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Ekanite (Ekanit)

Pictures (8 Images total)

Ekanit
Views (File:
1221490713
): 2923
Ekanit
Bildbreite: 2 mm; Fundort: Poudrette quarry, Mont Saint-Hilaire, Rouville Co., Québec, Kanada
Copyright: Stephan Wolfsried; Contribution: Hg
Location: Kanada/Québec/Montérégie, Region/La Vallée-du-Richelieu RCM/Mont Saint-Hilaire/Poudrette Quarry (Demix Quarry; Uni-Mix Quarry; Desourdy Quarry)
Mineral: Ekanite
Image: 1221490713
Rating: 8 (votes: 3)
License: Usage for Mineralienatlas project only
Ekanit

Bildbreite: 2 mm; Fundort: Poudrette quarry, Mont Saint-Hilaire, Rouville Co., Québec, Kanada
Copyright: Stephan Wolfsried
Contribution: Hg 2008-09-15
Locality: Poudrette Quarry (Demix Quarry; Uni-Mix Quarry; Desourdy Quarry) / Mont Saint-Hilaire / La Vallée-du-Richelieu RCM / Montérégie, Region / Québec / Kanada
Ekanit
Views (File:
1551629328
): 1241
Ekanit
FO: Sri Lanka; Selten großer, facettierter Stein; Größe: 23,06mm x 13,28mm x 6,82mm; Gewicht: 9,12ct
Copyright: etalon; Contribution: etalon
Collection: etalon
Location: Sri Lanka
Mineral: Ekanite
Image: 1551629328
Rating: 8 (votes: 2)
License: Usage for Mineralienatlas project only
Ekanit

FO: Sri Lanka; Selten großer, facettierter Stein; Größe: 23,06mm x 13,28mm x 6,82mm; Gewicht: 9,12ct
Collection: etalon
Copyright: etalon
Contribution: etalon 2019-03-03
Locality: Sri Lanka
Ekanit
Views (File:
1275670660
): 1652, Rating: 4.5
Ekanit
Bildbreite: 2 mm, Fundort: Vetralla, Lago de Vico, Latium, Italien
Copyright: Luigi Chiappino; Contribution: thdun5
Location: Italien/Latium (Lazio), Region/Viterbo, Provinz/Vicosee (Lago di Vico)/Vetralla
Mineral: Ekanite
Image: 1275670660
Rating: 4.5 (votes: 4)
License: Usage for Mineralienatlas project only
Ekanit

Bildbreite: 2 mm, Fundort: Vetralla, Lago de Vico, Latium, Italien
Copyright: Luigi Chiappino
Contribution: thdun5 2010-06-04
Locality: Vetralla / Vicosee (Lago di Vico) / Viterbo, Provinz / Latium (Lazio), Region / Italien
Ekanit
Views (File:
1241331231
): 2300
Ekanit
Bildbreite: 12 mm; Fundort: Ehiliyagoda, Rathnapura, Sri Lanka
Copyright: Pavel M. Kartashov; Contribution: slugslayer
Location: Sri Lanka/Sabaragamuwa, Provinz/Rathnapura (Ratnapura), Distrikt/Rathnapura (Ratnapura)/Ehiliyagoda
Mineral: Ekanite
Image: 1241331231
Rating: 5 (votes: 2)
License: Usage for Mineralienatlas project only
Ekanit

Bildbreite: 12 mm; Fundort: Ehiliyagoda, Rathnapura, Sri Lanka
Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-05-03
Locality: Ehiliyagoda / Rathnapura (Ratnapura) / Rathnapura (Ratnapura), Distrikt / Sabaragamuwa, Provinz / Sri Lanka
Ekanit
Views (File:
1275668817
): 1270
Ekanit
Kristallgröße: 0,1 mm, Fundort: Bassano Romano, Viterbo, Latium, Italien
Copyright: Luigi Mattei; Contribution: thdun5
Location: Italien/Latium (Lazio), Region/Viterbo, Provinz/Bassano di Sutri/Bassano Romano
Mineral: Ekanite
Image: 1275668817
Rating: 4 (votes: 2)
License: Usage for Mineralienatlas project only
Ekanit

Kristallgröße: 0,1 mm, Fundort: Bassano Romano, Viterbo, Latium, Italien
Copyright: Luigi Mattei
Contribution: thdun5 2010-06-04
Locality: Bassano Romano / Bassano di Sutri / Viterbo, Provinz / Latium (Lazio), Region / Italien
Ekanit
Views (File:
1275670697
): 1458
Ekanit
Bildbreite: 2 mm, Fundort: Vetralla, Lago de Vico, Latium, Italien
Copyright: Luigi Chiappino; Contribution: thdun5
Location: Italien/Latium (Lazio), Region/Viterbo, Provinz/Vicosee (Lago di Vico)/Vetralla
Mineral: Ekanite
Image: 1275670697
Rating: 4 (votes: 1)
License: Usage for Mineralienatlas project only
Ekanit

Bildbreite: 2 mm, Fundort: Vetralla, Lago de Vico, Latium, Italien
Copyright: Luigi Chiappino
Contribution: thdun5 2010-06-04
Locality: Vetralla / Vicosee (Lago di Vico) / Viterbo, Provinz / Latium (Lazio), Region / Italien

You find additional Ekanit specimen at the Geolitho Museum

Collectors Summary

Color grün, olivgrün, gelblichgrün, strohgelb, dunkelrot aufgrund von Einschlüssen
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 4.5
Crystal System tetragonal, I422
Morphology schlecht ausgebildete Kristalle bis 1 cm, meist Körner oder zusammengebackene Körner.

