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While externally similar shapes, these two minerals are very different inside.
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Pumpellyite Subgroup from
Francisco Brothers Quarry, Great Notch, Little Falls Township, Passaic County, New Jersey, USA


Locality type:Quarry
Classification
Species:'Pumpellyite Subgroup' (not an IMA approved species)
Formula:Ca2XAl2[Si2O6(OH)][SiO4](OH)2A
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Prehnite1
Heulandite Subgroup1
Data
Mineral Data:Click here to view Pumpellyite Subgroup data
Locality Data:Click here to view Francisco Brothers Quarry, Great Notch, Little Falls Township, Passaic County, New Jersey, USA
Data Identifiers
Mindat Occurrence Record ID:73181
Long-form Identifier:1:3:73181:8
GUID (UUID V4):0
Nearest other occurrences of Pumpellyite Subgroup
8.2km (5.1 miles) ⓘProspect Park Quarry, Prospect Park, Passaic County, New Jersey, USA
12.7km (7.9 miles) ⓘRiker Hill, Livingston, Livingston, Essex County, New Jersey, USA
21.3km (13.3 miles) ⓘHoudaille Quarry (Summit Quarry; Commonwealth Quarry), Springfield, Springfield Township, Union County, New Jersey, USA
28.8km (17.9 miles) ⓘFanwood Quarry (Weldon Quarry), Watchung, Somerset County, New Jersey, USA
33.2km (20.6 miles) ⓘScrub Oaks Mine, Mine Hill, Morris County, New Jersey, USA
References
Amer. Museum of Nat. History, NY, specimen.
 
and/or  
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