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This page provides mineralogical data about Elpidite.
Classification of Elpidite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||8/F.23-10|
|Nickel-Strunz 10th (pending) edition ID:||9.DG.65|
9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
|Dana 8th edition ID:||184.108.40.206|
72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
5 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with corrugated and complex layers
|Hey's CIM Ref.:||14.10.9|
14 : Silicates not Containing Aluminum
10 : Silicates of Zr or Hf
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Type Occurrence of Elpidite
|Type Locality:||Narssârssuk (Narsarsuk), Igaliku (Igaliko), Narsaq, Kitaa (West Greenland) Province, Greenland|
|Year of Discovery:||1894|
Physical Properties of Elpidite
Crystallography of Elpidite
|Cell Parameters:||a = 7.29Å, b = 14.3Å, c = 7.03Å|
|Ratio:||a:b:c = 0.51 : 1 : 0.492|
|Unit Cell Volume:||V 732.86 Å³ (Calculated from Unit Cell)|
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The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. You need Java to see these. You can download Java for free - click here to download Java
The 3d models and java code are kindly provided by www.smorf.nl. You can control the movement of the models by holding down the left mouse-button over the 3d model and moving your mouse. Keyboard controls are:
|X-Ray Powder Diffraction:|
Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Optical Data of Elpidite
|RI values:||nα = 1.560 nβ = 1.565 - 1.569 nγ = 1.574|
|Maximum Birefringence:||δ = 0.014|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r < v moderate|
Chemical Properties of Elpidite
|Essential elements:||H, Na, O, Si, Zr|
|All elements listed in formula:||H, Na, O, Si, Zr|
Relationship of Elpidite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Elpidite
|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 Elpidite
Lindström G (1894) Elpidit, ett nytt mineral från Igaliko, Geologiska Föreningens i Stockholm Förhandlingar, 16, 330-335
American Mineralogist: 58: 106-109.
A. A. Grigor’eva, N. V. Zubkova, I. V. Pekov, U. Kolitsch, D. Yu. Pushcharovsky, M. F. Vigasina, G. Giester, T. Dordević, E. Tillmanns and N. V. Chukanov (2011): Crystal chemistry of elpidite from Khan Bogdo (Mongolia) and its K- and Rb-exchanged forms. Crystallography Reports, 56, 832-841.
Internet Links for Elpidite
|Specimens:||The following Elpidite specimens are currently listed for sale on minfind.com.|
Localities for Elpidite
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.
(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.
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Locality Updated: Peleochora, Crete Department (Kriti), GreeceFrom Debbie Woolf, 22nd May 2013 00:06:10