Fig. 16 Morphology and inner structure of hollingworthite. BSE images. A: Epitactic hollingworthite (Hwr) on the faces of sperrylite (Spr). B: Enlarged area of the previous photo to show a scale of hollingworthite crystals (Hwr). C: An intergrowth of anhedral pentlandite (Pn), Mg silicate (Mg–Sil

Fig. 11. Back-scattered electron images of sulfarsenides located in the streams from Cliff. ( a ) Aggregate of irarsite (IrAsS) grains with altered and pitted surface. ( b ) Single grain of irarsite with an etched appearance. ( c ) The only composite grain of irarsite and hollingworthite (RhAsS

Fig. 14. Sample Mag 6 area 6 showing analysis points of inclusions and host isoferroplatinum nugget ( Table 6 ). Abbreviations: Cpe = cooperite, Gki = genkinite, Hlw = hollingworthite, Plt = S-rich sperrylite (former “platarsite”), Spy = sperrylite. (a) Area 6(1) analysis 1(164) Pt-Fe alloy host

Fig. 6 MLA false-color particle bitmaps from the Creighton mine sample for hollingworthite (bright green) (A, B, C: +53 μm, +20 μm, –20 μm fractions). Hollingworthite typically occurs in the core of a gersdorffite grain. The hollingworthite– gersdorffite pair is strongly associated

Fig. 10. (A and G) Photomicrographs, reflected light, oil immersion. All others are BSE images. (A and B) Three zoned laurite grains and strings of Pt-Fe alloy (white) along grain boundaries of olivine (note internal reflections in A). AS 7791d. (C) Zoned hollingworthite crystal enclosing ferroan

Fig. 14. Compositional fields for hollingworthite (RhAsS), irarsite (IrAsS), ruarsite (RuAsS), and platarsite (PtAsS); diagram after Cabri (2002 ; Fig. 31). See Figure 13 for the details of points 2, 6, and the circled points.

Fig. 15 Composition (at.%) of minerals of hollingworthite – irarsite – platarsite series from the Platreef in terms of the triangular diagrams Pt–Rh–Ir and (Ru + Os)–Rh–Ir. Small circles are compositions from the ultramafic pegmatitic pipes after Stumpfl (1972) , Tarkian & Stumpfl (1975

F ig . 8. BSE image and single-element X-ray mapping of polyphase hollingworthite, Rh–Ni–S, Pd–Sb–Te and native Pt inclusion for Rh, Ir, Pd, Pt, Ni, S, As and Sb.

TABLE 4. ATOM PROPORTIONS OF ZONED LAURITE–ERLICHMANITE AND IRARSITE–HOLLINGWORTHITE (PROFILE cd ), PENIKAT COMPLEX, FINLAND

TABLE 3. COMPOSITIONS OF ZONED LAURITE–ERLICHMANITE AND IRARSITE–HOLLINGWORTHITE (PROFILE cd ) FROM THE PENIKAT COMPLEX, FINLAND

TABLE 5. COMPOSITIONS OF ZONED LAURITE–ERLICHMANITE AND IRARSITE–HOLLINGWORTHITE (PROFILE ef ), PENIKAT LAYERED COMPLEX, FINLAND

TABLE 6. ATOM PROPORTIONS OF ZONED LAURITE–ERLICHMANITE AND IRARSITE–HOLLINGWORTHITE (PROFILE ef ), PENIKAT COMPLEX, FINLAND

Fig. 11. Back-scattered electron images of (a) euhedral hollingworthite-cobaltite intergrowth in actinolite from a chalcopyrite stringer, and (b) subhedral hollingworthite-cobaltite intergrowth in actinolite and chalcopyrite from the same chalcopyrite stringer.

Fig. 16. Sample A1 area 4 analysis points ( Table 7 , Fig. 16 BSE images. For context see Fig. 15 ). Abbreviations: Irs = irarsite, Apdn = arsenopalladinite, Trs = törnroosite, Hlw = hollingworthite, Spy = sperrylite. Homogeneous isoferroplatinum host analysis is 1(256). (a) Coarsest grained

to a fissure. (D) Enlarged field of (C) showing a PGM composed of laurite, sperrylite, and hollingworthite associated with rutile, Ni-sulfide (Ni-S), and chlorite. (E, F) Composite PGM associated with altered chromite and chlorite showing a complex intergrowth of laurite, hollingworthite, rustenburgite

, irarsite core type and comprises an irarsite core, a hollingworthite outer layer, and a PGE-rich Ni cobaltite rim. The second type (T-2), termed the anhedral, mixed core type, comprises an irarsite and/or hollingworthite mixed core and a PGE-rich Ni cobaltite rim. A. Typical euhedral, irarsite core type