72.1.1.1

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
1 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings

Hey's CIM Ref.:

14.16.16

14 : Silicates not Containing Aluminum
16 : Silicates of U

Pronounciation of EkaniteHide

Pronounciation:

Play	Recorded by	Country
	Jolyon & Katya Ralph	United Kingdom

Physical Properties of EkaniteHide

Lustre:

Vitreous

Colour:

Green in various shades, straw-yellow, dark red, colorles

Streak:

White

Hardness:

4½ on Mohs scale

Tenacity:

Brittle

Cleavage:

Distinct/Good
Distinct on {101}, indistinct on {001}

Fracture:

Irregular/Uneven

Density:

2.95 - 3.28 g/cm³ (Measured) 3.36 g/cm³ (Calculated)

Optical Data of EkaniteHide

Type:

Uniaxial (-)

RI values:

n_ω = 1.580 n_ε = 1.568

Max Birefringence:

δ = 0.012

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Surface Relief:

Low

Chemical Properties of EkaniteHide

Formula:

Ca₂ThSi₈O₂₀

Elements listed:

Ca, O, Si, Th - search for minerals with similar chemistry

Common Impurities:

U,Fe,Pb,Al,Mn,Pb,Mg

Crystallography of EkaniteHide

Crystal System:

Tetragonal

Class (H-M):

4 2 2 - Trapezohedral

Space Group:

I4 2 2

Cell Parameters:

a = 7.483(3) Å, c = 14.893(6) Å

Ratio:

a:c = 1 : 1.99

Unit Cell V:

833.94 Å³ (Calculated from Unit Cell)

Comment:

Very often metamict.

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
7.45	(58)
6.70	(61)
4.14	(100)
3.343	(96)
3.265	(65)
2.642	(54)
1.796	(26)

Comments:

Very often metamict.

Type Occurrence of EkaniteHide

Type Locality:

ⓘ Ehiliyagoda (Ehaliyagoda; Ehelliyagoda), Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka

Place of Conservation of Type Material:

Canadian Geological Survey, Ottawa, Canada, 62722.
The Natural History Museum, London, England, 1961, 472.
National Museum of Natural History, Washington, D.C., USA, 148771.

Reference:

Anderson, B.W., Claringbull, G.F., Davis, R.J., Hill, D.K. (1961) Ekanite, a new metamict mineral from Ceylon. Nature: 190: 997.

Other Language Names for EkaniteHide

German:Ekanit

Russian:Эканит

Simplified Chinese:硅钙铀钍矿

Spanish:Ekanita

Traditional Chinese:矽鈣鈾釷礦

Common AssociatesHide

Associated Minerals Based on Photo Data:

Diopside	1 photo of Ekanite associated with Diopside on mindat.org.
Wollastonite	1 photo of Ekanite associated with Wollastonite on mindat.org.

