pumpellyite


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pumpellyite

[‚pəm′pel·ē‚īt]
(mineralogy)
Ca2 Al3Si3O12(OH) A greenish epidote-like mineral that is probably related to clinozoisite. Also known as lotrite; zonochlorite.
References in periodicals archive ?
Subsequently, albitisation transformed scapolite metagabbro and regionally distributed mafic and granitoid rocks to albitites, dominated by albite, with varying amounts of rutile, carbonate, chlorite, and locally prehnite, pumpellyite, and analcime.
Most samples are metabasalts that belong to the chlorite zone of the greenschist facies, but other rock types include metagrey wackes and a metabasalt of the prehnite/ pumpellyite facies, and a glaucophanic metachert and glaucophanic metabasalt of the blueschist facies.
These include pumpellyite and members of the chlorite group, all of which form as tiny clusters of greenish black to black microscopic crystals on other minerals and on cavity walls.
Chlorite, prehnite, and sporadically developed pumpellyite indicate that the rocks have reached prehniteactinolite facies conditions.
Low temperature recrystallizations often occur (pumpellyite).
The presence of pumpellyite and minor epidote suggests that temperatures in the Preakness Basalt were elevated for a brief time to just over 200[degrees]C (Kristmannsdottir, 1979; Seki, 1972).
At locality 26, fibrous mesolite forms overgrowths on chabazite-Ca in cavities in diopside-meionite-phlogopite gneiss; at locality 47 it occurs as bundles of fibers associated with pumpellyite, chabazite-Ca, prehnite and thomsonite in voids in calcite and calc-silicate rock.
Chuck Trantham recalls that Jack collected nissonite at the type locality in San Benito County, California, with Charles Chesterman, pumpellyite and omphacite near Cazadero, California, with George Switzer and Al McGuinness, and parahopeite at Broken Hill, Zambia, with Al McGuinness and Luis Leite.
Julgoldite, on the other hand, is a complex silicate belonging to the pumpellyite group.
Calcite, pumpellyite and hematite are also widespread.
Pumpellyite [Ca.sub.2](Mg,Fe)[Al.sub.2]([SiO.sub.4])([Si.sub.2][O.sub.7)[(OH).sub .2].[H.sub.2]O