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Rankinite

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Formula:
Ca3Si2O7
System:
Monoclinic
Colour:
Colourless
Hardness:
Name:
Named after George Atwater Rankin, physical chemist at the Geophysical Laboratory.
This page provides mineralogical data about Rankinite.

Classification of Rankinite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.BC.15

9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
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
14.5.4

14 : Silicates not Containing Aluminum
5 : Silicates of Ca
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First Recorded Occurrence of Rankinite

Year of Discovery:
1942

Physical Properties of Rankinite

Colour:
Colourless
Hardness (Mohs):

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°
Max Birefringence:
δ = 0.010
Image 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:
Ca3Si2O7
Essential elements:
All elements listed in formula:

Relationship of Rankinite to other Species

9.BC.05GittinsiteCaZrSi2O7
9.BC.05Keiviite-(Y)(Y,Yb)2[Si2O7]
9.BC.05Keiviite-(Yb)(Yb,Y)2Si2O7
9.BC.05Thortveitite(Sc,Y)2Si2O7
9.BC.05Yttrialite-(Y)(Y,Th)2Si2O7
9.BC.10Keldyshite(Na,H)2ZrSi2O7
9.BC.10KhibinskiteK2ZrSi2O7
9.BC.10ParakeldyshiteNa2ZrSi2O7
9.BC.20BarysilitePb8Mn2+[Si2O7]3
9.BC.25Edgarbaileyite(Hg-Hg)3Si2O7
9.BC.30KristianseniteCa2ScSn(Si2O7)(Si2O6OH)
9.BC.35Percleveite-(Ce)(Ce,La,Nd)2Si2O7
14.5.1WollastoniteCaSiO3
14.5.2Wollastonite-7T
14.5.3Wollastonite-2MCaSiO3
14.5.5KilchoaniteCa6(SiO4)(Si3O10)
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
14.5.18OkeniteCaSi2O5 · 2H2O
14.5.19RiversideiteCa5(HSi3O9)2 · 2H2O
14.5.20TrabzoniteCa4(Si3O10) · 2H2O
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 Rankinite

Name in Other Languages:
German:Rankinit
Spanish:Rankinita

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 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

Localities for Rankinite

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.
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
      • Mayen
        • Ettringen
          • Bellerberg volcano
[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
Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
Italy
 
  • Umbria
    • Perugia Province
      • Spoleto
Stoppa F., Sharygin V.V., 2009. Melilitolite intrusion and pelite digestion by high temperature kamafugitic magma at Colle Fabbri, Spoleto, Italy. Lithos, 112, 306-320.
  • 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
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.
Palestine
 
  • West Bank
    • Hatrurim Formation
Seryotkin Y.V., Sokol E.V. & Kokh S.N. 2012: Natural pseudowollastonite: Crystal structure, associated minerals, and geological context. Lithos, vol. 134-135, pp. 75-90; Seryotkin, Yu.V., Sokol, E.V., Kokh, S.N. (2012): Natural pseudowollastonite: Crystal structure, associated minerals, and geological context. Lithos, 134–135, 75-90.
Romania
 
  • Alba Co.
    • Apuseni District
The Canadian Mineralogist Vol. 39, pp. 1405-1434 (2001)
  • 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
    • Krasnoyarsk Territory (Krasnoyarsk Kray; Krasnoyarskii Krai)
      • Evenkia (Evenkiyskiy Autonomous okrug)
        • Nizhnyaya Tunguska River Basin (Lower Tunguska River)
Reverdatto, V. V., Pertsev, N. N., & Korolyuk, V. N. (1979). P_ {CO_2}-T-Evolution and origin of zoning in melilite during the regressive stage of contact metamorphism in carbonate-bearing rocks. Contributions to Mineralogy and Petrology, 70(2), 203-208
UK
 
  • Northern Ireland
    • Co. Antrim
      • Larne
Mineralogical Magazine 1942 26 : 190-196
  • Scotland
    • North West Highlands (Argyllshire)
      • Ardnamurchan
American Mineralogist 35:1080
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
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