Related Minerals - Nickel-Strunz Grouping Hide

9.EA.05	Cuprorivaite	CaCuSi₄O₁₀	Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.05	Gillespite	BaFe²⁺Si₄O₁₀	Tet.
9.EA.05	Effenbergerite	BaCuSi₄O₁₀	Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.05	Wesselsite	SrCuSi₄O₁₀	Tet.
9.EA.15	Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O	Tet. 4/mmm (4/m 2/m 2/m) : P4/mnc
9.EA.15	Hydroxyapophyllite-(K)	KCa₄(Si₈O₂₀)(OH,F) · 8H₂O	Tet.
9.EA.15	Fluorapophyllite-(Na)	NaCa₄(Si₈O₂₀)F · 8H₂O	Orth.
9.EA.20	Magadiite	Na₂Si₁₄O₂₉ · 11H₂O	Mon.
9.EA.25	Dalyite	K₂ZrSi₆O₁₅	Tric.
9.EA.25	Davanite	K₂TiSi₆O₁₅	Tric.
9.EA.30	Sazhinite-(Ce)	Na₂CeSi₆O₁₄•6H₂O
9.EA.30	Sazhinite-(La)	Na₃La[Si₆O₁₅] · 2H₂O	Orth. mm2 : Pmm2
9.EA.35	Armstrongite	CaZr[Si₆O₁₅] · 3H₂O	Mon.
9.EA.40	Okenite	Ca₁₀Si₁₈O₄₆ · 18H₂O	Tric. 1 : P1
9.EA.45	Nekoite	Ca₃Si₆O₁₅·7H₂O	Tric. 1 : P1
9.EA.50	Cavansite	Ca(VO)Si₄O₁₀ · 4H₂O	Orth. mmm (2/m 2/m 2/m)
9.EA.55	Pentagonite	Ca(VO)Si₄O₁₀ · 4H₂O	Orth. mm2
9.EA.60	Penkvilksite	Na₄Ti₂Si₈O₂₂ · 4H₂O	Orth. mmm (2/m 2/m 2/m) : Pbcn
9.EA.60	Tumchaite	Na₂Zr(Si₄O₁₁) · 2H₂O	Mon.
9.EA.65	Nabesite	Na₂BeSi₄O₁₀ · 4H₂O	Orth. 2 2 2 : P2₁ 2₁ 2₁
9.EA.70	Ajoite	(K,Na)Cu₇AlSi₉O₂₄(OH)₆ · 3H₂O	Tric.
9.EA.75	Zeravshanite	Na₂Cs₄Zr₃[Si₁₈O₄₅]*2H₂O	Mon. 2/m : B2/b
9.EA.80	Bussyite-(Ce)	(Ce,REE)₃(Na,H₂O)₆MnSi₉Be₅(O,OH)₃₀F₄	Mon. 2/m : B2/b
9.EA.85	Plumbophyllite	Pb₂Si₄O₁₀ · H₂O	Orth. mmm (2/m 2/m 2/m) : Pbcn

Related Minerals - Hey's Chemical Index of Minerals Grouping Hide

14.16.1	Uranosilite	UO₃ · 7SiO₂	Orth.
14.16.2	Coffinite	(U⁴⁺,Th)(SiO₄)_1-x(OH)_4x	Tet.
14.16.3	Soddyite	(UO₂)₂SiO₄ · 2H₂O	Orth.
14.16.4	Swamboite-(Nd)	Nd_0.333[(UO₂)(SiO₃OH)](H₂O)_∼2.5	Mon.
14.16.5	Weeksite	K₂(UO₂)₂(Si₅O₁₃) · 4H₂O	Orth.
14.16.6	Boltwoodite	(K,Na)(UO₂)(SiO₃OH) · 1.5H₂O	Mon. 2 : P2₁
14.16.7	Natroboltwoodite	Na(UO₂)(SiO₃OH) · H₂O
14.16.8	Cuprosklodowskite	Cu(UO₂)₂(SiO₃OH]₂ · 6H₂O	Tric. 1 : P1
14.16.9	Sklodowskite	Mg(UO₂)₂(SiO₃OH)₂ · 6H₂O	Mon. 2/m : B2/m
14.16.10	Uranophane	Ca(UO₂)₂(SiO₃OH)₂ · 5H₂O	Mon. 2 : P2₁
14.16.11	Uranophane-β	Ca(UO₂)₂(SiO₃OH)₂ · 5H₂O	Mon.
14.16.12	Haiweeite	Ca(UO₂)₂[Si₅O₁₂(OH)₂] · 6H₂O	Mon.
14.16.13	Metahaiweeite	Ca(UO₂)₂Si₆O₁₅ · nH₂O
14.16.15	Steacyite	K_0.3(Na,Ca)₂ThSi₈O₂₀	Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc
14.16.17	Kasolite	Pb(UO₂)[SiO₄] · H₂O	Mon. 2/m : P2₁/b
14.16.18	Orlite	Pb₃(UO₂)₃(Si₂O₇)₂ · 6H₂O
14.16.19	Oursinite	Co(UO₂)₂(SiO₃OH)₂ · 6H₂O	Orth. mmm (2/m 2/m 2/m) : Cmca

Other InformationHide

Notes:

Radioactive

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 EkaniteHide

Reference List:

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)

Anderson, B.W., Claringbull, G.F., Davis, R.J., Hill, D.K. (1961) Ekanite, a new metamict mineral from Ceylon. Nature: 190: 997.

