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Rankinite

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Formula:
Ca3Si2O7
Colour:
Colourless
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.96 - 3.00
Crystal System:
Monoclinic
Name:
Named after George Atwater Rankin (1884-1963), physical chemist at the Geophysical Laboratory.
This page provides mineralogical data about Rankinite.


Hide all sections | Show all sections

Classification of RankiniteHide

Approved, 'Grandfathered' (first described prior to 1959)
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

Physical Properties of RankiniteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless
Hardness:
5½ on Mohs scale
Cleavage:
Perfect
(100)
Density:
2.96 - 3.00 g/cm3 (Measured)    3.00 g/cm3 (Calculated)

Optical Data of RankiniteHide

Type:
Biaxial (+)
RI values:
nα = 1.640 - 1.643 nβ = 1.643 - 1.646 nγ = 1.650 - 1.652
2V:
Measured: 62° to 69°, 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 r > v

Chemical Properties of RankiniteHide

Formula:
Ca3Si2O7

Crystallography of RankiniteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/a
Cell Parameters:
a = 10.557(1) Å, b = 8.885(3) Å, c = 7.858(1) Å
β = 119.586(6)°
Ratio:
a:b:c = 1.188 : 1 : 0.884
Unit Cell V:
640.97 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Rarely as prismatic crystals, to 8 mm

Type Occurrence of RankiniteHide

General Appearance of Type Material:
rounded or irregular grains.
Place of Conservation of Type Material:
The Natural History Museum, London, England, 1956,386.
Geological Setting of Type Material:
High temperature metamorphism at contact between limestone and flint.
Associated Minerals at Type Locality:

Other Language Names for RankiniteHide

German:Rankinit
Spanish:Rankinita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Wollastonite3 photos of Rankinite associated with Wollastonite on mindat.org.
Andradite-Schorlomite Series3 photos of Rankinite associated with Andradite-Schorlomite Series on mindat.org.
Gehlenite3 photos of Rankinite associated with Gehlenite on mindat.org.
Leucite1 photo of Rankinite associated with Leucite on mindat.org.
Spurrite1 photo of Rankinite associated with Spurrite on mindat.org.
Aradite1 photo of Rankinite associated with Aradite on mindat.org.
Melilite Group1 photo of Rankinite associated with Melilite Group on mindat.org.
Wollastonite Group1 photo of Rankinite associated with Wollastonite Group on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.BC.05GittinsiteCaZrSi2O7Mon.
9.BC.05Keiviite-(Y)Y2Si2O7
9.BC.05Keiviite-(Yb)Yb2Si2O7Mon. 2/m : B2/m
9.BC.05ThortveititeSc2Si2O7Mon.
9.BC.05Yttrialite-(Y)(Y,Th)2Si2O7
9.BC.10Keldyshite(Na,H)2ZrSi2O7Tric. 1 : P1
9.BC.10KhibinskiteK2ZrSi2O7Mon.
9.BC.10ParakeldyshiteNa2ZrSi2O7Tric.
9.BC.20BarysilitePb8Mn2+[Si2O7]3Trig.
9.BC.25Edgarbaileyite(Hg-Hg)3Si2O7Mon.
9.BC.30KristianseniteCa2ScSn(Si2O7)(Si2O6OH)Tric. 1
9.BC.35Percleveite-(Ce)(Ce,La,Nd)2Si2O7Tet. 4

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.5.1WollastoniteCaSiO3Tric. 1 : P1
14.5.2Wollastonite-7TCaSiO3
14.5.3Wollastonite-2MCaSiO3Mon.
14.5.5KilchoaniteCa6(SiO4)(Si3O10)Orth.
14.5.6LarniteCa2SiO4Mon.
14.5.7BredigiteCa7Mg(SiO4)4Orth.
14.5.8HatruriteCa3(SiO4)OTrig.
14.5.9RosenhahniteHCa3[Si3O9(OH)]Tric.
14.5.10DellaiteCa6Si3O11(OH)2Tric.
14.5.11AfwilliteCa3(HSiO4)2 · 2H2OMon. m : Bb
14.5.12XonotliteCa6(Si6O17)(OH)2Mon. 2/m
14.5.13FoshagiteCa4(Si3O9)(OH)2Tric.
14.5.14HillebranditeCa2(SiO3)(OH)2Orth. mmm (2/m 2/m 2/m) : Cmcm
14.5.15JaffeiteCa6(Si2O7)(OH)6Trig. 3 : P3
14.5.16SuoluniteCa2(H2Si2O7) · H2OOrth.
14.5.17KillalaiteCa6.4(H0.6Si2O7)2(OH)2Mon.
14.5.18OkeniteCa10Si18O46 · 18H2OTric. 1 : P1
14.5.19RiversideiteCa5(HSi3O9)2 · 2H2OOrth.
14.5.20TrabzoniteCa4(Si3O9)(OH)2Orth. mm2 : Ama2
14.5.21GyroliteNaCa16Si23AlO60(OH)8 · 14H2OTric.
14.5.22FoshallasiteCa3[Si2O7] · 3H2O(?)
14.5.23Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)Orth.
14.5.24Clinotobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)Mon.
14.5.25NekoiteCa3Si6O15·7H2OTric. 1 : P1
14.5.26Plombièrite[Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O)Orth.
14.5.27JenniteCa9(Si3O9)2(OH)8 · 8H2OTric.

