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                           Mineral of the Month--August


                                       Fosterite Olivine


                   Peridot Picfest

                     By Ken Casey

Peridot Picfest!
Photo & Graphics Credits
Invitation to Members
Past Minerals of the Month
peridot_egypt.jpg (3256 bytes) Peridot from Red Sea, Egypt

Of Apple green its inner sheen...



...hue holding place from outer space: Peridot!

The above image is courtesy of Isaias Casanova of IC Minerals 2005


     Peridot is a wondrous gemstone!  Found in volcanic rocks and in some meteorites as
an accessory, and most widely in riverbeds, this truly apple green crystal is easy to discern
from its surrounding rock.

     In this month's Mineral of the Month, we will be offering more and larger pictures.  In
fact, we will be displaying a gallery of fine photos of peridot specimens from around the world! 
We will save the science for another day, so as to not interfere with our viewing pleasure of
this spectacular crystal.  Please, do enjoy.  (And no hard hats required this trip!)


     Peridots are almost unique in the mineral kingdom.  As they form only one way, through
volcanism, they are only found in igneous rocks from Earth and from those that land here
from interplanetary space.  Their greenish hue sometimes connotes any eery, otherworldly
feeling, like the special fluorescent green favored by movie and television show special effects

     This month, we are going to set aside our jewelry, and partake in an ocular feast of
this somewhat scary gemstone.  Let's view!


Peridot Picfest!

fig7.gif (23245 bytes) Peridot rough from the San Carlos Apache
Reservation in Arizona 

Image courtesy of USGS


2739.jpg (24162 bytes) 2739a.jpg (22587 bytes)

Fosterite var. Peridot from Zabarjad, St. John's Island, Egypt

Images courtesy of Isaias Casanova at IC Minerals 2005




Until Next Time

     We hope you enjoyed your virtual peridot tour.   Perhaps your experience will inspire you
to collect peridot, or even to travel a bit to witness them for yourself in your local museum.

     Until then, stay safe, and happy collecting. hardhat2a.gif (5709 bytes)


Photo & Graphics Credits

Isaias Casanova, IC Minerals
Jolyon Ralph,
ICA/ Bart Curren through the United States Geological Survey

I would like to gratefully acknowledge the generous contributions of our fellow peridot
enthusiasts, collectors, authors, curators, professionals, and club members who made this
work possible. 


2005  All contributions to this article are covered under the copyright protection of this article
and by separate and several copyright protection(s), and are to be used for the sole purposes of
enjoying this scholarly article.  They are used gratefully with express written permission of the
authors, save for generally-accepted scholarly quotes, short in nature, deemed legal to reference
with the appropriate citation and credit.  Reproduction of this article must be obtained by express
written permission of the author, Kenneth B. Casey, for his contributions, authoring, photos, and
graphics.  Use of all other credited materials requires permission of each contributor separately

Links and general contact information are included in the credits above, and throughout this article.
The advice offered herein are only suggestions; it is the reader's charge to use the information
contained herein responsibly.  DMS is not responsible for misuse or accidents caused from this
  All opinions, theories, proofs, and views expressed within this article, and in others
on this website, do not necessarily reflect the views of the Delaware Mineralogical Society.

KEN.JPG (31503 bytes)

   About the Author:  Ken is current webmaster of the Delaware Mineralogical Society.  He has a diploma in Jewelry Repair, Fabrication & Stonesetting from the Bowman Technical School, Lancaster, PA, and worked as jeweler.  He has also studied geology at the University of Delaware.  And, he is currently a member of the Delaware Mineralogical Society and the Franklin-Ogdensburg Mineralogical Society.  E-mail:

Invitation to Members


Want to see your name in print?  Want to co-author, contribute, or author a whole Mineral of the Month article?  Well, this the forum for you!

And Members, if you have pictures, or a story you would like to share, please feel free to offer.  We'd like to post them for our mutual enjoyment.   Of course, you get full photo and author credit, and a chance to reach other collectors, hobbyists, and scientists.  We only ask that you check your facts, give credit where it is due, keep it wholesome for our Junior Members watching, and keep on topic regarding rockhounding.

You don't even have to be experienced in making a webpage.  We can work together to publish your story.  A handwritten short story with a Polaroid will do.  If you do fancier, a text document with a digital photo will suit, as well.   Sharing is the groundwork from which we can get your story out there.

Our club's webpages can reach any person surfing the net in the world, and even on the International Space Station, if they have a mind to view our website!

We are hoping for a possible tie-in to other informative programs upon which our fellow members might want to collaborate.  Contact any officer or board member with your suggestions.

September's MOTM will be a surprise.  For October 2005, we are waiting for your suggestions.  What mineral do you want to know more about?

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Most of the Mineral of the Month selections have come from most recent club fieldtrips and March Show Themes, and from inspriring world locales and birthstone & gemstones. thus far.  If you have a suggestion for a future Mineral of the Month, please e-mail me at:, or tell me at our next meeting.






Next Meeting

April Program, Monday, April 8, 2013:

"Destruction of the Fossil Exposures in the Chesapeake Bay Area" presented by Dr. Lauck Ward

General Club Meeting:
April 8, 2013

We are meeting at
Greenbank Mill

Special Meetings:

*Show Committee Meeting, April or May, 2013

*New Home/Lapidary Committee, 2013

*Board Meeting,  April, 2013

Next Field Trips


Past Fieldtrips

Next Show
DMS March Show
March 1-2, 2014 at DelTech Stanton


Our 2013 Show Theme was:
"All That Glitters is as Good as Gold!"

March Show 2013 Report






Fossil Forum

"Dinny, the Dino"

"Belemnites are coming"


MOTM June also commemorates our 50th Show!

It's shiny, yellow, and is a symbol of 50 Years!Can you guess?


Collecting Adventure Stories:

"Sunny Brook Crick Goethite" by Joe Dunleavy