Fleischer, M. (1961) New mineral names. American Mineralogist: 46: 1513-1520.

Gübelin, E.J. (1962) Ekanite. The Gemmologist: 31(373): 142-152.

Gübelin, E.J. (1962) Ekanite. The Gemmologist: 31(374): 165-169.

International Mineralogical Association (1967) Commission on new minerals and mineral names. Mineralogical Magazine: 36: 131-136.

Chromy, B. (1973) The wee crystals. Earth Science: 1973: 227-278. [see http://www.mindat.org/mesg-6-367561.html]

Perrault, G., Richard, P. (1973) L'ekanite de Saint-Hilaire, P.Q.. The Canadian Mineralogist: 11: 913-929.

Szymański, J.T., Owens, D.R., Roberts, A.C., Ansell, H.G., Chao, G.Y. (1982) A mineralogical study and crystal structure determination of nonmetamict ekanite ThCa2Si8O20. Canadian Mineralogist: 20: 65 75.

Perrault, G., Szymański, J.T. (1982) Steacyite, a new name and a re evaluation of the nomenclature of "ekanite" group minerals. Canadian Mineralogist: 20: 59-63.

Dunn, P.J., Fleischer, M., Burns, R.G., Pabst, A. (1983) New mineral names. American Mineralogist: 68: 471-475.

Della Ventura, G., Maras, A., Parodi, G.C. (1986) Nonmetamict U-rich ekanite from Pitigliano (Tuscany, Italy). Atti della Accademia Nazionale dei Lincei, Rendiconti, Classe di Scienze Fisiche, Matematiche e Naturali: 80: 585-592.

Evans, R.J., Groat, L.A. (2012) Structure and topology of dumortierite and dumortierite-like materials. The Canadian Mineralogist: 50: 1197-1231.

Internet Links for EkaniteHide

mindat.org URL:

https://www.mindat.org/min-1361.html
Please feel free to link to this page.

Search Engines:

Look for Ekanite on Google

Look for Ekanite images on Google

External Links:

Look for Ekanite on Webmineral

Look for Ekanite on Wikipedia

Look for Ekanite on Mineralien Atlas

Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

Mineral Dealers:

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Ekanite specimens for sale - minfind.com

Minerals from Australia and beyond - RocknCrystals

Specimens:

The following Ekanite specimens are currently listed for sale on minfind.com.

Localities for EkaniteHide

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.


Canada
Québec Abitibi-Témiscamingue Témiscamingue RCM Les Lacs-du-Témiscamingue ⓘ Kipawa alkaline complex ?	GSC database: XRD only; metamict
Montérégie La Vallée-du-Richelieu RCM Mont Saint-Hilaire ⓘ ~~Poudrette quarry (Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH)~~	Richard A.J. (1971), La methode d'addition symbolique et la definition de la structure cristalline de l'ekanite de St-Hilaire, P.Q. Ph.D. Thesis, Ecole polytechnique de Montréal, Canada; Perrault G. and Richard P. (1973), L'ekanite de St-Hilaire, P.Q. Canadian Mineralogist: 11: 913-929.
Yukon Dawson Mining District ⓘ Tombstone Mts	SZYMAŃSKI, J.T., OWENS, D.R., ROBERTS, A.C., ANSELL, H.G. & CHAO, G.Y. (1982): A mineralogical study and crystal structure determination of nonmetamict ekanite ThCa2Si8O20. Canadian Mineralogist 20, 65-75. PERRAULT, G. & SZYMAŃSKI, J.T. (1982): Steacyite, a new name and a re evaluation of the nomenclature of "ekanite" group minerals. Canadian Mineralogist 20, 59 63.
ⓘ North Cirque	SZYMAŃSKI, J.T., OWENS, D.R., ROBERTS, A.C., ANSELL, H.G. & CHAO, G.Y. (1982): A mineralogical study and crystal structure determination of nonmetamict ekanite ThCa2Si8O20. Canadian Mineralogist 20, 65 75.

