Nickeline-annabergite from Ontario, Canada. (CMNH 11792, Cleveland Museum of Natural History, Cleveland, Ohio, USA)

~Coppery-colored material = nickeline Greenish = annabergite (Ni3(AsO4)2·8H2O - hydrous nickel arsenate)

A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 4900 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.

The sulfide minerals contain one or more sulfide anions (S-2). The sulfides are usually considered together with the arsenide minerals, the sulfarsenide minerals, and the telluride minerals. Many sulfides are economically significant, as they occur commonly in ores. The metals that combine with S-2 are mainly Fe, Cu, Ni, Ag, etc. Most sulfides have a metallic luster, are moderately soft, and are noticeably heavy for their size. These minerals will not form in the presence of free oxygen. Under an oxygen-rich atmosphere, sulfide minerals tend to chemically weather to various oxide and hydroxide minerals.

Nickeline (a.k.a. niccoline, niccolite) is a nickel arsenide mineral - NiAs. It has a metallic luster, a metallic pinkish-orange to pale copper color that tarnishes gray, and a gray streak. Nickeline is fairly heavy for its size, is moderately hard (H=5 to 5.5), and has no cleavage. It tends to occur with some Ni-Fe-Cu sulfide/arsenide minerals and with some Co-Ag minerals.

Locality: Cobalt, Ontario, Canada

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