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 ?
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.
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.
Dark green pumpellyite in earthy compact masses has been reported from the Bor pit.
Small amounts of clinochlore and pumpellyite are found, but most collectors refer to them collectively as "chlorite.
2+]) are followed by pumpellyite-(Mg) and pumpellyite-(Mn), but the etymology of the name pumpellyite is not given until the pumpellyite-(Mg) entry (presumably because that was the original description).