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North Mountain Serpentine locality ("Dunite Locality" of Emerson), Cheshire, Berkshire Co., Massachusetts, USA

Ultramafic tectonic "sliver" thrust fault deposit, age unknown - possibly Ordovican, possibly Proterozoic-Z. (Note: Most of the minerals listed are found as minor constituents of the deposit or in the abutting country rock. The bulk of the deposit is antigorite. Some of the species listed in Emerson proved to be in error and are not repeated here.)

Mineral List

Actinolite
Albite ?
var: Andesine ?
var: Oligoclase ?
'Albite-Anorthite Series'
Almandine
Antigorite
Biotite
Brucite
Calcite ?
'Chlorite Group'
Chrysotile
'Clinopyroxene Subgroup'
Epidote
Fayalite ?
Forsterite
Graphite
Hematite
'Hornblende'
Magnetite
Muscovite
Quartz
Talc
Tremolite ?
Vesuvianite
Zircon


26 entries listed. 19 valid minerals.

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Copyright © Jolyon Ralph and Ida Chau 1993-2011. Jobs in Massachusetts, USA Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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