cummingtonite
/ˈkʌmɪŋtənʌɪt
/noun [mass noun]
A mineral occurring typically as brownish fibrous crystals in some metamorphic rocks. It is a magnesium-rich iron silicate of the amphibole group.Accessory chlorite, magnetite or ilmenite, titanite, apatite, partly chloritized biotite, epidote, pyrite and sometimes cummingtonite, are present....
- This rock is a dark gray schistose rock containing radiating aggregates of cummingtonite and occasionally pyrrhotite.
- The two minerals can have similar distinctive brown colors and are hard to differentiate from each other, although cummingtonite is typically darker and slightly denser.
Origin
Early 19th century: named after Cummington, a town in Massachusetts, US, + -ite1.
- microsphere
- microspheric
- microspherulitic
- microspike
- microspined
- microsporangiate
- microsporangium
- microspore
- microsporic
- microsporidian
- microsporidiosis
- microsporidium
- microsporocyte
- microsporogenesis
- microsporon
- microsporophyll
- Microsporum
- microstate
- microstimulation
- microstomatous
- microstome
- microstratification
- microstratigraphic
- microstratigraphy
- microstrip