The 989th meeting of 

The Mineralogical Society


Southern California


May Meeting

ZOOM presentation

The Tilly Foster Mine, A Classic Mineral Locality

 Presented by Howard Heitner

Friday, May 14, 2021 at  7:30.

See program notes below

Visitors are always welcome

About us…

The Mineralogical Society of Southern California is dedicated to the dissemination of a general knowledge of the mineralogical and related earth sciences through the study and collecting of mineral specimens. Organized in 1931, it is the oldest mineralogical society in the western United States.
The MSSC is a scientific non-profit organization that actively supports the Pasadena City College Geology Department,   Field Science Scholarship Fund.  Support is also given to Mindat.
The MSSC is affiliated with the California Federation of Mineralogical Societies and American Federation of Mineralogical Societies.

For more information

Program Notes: 


Effective April, 21, 2021

MSSC members will be automatically on the invite list each month.

For Non Members:

You must request to attend the MSSC zoom meeting every month.

See Meeting page for details.

Yes, the General Meetings at our normal PCC meeting location have been cancelled. BUT! There will be an internet meeting via ZOOM. Our President, George Rossman is offering a MSSC meeting via ZOOM as follows: He uses Caltech’s ZOOM license which allows meetings to last as long as the need [Caltech has given him permission to do this]. To sign up for the meeting see instructions in the current month’s bulletin.

Join us: Friday, May 14, 2021 at 7:30. 

Presenter: Howard Heitner: “The Tilly Foster Mine”: A Classic Mineral Locality. The speaker has been collecting minerals for sixty years. He started as a field collector, collecting in New York, New Jersey, Maine and other states. Later he started purchasing specimens. He purchased several old collections and became interested in the history of mineral collecting and dealing in the United States. His other interests include fluorescent minerals and pseudomorphs. He was the president of the Stamford Mineralogical Society for many years. In his professional career he was a chemist specializing in water soluble polymers. Most of his career was spent at Cytec Industries in the development of new products used to process minerals. His post retirement mineral time has been spent finally organizing and cataloging his collection and as a volunteer at the AMNH in New York.

The Hudson valley was the center of American iron mining and production through the 1860’s.  The ore was massive magnetite.  A small iron mine in Putnam County New York worked in the late 1800’s produced many high quality crystallized mineral specimens in the relatively short time it was worked. The unique mineralogy was brought to the attention of mineralogists by chance. Among these minerals were magnetite, chondrodite, clinochlore and titanite.  Many pseudomorphs were also found there. The talk covers the geology and mineralogy of the mine.  Also covered are the history of the mine itself, the relatively modern mining methods used and the sudden end of mining in 1896.

***Members who want to do this must respond to our Programs chair, Rudy Lopez at  no later than Tuesday May 11, 2021.  Please include “May ZOOM Meeting” in the subject line of your response. This response date will allow time for us to send you the information needed to participate in the ZOOM meeting and also will allow time to get everything organized at Caltech. 


Upcoming Events

  • April 25, 2021: Board Meeting via ZOOM

  • June 11, 2021: Peter Goetz: Beautiful Opal, Identification and Internet Opal via ZOOM

  • July 9, 2021: Eric Scerri: the Periodic Table: It’s Story & It’s Significance via ZOOM
  • August 13, 2021: Krista Sawchuk: Discovering the Deep Earth via ZOOM

  • September 10, 2021: Alan Rubin: The Origin of Chondrules via ZOOM

Important news about the MSSC Roster

The MSSC is pleased to offer the new 2020 edition of Bob Pedersen’s X- Dana 

X-Dana Mineral Spreadsheet