Chemism

Chemical formula

ThCa2Si8O20

Chemical composition

Calcium, Silicium, Thorium, Sauerstoff

Unit weight: 856.86775 u; Number of atoms in the formula: 31

Info

Empirical formula:

ThCa2Si8O20

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

37.34

20

64.52

15.9994300

319.9886000
Silicon

Si

26.22

8

25.81

28.0855300

224.6842400
Calcium

Ca

9.35

2

6.45

40.0784000

80.1568000
Thorium

Th

27.08

1

3.23

232.0381100

232.0381100

Analysis wt%

SiO2 : 47.60, CaO : 9.60, ThO2 : 37.80, Al2O3 : 0.80, UO2 : 1.10, FeO : 0.40 (Ref: Canadian Mineralogist 82)

Strunz 9th edition incl. updates

9.EA.10

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
A: Einfache Tetraedernetze mit 4-, 5-, (6-), und 8 beteiligten Ringen
10:Ekanit-Gruppe

Lapis Classification

VIII/E.10-010

VIII: SILIKATE
E: Ringsilikate
10: Doppelte Viererringe [Si8O20] 8-

Classification by Hölzel

9.CB.800

9: SILICATES
C: Cyclosilicates
B: ~[Si4O12]8-, ~[Si4O10]4--Rings
8: Ekanite-Group

Dana 8th edition

72.01.01.01

72: Phyllosilicates Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
01: Phyllosilicates Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

grün, olivgrün, gelblichgrün, strohgelb, dunkelrot aufgrund von Einschlüssen

Streak color

weiß

Diaphaneity (Transparency)

durchscheinend bis transparent, oft schlierig

Lustre

Glasglanz

max. Birefringence

0.001
Birefringence chart\! Ekanite title=Birefringence chart Ekanite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.573

RI value γ / ε

1.572

Ri mean

1.573

2V angle

Uniaxial (-)

Optical Data Luminescence

Color LW-UV (365nm)

  

grün

LW-UV Intensity

stark

Color SW-UV (254nm)

  

grün

SW-UV Intensity

stark

Most Common Activator

(UO2)2+ (Uranyl-Ion) als Verunreinigungen

Afterglow (Persistant Luminescence)

keine Daten

Crystallography

Crystal System

tetragonal

Class (H-M)

422

Space Group number

97

Space Group

I422

Cell parameters a (Å)

7.483

Cell parameters b (Å)

-

Cell parameters c (Å)

14.893

Cell parameters a/b or c/a

1.990

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volumne (ų)

833.938

X-Ray Powder Diffraction

7.45(60),
6.70(60),
4.14(100),
3.343(100),
3.265(60),
2.766(20),
2.642(50),
1.796(30)
XRD chart Ekanite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Morphology

schlecht ausgebildete Kristalle bis 1 cm, meist Körner oder zusammengebackene Körner.

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

4.5

VHN (Hardness Vickers)

280 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.08

3.412 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Sri Lanka/Sabaragamuwa, Provinz/Rathnapura (Ratnapura), Distrikt/Rathnapura (Ratnapura)/Ehiliyagoda

Preface

Occurrences

Detrital (Sri Lanka), glaziale erratische Syenit-Blöcke (Canada), Vulkanische Ejekta (Italien)

Associations

Fluorit, Granat, Quarz, Mikroklin, Clinopyroxen, Apatit, Plagioklas, Hämatit, Thorogummit, Zirkon, Titanit (Tomstone),

Rareness

sehr selten

Author (Name, Year)

Anderson & Claringbull & Davis & Hill, 1961

Relevance, Usage

bisher nur als einer der gesuchtesten Edelsteine

Collector information

Einer der seltensten Edelsteine

Additional Information

Nach dem Entdecker, F.L.D. Ekanayake, Colombo benannt. Die recht hohe Radioaktivität beruht auf dem Th-Gehalt. Aufgrund der Zerstörung des Kristallgitters durch die Alpha-Strahlung wird Ekanit im Laufe der Zeit zersetzt.

Safety Instructions

Industrial chemicals are often present in powder form and therefore often contain much higher dangers than natural, crystalline substances. These hazard statements refer to the classification of industrially used chemical compounds that may also occur in this natural mineral. The hazard classification makes no claim to completeness.




Safety classes: Ionizing radiation: Radioaktiv

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 208

New Minerals and Mineralogy in the 21th Century International Scientific Symposium Jáchymov 2016 - Book of abstracts - New Minerals and Mineralogy 6-7 September 2016

Other languages

German

Ekanit

Spanish

Ekanita

French

Ekanite

English

Ekanite

Russian

Эканит

Traditional Chinese

矽鈣鈾釷礦

Simplified Chinese

硅钙铀钍矿

Japanese

ｴｰｶﾅｲﾄ

CNMNC symbol

Symbol

Ek

Locations with GPS information