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Pumpellyite-(Mg) from
O & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry), Southbury, New Haven Co., Connecticut, USA

Locality type:Quarry
Classification
Species:Pumpellyite-(Mg)
Formula:Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Comments:Based on the chemical formula given in Garabedian (1998), the species is pumpellyite-(Mg). One of the first minerals to crystallize in vesicles, so is typically present between later minerals and the basalt matrix, a second stage crystallization came after early calcite, anhydrite, chalcedony, a trapezohedral zeolite, and datolite and so may coat or replace these minerals. May by itself fill entire vesicles.
Habit:fibrous micro-crystals
Colour:dark olive green
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Very common
Confirmation
Validity:Confirmed
Confirmation Methods:Wet Chemical
References
References:Garabedian, James A. (1998), Secondary Mineralization of Half-Moon Vesicles in the Mesozoic Basalt of the O&G#2 Quarry, Woodbury, Connecticut. University of Connecticut Master of Science Thesis; www.johnbetts-fineminerals.com/jhbnyc/mineralmuseum
Associated Minerals Based on Photo Data:
Prehnite1 photo of Pumpellyite-(Mg) associated with Prehnite at this locality.
Laumontite1 photo of Pumpellyite-(Mg) associated with Laumontite at this locality.
Quartz1 photo of Pumpellyite-(Mg) associated with Quartz at this locality.
Data
Mineral Data:Click here to view Pumpellyite-(Mg) data
Locality Data:Click here to view O & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry), Southbury, New Haven Co., Connecticut, USA
Photo GalleryView Gallery (2 photos)
 
Mineral and/or Locality  
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