The 1,025 th meeting of 

The Mineralogical Society


Southern California



Program: Quartz of New Mexico


Presented by: Erin Delventhal

Friday, May 10, 2024 at  7:30 pm.

See program notes below

Visitors are always welcome

About us…

The MSSC is a member of the California Federation of Mineralogical Societies and is dedicated to the dissemination of general knowledge of the mineralogical and related earth sciences through the study of mineral specimens.  We are a scientific non-profit organization that actively supports those endeavors through public outreach, field study and related programs.

For more information

Notice of July 29, 2023 regarding Mojave Trails National Monument.  Reprinted with permission from San Diego Mineral & Gem Society.  Great commentary in the notice by its author, Lisbet Thorensen, SDMG’s Public Lands Representative.  Thank You, SDMG and Lisbet.  Angie Guzman, MSSC President.Please click here to read article and commentary.

Program Notes: Friday, May 10, 2024 at 7:30, join us for “Quartz of New Mexico”  Presented by Erin Delventhal.

Though New Mexico may be better known amongst mineral collectors for smithsonite or fluorite, it is also home to a wide variety of quartz deposits. Some of these localities are well-known to the mineral collecting community, while others are known predominantly by locals. This presentation will offer an overview of New Mexico quartz specimens, demonstrating the range of varieties (smoky, amethyst, chalcedony, etc.), and forms (twins, pseudocubes, scepters, etc.) that the state has produced.

Erin Delventhal grew up collecting minerals with her family – long road trips were punctuated with detours where she and her brothers could get dirty (and very tired) while collecting minerals. Photography and design took precedence as a hobby and a profession for many years, but a visit to the Tucson Gem & Mineral Show rekindled her love for minerals. She rejoined the mineral community with enthusiasm and has since been an active member in several organizations ranging from local to international, has been involved in mineral museums, symposia, and other educational programs, and has joyously returned to a life punctuated by getting dirty (and very tired) while collecting minerals.Among other things, Erin works as a freelance photographer, photo editor, and graphic designer.


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

Non Members, you must request to attend the MSSC zoom meeting every month Email our Programs chair, Rudy Lopez at  no later than the Thursday before the scheduled meeting   Please include “ZOOM Meeting” in the subject line of your response. We will send you the meeting link.

Upcoming Events

all events, except field trips are via  ZOOM

  • June 14, 2024: Les Presmyk – TBA likely on Mexico minerals
  • Board Meeting, Sunday April 14, 2024 at 1:00 pm
  • CFMS/AMS Show in Ventura, May 24-26.
  • August 24, 2024: MSSC Picnic-Technology Park, Caltec Campus Watch for more details

The MSSC is pleased to offer the updated 2023 edition of Bob Pedersen’s X- Dana 

X-Dana Mineral Spreadsheet