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pentlandite

pentlandite An iron and nickel sulphide, with the formula (FeNi)9S8, and the main ore mineral for nickel; sp. gr. 4.5–5.0; hardness 3–4; cubic; light bronze-yellow; greenish-black streak; metallic lustre; very rarely found in well-formed crystals, usually occurring as irregular grains and inclusions; no cleavage, parting {111}; occurs with the other sulphide ores genetically associated with basic and ultrabasic rocks, together with pyrrhotine and chalcopyrite.

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Pentland Firth

Pentland Firth (pĕnt´lənd fûrth), channel, 6 to 8 mi (9.7–12.9 km) wide and c.14 mi (23 km) long, N Scotland. Connecting the North Sea with the Atlantic Ocean, it separates the Scottish mainland from the Orkney Islands. Its rough waters have proven dangerous to small vessels. Small islands dot the Pentland Firth.

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pentlandite

pentlandite (pĕnt´ləndīt), yellowish-bronze, opaque mineral, a sulfide of iron and nickel, (Fe,Ni)9S8. It is found in masses nearly always associated with the iron sulfide pyrrhotite. The largest deposit of this important ore of nickel is at Sudbury, Ont. Important deposits are mined in Manitoba, Russia, and W Australia.

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