ASR Technology. 1  ControlMaster Elite VFD + A-motor = ASR. 2  Intelligent speed control - the right speed at the right time! 3  Extended speed range at light loads (<40 4 %) Adjustable speed range at heavier loads (> 40 %) Rated speed at full load is half the rated speed of equivalent 2-speed hoist.
The mineral pyrite, or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula FeS2. This mineral's metallic luster and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of fool's gold. The color has also led to the nicknames brass, brazzle, and Brazil, primarily used to refer to pyrite found in coal. Pyrite is the most common of the sulfide minerals. The name pyrite is derived from the Greek ÏÏÏÎ¯ÏÎ·Ï (pyritÄs), of fire or in fire, in turn from ÏÏÏ (pyr), fire.
Pyrite is the classic Fool's Gold. There are other shiny brassy yellow minerals, but pyrite is by far the most common and the most often mistaken for gold. Whether it is the golden look or something else, pyrite is a favorite among rock collectors. It can have a beautiful luster and interesting crystals. It is so common in the earth's crust that it is found in almost every possible environment, hence it has a vast number of forms and varieties. Bravoite is the name given to a nickel-rich iron sulfide. It is closely related to pyrite but contains up to 20% nickel.