224.; Am Min 51:1766-1774
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 23rd Oct 2009 13:35:30