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Rankinite

Big Photo

Ettringer Bellerberg Mt., 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
 
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 Rankinite

German names:
Rankinit
Russian names:
Ранкинит
Spanish names:
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:American Mineralogist (1942): 27: 720.

Mineralogical Journal: 8: 38-47.

Mineralogical Journal: 8: 240-246.

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

Articles/Blogs about Rankinite

Internet Links for Rankinite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Rankinite details from Handbook of Mineralogy (PDF)
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    Localities for Rankinite

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    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.
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    (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
    		[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
     
    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
      • 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
    		No reference listed
    • 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.
      • Culberson Co.
        • Apache Peak area
    		Rocks & Minerals: 66(3): 196-224.; Am Min 51:1766-1774
    Mineral and/or Locality
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