Other InformationHide

Notes:
It gelatinizes readily in weak HCl-H2SO4 solutions, precipitating abundant gypsum
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 RankiniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
C. E. Tilley Tricalcium Disilicate (Rankinite), a New Mineral from Scawt Hill, Co. Antrim Mineralogical Magazine 1942 26 : 190-196
Fleischer M (1942) New mineral names, American Mineralogist, 27, 720-720
Kusachi I, Henmi C, Kawahara A, Henmi K (1975) The structure of rankinite, Mineralogical Journal, 8, 38-47
Saburi S, Kusachi I, Henmi C, Kawahara A, Henmi K, Kawada I (1976) Refinement of the structure of rankinite, Mineralogical Journal, 8, 240-246
Physics and Chemistry of Minerals (1987): 14: 542.

Internet Links for RankiniteHide

Localities for RankiniteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
France
 
  • Occitanie
    • 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]
in the collection of Christof Schäfer
Galuskin, E.V., Krüger, B., Krüger, H., Blass, G., Widmer, R., Galuskina, I.O. (2016): Wernerkrauseite, CaFe3+2Mn4+O6 - the first non-stoichiometric post-spinel mineral, from Bellerberg volcano, Eifel, Germany. European Journal of Mineralogy, 28, 485-493
Israel
 
  • Negev
Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
      • Hatrurim (Hatrurim Basin)
Sokol, E.V., Seryotkin, Y.V., Kokh, S.N., Vapnik, Ye., Nigmatulina, E.N., Goryainov, S.V., Belogub, E.V., Sharygin, V.V. (2015): Flamite, (Ca,Na,K)2(Si,P)O4, a new mineral from ultrahigh-temperature combustion metamorphic rocks, Hatrurim Basin, Negev Desert, Israel. Mineralogical Magazine, 79, 583-596.
  • Southern District (HaDarom District)
Galuskin, E.V., Galuskina, I.O., Gfeller, F., Krüger, B., Kusz, J., Vapnik, Y., Dulski, M., Dzierżanowski, P. (2016): Silicocarnotite, Ca5[(SiO4)(PO4)](PO4), a new ‘old’ mineral from the Negev Desert, Israel, and the ternesite-silicocarnotite solid solution: indicators of high-temperature alteration of pyrometamorphic rocks of the Hatrurim Complex, Southern Levant. European Journal of Mineralogy: 28: 105-12.
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.; Cámara, F., Nestola, F., Bindi, L., Guastoni, A., Zorzi, F., Peruzzo, L., & Pedron, D. (2012). Tazzoliite: a new mineral with a pyrochlore-related structure from the Euganei Hills, Padova, Italy. Mineralogical Magazine, 76(4), 827-838.
Japan
 
  • Honshu Island
    • Chugoku Region
      • Okayama Prefecture
        • Takahashi City
          • Bicchu-cho (Bitchu-cho)
            • Fuka
Henmi, C., Kusachi, I., Henmi, K., Sabine, P.A., Young, B.R. (1973) A new mineral bicchulite, the natural analogue of gehlenite hydrate, from Fuka, Okayama Prefecture, Japan and Carneal, County Antrim, Northern Ireland. Mineralogical Journal: 7: 243-251.; Mineralogical Journal (1975) Vol. 8, N° 1, pp. 38-47;
Jordan
 
  • Irbid
    • Maqarin area
Pitty, A. F., & Alexander, W. R. (2010). A natural analogue study of cement buffered, hyperalkaline groundwaters and their interaction with a repository host rock IV: an examination of the Khushaym Matruk (central Jordan) and Maqarin (northern Jordan) sites. NDA-RWMD Technical Report, NDA, Moors Row, UK.
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
 
  • 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.
  • Hunedoara Co.
    • Brad
The Canadian Mineralogist Vol. 39, pp. 1405-1434 (2001)
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 (TL)
 
  • Northern Ireland
    • Co. Antrim
      • Larne
Mineralogical Magazine 1942 26 : 190-196
  • Scotland
    • North West Highlands
      • Ardnamurchan
American Mineralogist 35:1080
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Agrell, S.O. and Gay, P. (1961) Kilchoanite, a Polymorph of Rankinite. Nature, 189, 743; Agrell, S.O. (1965) Polythermal Metamorphism of Limestones at Kilchoan, Ardnamurchan. Mineralogical Magazine, vol. 34, n° 268, 1-15.; Embrey, P.G. (1978) Fourth supplementary list of British minerals. Mineralogical Magazine, vol. 42, n° 322, 169-177 (referring to Agrell);
      • 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
      • Isle of Mull
Cann, J.R. (1965) The metamorphism of amygdales at 'S Airde Beinn, Northern Mull. Mineralogical Magazine, vol. 34, n° 268, 92-106.; http://jncc.defra.gov.uk/pdf/gcrdb/GCRsiteaccount21.pdf
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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