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Formula: Ca2Fe2+Al2(Si2O7)(SiO4)
(OH,O)2.H2O
Sorosilicate (Si2O7 groups),
pumpellyite subgroup of
the pumpellyite group, forms a series with
julgoldite-(Fe2+) and with
pumpellyite-(Mg)
Crystal System: Monoclinic
Specific gravity: 3.31 measured, 3.35 calculated
Hardness: 5
Colour: Greenish black
Environments
Localities
At the type locality, the Ivakin Creek, Noril'sk, Putoran Plateau, Taimyr Peninsula, Taymyrskiy Autonomous Okrug,
Krasnoyarsk Krai, Russia, pumpellyite-(Fe2+) occurs in the contact zone around an intrusive,
associated with prehnite,
babingtonite, clinopyroxene and
calcite
(HOM).
At Croft Quarry, Croft, Blaby, Leicestershire, England, UK, the
prehnite-pumpellyite
wall-rock alteration haloes that surround the zeolite - containing veins in the
quartz - diorite contain
pumpellyite-(Fe2+),
associated with prehnite, chlorite,
quartz and analcime, and also minor
muscovite variety sericite, kaolinite and
smectite
(JRS 20.23).
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