IMA 2009-041 = ellingsenite see also [forum.amiminerals.it] 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. Branko http://www.mindat.org/forum.php?read,14,201054,201054#msg-201054 Wed, 22 May 2013 08:55:20 +0000 Phorum 5.2.15a http://www.mindat.org/forum.php?read,14,201054,256374#msg-256374 http://www.mindat.org/forum.php?read,14,201054,256374#msg-256374 Uwe Kolitsch IMA Status Mon, 26 Mar 2012 17:51:43 +0000 http://www.mindat.org/forum.php?read,14,201054,256186#msg-256186 http://www.mindat.org/forum.php?read,14,201054,256186#msg-256186 Antonio Borrelli IMA Status Sat, 24 Mar 2012 23:01:54 +0000 http://www.mindat.org/forum.php?read,14,201054,256177#msg-256177 http://www.mindat.org/forum.php?read,14,201054,256177#msg-256177 Patrick Haynes (2) IMA Status Sat, 24 Mar 2012 21:14:19 +0000 http://www.mindat.org/forum.php?read,14,201054,253238#msg-253238 http://www.mindat.org/forum.php?read,14,201054,253238#msg-253238 Geir IMA Status Thu, 23 Feb 2012 20:35:02 +0000 http://www.mindat.org/forum.php?read,14,201054,248396#msg-248396 http://www.mindat.org/forum.php?read,14,201054,248396#msg-248396 Although ellingsenite crystals generally look fine, they invariably show a horrible crystal quality ...]]> Uwe Kolitsch IMA Status Mon, 09 Jan 2012 13:02:41 +0000 http://www.mindat.org/forum.php?read,14,201054,248035#msg-248035 http://www.mindat.org/forum.php?read,14,201054,248035#msg-248035 • 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.

Abstract:
Ellingsenite, Na5Ca6Si18O38(OH)13·6H2O, is a new calcium silicate hydrate (CSH) [triclinic, 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 [[i]d[/i] 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 {Na1.90Ca5.10[Si8O20]X2}, 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.]]> Marco E. Ciriotti IMA Status Fri, 06 Jan 2012 11:22:05 +0000 http://www.mindat.org/forum.php?read,14,201054,213274#msg-213274 http://www.mindat.org/forum.php?read,14,201054,213274#msg-213274 phonolite of the Aris alkaline complex (Namibia) [MS#4080, 19/11/2010]
V.N. YAKOVENCHUK, G.YU. IVANYUK, YA.A. PAKHOMOVSKY,E.A. SELIVANOVA,
J.A. KORCHAK, O.A. ZALKIND, S.V. KRIVOVICHEV & A.A. ZOLOTAREV

[mineralogicalassociation.ca]]]> Uwe Kolitsch IMA Status Wed, 09 Feb 2011 22:15:22 +0000 http://www.mindat.org/forum.php?read,14,201054,201326#msg-201326 http://www.mindat.org/forum.php?read,14,201054,201326#msg-201326 Uwe Kolitsch IMA Status Fri, 05 Nov 2010 11:14:00 +0000 http://www.mindat.org/forum.php?read,14,201054,201317#msg-201317 http://www.mindat.org/forum.php?read,14,201054,201317#msg-201317 Uwe Kolitsch IMA Status Fri, 05 Nov 2010 08:44:31 +0000 http://www.mindat.org/forum.php?read,14,201054,201316#msg-201316 http://www.mindat.org/forum.php?read,14,201054,201316#msg-201316 Hans Kloster IMA Status Fri, 05 Nov 2010 08:21:49 +0000 http://www.mindat.org/forum.php?read,14,201054,201315#msg-201315 http://www.mindat.org/forum.php?read,14,201054,201315#msg-201315 I have hanskloster@webspeed.dk]]> Hans Kloster IMA Status Fri, 05 Nov 2010 08:18:25 +0000 http://www.mindat.org/forum.php?read,14,201054,201254#msg-201254 http://www.mindat.org/forum.php?read,14,201054,201254#msg-201254 David Von Bargen IMA Status Thu, 04 Nov 2010 17:56:40 +0000 http://www.mindat.org/forum.php?read,14,201054,201122#msg-201122 http://www.mindat.org/forum.php?read,14,201054,201122#msg-201122 Hans Kloster IMA Status Wed, 03 Nov 2010 07:34:16 +0000 http://www.mindat.org/forum.php?read,14,201054,201070#msg-201070 http://www.mindat.org/forum.php?read,14,201054,201070#msg-201070
Jolyon]]> Jolyon & Katya Ralph IMA Status Tue, 02 Nov 2010 15:58:23 +0000 http://www.mindat.org/forum.php?read,14,201054,201068#msg-201068 http://www.mindat.org/forum.php?read,14,201054,201068#msg-201068 www.mineralienatlas.de]).]]> Marco E. Ciriotti IMA Status Tue, 02 Nov 2010 15:40:46 +0000 http://www.mindat.org/forum.php?read,14,201054,201054#msg-201054 http://www.mindat.org/forum.php?read,14,201054,201054#msg-201054
see also [forum.amiminerals.it]

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.

Branko]]> Branko Rieck IMA Status Tue, 02 Nov 2010 09:02:57 +0000