[meteorite-list] New Iron-Nichel posphide official name

From: Göran Axelsson <axelsson_at_meteoritecentral.com>
Date: Sat Nov 26 09:48:21 2005
Message-ID: <438876AA.90307_at_acc.umu.se>

I see the problem here. You said it was named "merrillite" in your
second mail and that was the mineral name I commented. In the abstract
it is one of the accessory minerals, not the name of the new phosphide.
I can't see anything about the name of the new phosphide mentioned in
the abstract. I doubt that melliniite is the official name as it usually
takes a long time to get a new mineral name accepted. But it probably is
the proposed name.

/G?ran

M come Meteorite Meteorites wrote:

>I doubt many is a old news, seen the found have
>presented in the last Met.Society Meeting
>
>A NEW IRON-NICKEL PHOSPHIDE FROM THE NORTHWEST AFRICA
>1054 METEORITE. V. Moggi-Cecchi1, L.Bindi2, and G.
>Pratesi2,3, 1Museo di Scienze Planetarie, Provincia di
>Prato, Via Galcianese, 20/h, I-59100 Prato, Italy,
>2Museo di Storia Naturale, Universit? degli Studi di
>Firenze, I-50121 Firenze, Italy, 3Dipartimento di
>Scienze della Terra, Universit? di Firenze, Via La
>Pira, 4, I-50121, Florence, Italy
>
>Introduction: NWA 1054 is a primitive achondrite
>(acapulco-ite) with a main mass weighing 86 g. The
>thin section displays a granular texture with olivine
>and low-Ca pyroxene as major phases and high
>Ca-pyroxene and plagioclase as minor; major
>non-silicate phases are metal and troilite. Accessory
>phases include merrillite, a Mg-rich chromite and two
>iron-nickel phosphides. Terrestrial weathering grade
>is low (W1) as well as shock stage (S1). The Museo di
>Scienze Planetarie of Prato (MSP) owns the type
>speci-men (MSP2366) [1].
>
>Description: Six natural phophides are known:
>schreibersite, (Fe,Ni,)3P, nickelphosphide (Ni,Fe)3P
>[2], barringerite (Fe,Ni)2P [3], allabogdanite
>(Fe,Ni)2P [4], florenskyite FeTiP [5] and perry-ite,
>(Ni,Fe)8(Si,P)3 [6]. In the course of a study on some
>acapulco-ites a new rather common iron-nickel
>phosphide was discovered in the NWA 1052 and 1054
>acapulcoites [7]. The chemical composi-tion of the new
>phase, determined by EMPA, is
>(Ni2.30Fe1.64Co0.01)&#931;=3.95P1.05, pointing to a
>4:1 metal/phosphorous ratio. It occurs as anhedral
>grains up to 100 &#956;m either associated with
>kamacite (Fig. 1A) or with nickelphosphide (Fig. 1B).
>Micro-indentation measurements provided a value (447
>kg/mm2) lower than nickelphosphide. In reflected
>light, the new phase is cream-yellowish, non
>pleochroic, isotropic, and shows no bireflectance,
>without internal reflections. Reflectance values are
>60.56, 50.44 52.51 and 55.94 % at 471.1, 548.3, 586.6,
>and 652.3 nm, respec-tively. A single-crystal X-ray
>diffraction study, carried out on a small crystal
>fragment, indicates a cubic lattice with a = 6.025 ?
>0.001 and points to a space group P213 with Z = 4.
>Both the coor-dination-number (12) and the density
>(7.882 g/cc) are the highest ever reported for
>phosphorus and iron-nickel phosphides, respec-tively.
>
>Conclusions: The structure and the physical properties
>suggest that the new iron nickel phosphide could play
>an important role for Earth?s core mineralogy. Due to
>the presence of this phase NWA 1054 acapulcoite seems
>to be a really peculiar acapulcoite if com-pared with
>literature data [8-9].
>
>References: [1] Moggi Cecchi V. & Pratesi G. (2005)
>MAPS, 40, in press [2] Sk?la R. & Dr?bek M. (2003)
>Min. Mag. 67, 783 [3] Buseck P.R. (1969) Science
>165,169 [4] Britvin S.N. et al., (2002) Am. Min.. 87,
>1245 [5] Ivanov A.V. et al., (2000) Am. Min. 85, 1082
>[6] Okada A. et al. (1988) MAPS 23, 59 [7]
>Moggi-Cecchi V., Pratesi G., Mancini L., (2005) LPSC.
>XXXVI, abs. #1808 [8] Patzer A., Hill D.H., Boynton
>W.V. (2004) MAPS 39, 61 [9] Scott E.R.D. & Pinault,
>L.J. (1999) LPSC. XXX, abs. #1507.
>
>
>
>Matteo
>
>--- G?ran Axelsson <axelsson_at_acc.umu.se> ha scritto:
>
>
>
>>What is the big news?
>>
>>Merrillite (Ca3(PO4)2) is found in several
>>meteorites. From martian
>>meteorites () to pallasites (Springwater). Another
>>meteorites containing
>>merrillite are Portales Valley, Forest Vale,
>>Ankober, Allegan, Allegan,
>>Estacado, and several more.
>>
>>And among the acapulcoites are Dhofar 1222.
>>
>>It doesn't seem to be such a rare phosphate to me.
>>
>>/G?ran
>>
>>M come Meteorite Meteorites wrote:
>>
>>
>>
>>>Hello
>>>
>>>Today in the Museo di Scienze Planetarie of Prato
>>>
>>>
>>it
>>
>>
>>>comes presented the new Iron-Nichel posphide found
>>>
>>>
>>in
>>
>>
>>>my acapulcoite NWA 1054. The official name of the
>>>posphide its melliniite.
>>>
>>>Matteo
>>>
>>>
>>>M come Meteorite - Matteo Chinellato
>>>Via Triestina 126/A - 30030 - TESSERA, VENEZIA,
>>>
>>>
>>ITALY
>>
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>
>M come Meteorite - Matteo Chinellato
>Via Triestina 126/A - 30030 - TESSERA, VENEZIA, ITALY
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Received on Sat 26 Nov 2005 09:52:26 AM PST