Germany
Baden-Württemberg Black Forest Waldshut Detzeln ⓘ Porphyry quarry	Hess, E., Graeser, S. & Gabriel, W. (2011): Das Porphyrwerk Detzeln im Steinatal und seine Mineralien. Lapis 36 (4), 25-35; 54.

Italy
Campania Naples Province Somma-Vesuvius Complex Monte Somma Ercolano San Vito ⓘ San Vito quarry	Russo, M., Campostrini, I., Demartin, F. (2013). Nuove specie minerali al Monte Somma: V. L'ekanite. Micro, 3/2013, 142-144
Latium Rome Province ⓘ Alban Hills	Caponera, I., Fiori, S., Pucci, R., & Signoretti, E. (2007). I minerali dei Colli Albani. Un aggiornamento sugli ultimi dieci anni di ricerche. Rivista Mineralogica Italiana, 31 (2), 74-91.
Albano Laziale ⓘ Albano Lake crater	Gianfagna, A., Merlino, S., Perchiazzi, N. (1988). Guarinite, a new finding in the sanidinite ejecta of the IV Hydromagmatic Unit from Albano lake crater, Latium, Italy. Periodico di Mineralogia, 57: 81-84.
Rome ⓘ Stracciacappe caldera	Gresta, S., Duronio, F., Mancinella D. (2002): Geositi e Sistema delle Aree Protette del Lazio: idee per la geoconservazione. Il Cercapietre. Not. del Gruppo Mineralogico Romano, 1-2: 48-55
Viterbo Province Vico Lake ⓘ Vetralla	No reference listed
Lombardy Sondrio Province Valtellina ⓘ Malenco Valley	Lapis, 19 (10), 15-21+86.
Tuscany Grosseto Province Pitigliano ⓘ Case Collina (Toscopomici quarry)	Liotti L., 1991. I minerali dei vulcani laziali a Pitigliano (Grosseto). Riv. Mineral. Ital., 15: 121-139.
Livorno Province Campigliese (Campiglia Mountains; Campiglia Ridge) Campiglia Marittima ⓘ Botro ai Marmi	Biagioni, C. (2016) Ekanite. Nuovi ritrovamenti a Botro ai Marmi, Campiglia Marittima (LI). Rivista Mineralogica Italiana, 40, 242-245.

Myanmar
Mandalay Region (Mandalay Division) Pyin-Oo-Lwin District Mogok Township Mogok Valley ⓘ Oak-saung-taung (Oh Saung Taung; Phayar-taung)	Pavel M. Kartashov analytical data, Sieghard Ellenberger specimens

Portugal
Azores District São Miguel Island Água de Pau Massif ⓘ Água de Pau Volcano (Fogo Volcano)	Samples collected by Luigi Chiappino and analysed by Dr. Anthony Kampf, Natural History Museum of Los Angeles County, USA

Sri Lanka
Sabaragamuwa Province Ratnapura District ⓘ Rakwana	Dissanayake, C. B., Chandrajith, R. O. H. A. N. A., & Tobschall, H. J. (2000). The geology, mineralogy and rare element geochemistry of the gem deposits of Sri Lanka. BULLETIN-GEOLOGICAL SOCIETY OF FINLAND, 72(1/2), 5-20.
Ratnapura ⓘ Ehiliyagoda (Ehaliyagoda; Ehelliyagoda) (TL)	Nature 190 (1961), 997
Uva Province Moneragala District ⓘ Okkampitiya	Dr. Jaroslav Hyrsl specimens; Mathavan, V., Kalubandara, S. T., & Fernando, G. W. A. R. (2000). Occurrences of two new types of gem deposits in Okkampitiya gem field in Sri Lanka.

USA
California Tulare Co. Dumtah ⓘ Baumann prospect (Bauman Ranch)	Mineralogical Record: 34(2): 159-166

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Ekanite

Classification of EkaniteHide