Red arsenic nickel ore (Niccolite)

NiAs

[Chemical composition] Fe, Co, S, etc. may be mixed with the same type of image. In addition, there are also Sb, Bi, and Cu, and their occurrence states are unknown.

[Crystal structure] hexagonal crystal system; ; a ₀ = 0.361 nm, c ₀ = 0.502 nm; Z = 2.

Figure L-9 Crystal structure of red arsenic nickel ore

(quoted from Pan Zhaoyu et al., 1993)

The red arsenic nickel ore is a typical structure: As is most closely packed in hexagonal shape, and Ni fills all octahedral voids (Fig. L-9). The [NiAs ₆ ] octahedron coplanar parallel to the c-axis direction is connected into a linear chain, and the [NiAs ₆ ] octahedron is co-edged in the horizontal direction. Ni (coordination number of 6), and often two vertical short distance in addition to Ni 6 As is surrounded by an outer, into its nearest neighbor, so that the key of which niccolite is obvious to the gold metal Key transition.

[Form] It is usually a dense block or granular aggregate, and sometimes it has a colloidal form such as a kidney. The single crystal is hexagonal or plate-shaped, but it is rare.

[Physical properties] fresh face pale copper red, weathered mask gray or black ochre; strips brown black, metallic luster. The cleavage parallel {1010} is not complete; the fracture is not flat. Hardness 5. The relative density is 7.6 to 7.8. Crisp. Strongly conductive.

[genesis and occurrence] are common in hydrothermal deposits, and sometimes found in the late hydrothermal processes of copper-nickel sulfide magma deposits related to basic and ultrabasic rocks.

[identification features] light copper red and metallic luster. It is fusible and forms an As ₂ O ₃ white film on charcoal by oxidizing flame, and has a raw garlic odor.

[Main use] Nickel ore mineral raw materials.

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