4.2 Article

Orishchinite, a new terrestrial phosphide, the Ni-dominant analogue of allabogdanite

Journal

MINERALOGY AND PETROLOGY
Volume 116, Issue 5, Pages 369-378

Publisher

SPRINGER WIEN
DOI: 10.1007/s00710-022-00787-x

Keywords

Pyrometamorphism; Gabbro-dolerite; Phosphide; Jordan; Crystal structure; Hatrurim formation

Funding

  1. Russian Science Foundation [18-17-00079]

Ask authors/readers for more resources

Orishchinite is a new terrestrial phosphide discovered in Jordan, characterized by its unique mineral composition and structure.
Orishchinite is a new terrestrial phosphide discovered in pyrometamorphic rocks of the Daba-Siwaqa combustion complex in West Jordan. The mineral occurs as an accessory phase in the fused clinopyroxene-plagioclase rock (paralava) texturally resembling gabbro-dolerite. Orishchinite forms resorbed equant grains up to 0.2 mm outrimmed with 0.1-0.2 thick zones of substituting murashkoite, FeP. Chemical composition (electron microprobe, wt%): Ni 38.49, Fe 22.38, Co 0.47, Mo 18.80, P 19.46, Total 99.60, corresponding to the empirical formula (Ni1.04Fe0.64Mo0.31Co0.01)(sigma 2.00)P on the basis of 3 apfu. The simplified formula is (Ni,Fe,Mo)(2)P and the ideal one is Ni2P. Macroscopically, orishchinite grains have yellowish-white colour with metallic lustre. The mineral is brittle. In reflected light, orishchinite is yellowish-white and non-pleochroic. It is very weakly anisotropic (Delta R-589 = 1.3%). Reflectance values for the wavelengths recommended by the Commission on Ore Mineralogy of the International Mineralogical Association are [R-max/R-min (%), lambda (nm)]: 48.1/47.5, 470; 50.6/49.4, 546; 52.1/50.8, 589; 54.4/52.9.1, 650. The crystal structure was solved and refined to R-1 = 0.016 based on 224 unique observed [I >= 2 sigma(I)] reflections. Orishchinite is orthorhombic, space group Pnma, a 5.8020(7), b 3.5933(4), c 6.7558(8) angstrom, V 140.85(3) angstrom(3), Z = 4, D-x = 7.695 g cm(-3). The strongest lines of the powder X-ray diffraction pattern [(d, angstrom) (I, %) (hkl)] are: 2.265(100)(112), 2.201(16)(202), 2.142(55)(211), 2.100(35)(103), 1.909(21)(013), 1.811(19)(113), 1.796(31)(020). Orishchinite is dimorphous with transjordanite (hexagonal Ni2P) and can be considered the Ni-dominant analogue of allabogdanite.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.2
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available