Mineralpedia Details for Clintonite

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Clintonite

Named for DeWitt Clinton, an American Statesman and naturalist from New York, USA where the mineral finds its type locality at Amity in Orange County. Clintonite is an uncommon but widespread mineral that can be found in additional USA localities as well as in Italy, Finland, Russia, Japan, on the island of New Guinea, among a few others. It occurs in chlorite schists, altered limestone, and siliceous skarn associated with contact metamorphism.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/clintonite.pdf

Formula: CaAlMg₂(SiAl₃)O₁₀(OH)₂
Crystal System: Monoclinic
Crystal Habit: Massive - Lamellar, Radial
Cleavage: Perfect, None, None
Luster: Pearly
Color: colorless, green, yellow, red, reddish brown
Streak: colorless
Class: Monoclinic - Prismatic
Fracture: Brittle
Hardness: 4-5
WebMineral: View Clintonite
Mindat: View Clintonite

Clintonite from Crestmore, Riverside Co., California, United States

Deep emerald green member of the Mica group. The largest crystal is 1cm across with many smaller groups.

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Clintonite from Amity, Orange Co., New York, United States

Special Info: Type Locality

Phyllosilicate - Monoclinic - Mica group member. Brittle Mica - Trioctahderal. Ca, Na, K occupying the Interlayer positions while Mg, Fe2+, Al, Fe3+, Mn in the octahedral positions.

Occurs as tabular, pseudohexagonal, foliated, lamellar radiate crystals. Occurs cheifly in association with calcite, idocrase, grossular, spinel, phlogopite in crystalline limestones i.e. Crestmore (Encycl. of Min.)

This is a large older specimen from the type locality formerly called serberitite.