Amphibole Minerals from New York State
The amphibole group constitutes the most chemically complex mineral group in nature and their component atoms have a distinctive arrangement known as a double silicate chain. The more than 75 amphibole species are divided into four sub-groups based on their main chemical element.
Amphiboles are essential minerals of igneous and metamorphic rocks and are wide spread in New York State with 22 species known to be present. The Upper Marble Formation in St. Lawrence County and the Franklin Marble of Orange County are two locations where beautiful amphibole crystals, some of gem quality, occur. The world's finest "hexagonite" tremolite and chrome tremolite are found in St. Lawrence County. Edenite, a calcic amphibole, was first discovered and described as a new mineral species in Edenville, Orange County.
The New York State Museum possesses a world-class collection of amphiboles, some of which are displayed in this case. Our amphibole collection is currently the subject of ongoing research by the Museum's Center for Mineralogy.