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Posted by Branko Rieck  
Branko Rieck November 02, 2010 09:02AM
IMA 2009-041 = ellingsenite

see also

I posted this in the Scrapbook and not in IMA status, because I could not find an "official" reference yet (Admins feel free to move this thread!).

I don't know about the policy of Mindat regarding the publication of new mineral names, but the lid seems to be off, because at the Munich show this mineral was offered by at least 3 different dealers under its name and not only its IMA number.

Victor N. Yakovenchuk is noted in the IMA list as author. Maybe somebody could get a comment from him.

Marco E. Ciriotti November 02, 2010 03:40PM
Also in some other web sites (i.e.:
Jolyon & Katya Ralph November 02, 2010 03:58PM
Updated on mindat.

Hans Kloster November 03, 2010 07:34AM
Ellingsenite is named after the 80 year old amateurgeologist, Hans Vidar Ellingsen, Oslo and the first member of Stenvennerne - Københavns Amatørgeologiske Forening with a mineral named after. We are very proud of Hans Vidar and his wife Astrid.
David Von Bargen November 04, 2010 05:56PM
If you have any photos of him, we could use his picture on the mineral page for the "photo of whom the mineral was named for".
Hans Kloster November 05, 2010 08:18AM
I have a photo with Hans Vidar Ellingsen, but I can not make a copy here - I can send it to an E-mail address
I have
Hans Kloster November 05, 2010 08:21AM
The photo is attached
open | download - Hans Vidar.JPG (167.7 KB)
Uwe Kolitsch November 05, 2010 08:44AM
Thanks, photo uploaded (, but I can't link it to the mineral page at the moment (bug).
Uwe Kolitsch November 05, 2010 11:14AM
Now it's here (it was no bug, but there has to be some text in the field explaining the name and its history).
Uwe Kolitsch February 09, 2011 10:15PM
Ellingsenite, Na5Ca6Si18O38(OH)13•6H2O, a new gyrolite related mineral from
phonolite of the Aris alkaline complex (Namibia)
Marco E. Ciriotti January 06, 2012 11:22AM
• Yakovenchuk, V.N., Ivaniuk, G.Yu., Pakhomovsky, Ya.A., Selivanova, E.A., Korchak, J.A., Zalkind, O.A., Krivovichev, S.V., Zolotarev, A.A. (2011): Ellingsenite, Na5Ca6Si18O38(OH)13·6H2O, a new gyrolite related mineral from phonolite of the Aris alkaline complex (Namibia). Canadian Mineralogist, 49, 1165-1173.

Ellingsenite, Na5Ca6Si18O38(OH)13·6H2O, is a new calcium silicate hydrate (CSH) P-1, a 9.55(3), b 9.395(8), c 16.329(3) Å, α 100.2(1), β 94.9(2), γ 117.8(2)°, V 1251(8) Å3, Z = 1 (from powder-diffraction data) or a 9.576(11), b 9.577(11), c 16.438(19) Å, α 85.85(2), β 75.23(2), γ 60.142(14)°, V 1262(3) Å3, Z = 1 (from single-crystal diffraction data)>, chemically and structurally related to minerals of the gyrolite–reyerite group. The mineral is found in a hydrothermally altered phonolite of the Aris alkaline complex, in Namibia, as snow-white spherules (up to 3 mm in diameter) of well-shaped rhomb-like crystals associated with aegirine, albite, manganoneptunite, microcline, natrolite and polylithionite. The mineral is transparent, colorless in separate crystals, white in aggregates, with a vitreous (separate crystals) to silky (aggregates) luster and a white streak. Cleavage is perfect on {001}, and the fracture is smooth. The Mohs hardness is 4. In transmitted light, the mineral is colorless; dispersion is not observed. Ellingsenite is biaxial (–): α 1.520(2), β 1.534(2), γ 1.536 (589 nm), 2Vmeas 5°. Optical orientation: X = c. Dcalc = 2.38 g cm−3, Dmeas = 2.32(5) g cm−3. The mean chemical composition determined by electron microprobe is: Na2O 9.26, K2O 0.23, CaO 17.35, SiO2 60.35, H2O 12.5 (Penfield method), for a total of 99.69 wt.%. The empirical formula calculated on the basis of 57 atoms of oxygen is (Na4.95K0.09)∑5.04(Ca5.57Na0.43)∑6.00Si18.10O38(OH)13·6H2O. The simplified formula is Na5Ca6Si18O38(OH)13·6H2O. The mineral does not effervesce in 1:1 HCl at room temperature. The strongest X-ray powder-diffraction lines <d in Å(I)hkl> are: 15.50(100)001, 4.22(16)2-01, 3.159(30)005, 3.023(33)32-1, 2.791(24)2-1-4, and 1.827(27)5-11. The crystal-structure model of ellingsenite (R1 = 0.247) obtained from a crystal of poor quality displays layers of octahedra and tetrahedra of the T2OT-2 type with the composition {Na1.90Ca5.10X2}, where X = O, OH, with the interlayer content unresolved. Ellingsenite can be considered as a derivative of martinite, obtained from the latter by intercalation of some additional species (most probably, Na hydrosilicate) in between the adjacent layers of octahedra and tetrahedra. The principal absorption bands in the infrared spectrum include 3460, 1600, 1360 and 1025 cm−1 (shoulder at 1140 cm−1) plus four bands in the region of 780–380 cm−1. The mineral is named in honor of Dr. Hans Vidar Ellingsen (born 1930), a well-known Norwegian mineral collector, who found this mineral during his expedition to the Aris complex.
Uwe Kolitsch January 09, 2012 01:02PM
The R-value of the crystal-structure determination (24.7%) explains why it took so long to get this mineral approved.
Although ellingsenite crystals generally look fine, they invariably show a horrible crystal quality ...
Geir February 23, 2012 08:35PM
I am his brother and I have pictures of Hans Vidar Ellingsen.
Patrick Haynes (2) March 24, 2012 09:14PM
I have been perusing several flats of Aris material collected by David Shannon in 1995. Using Mindat images as a guide am I correct in assuming that ellingsenite is common? I am finding lots of late white, silky-lustered tiny xls, which I assume are ellingsenite. Sometimes they are sprinkled on/amongst tuppersuatsiaite xls. Suggestions?
Antonio Borrelli March 24, 2012 11:01PM
Reducing material from Aris I found ellingsenite to be quite common in the miarolitic cavities and often in pretty associations with greenish tuperssuatsiaite and villiaumite.

Uwe Kolitsch March 26, 2012 05:51PM
Yes, it's quite common, but a bit inconspicuous.
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