Preface
August
is here, and time to continue our annual Summer Picfest with Schorl. With
an opaque, yet jet black sharpness, schorl is the most common (yet fascinating) of the
Tourmalines. So, get set to for some crystals that more than meet the eye. Let's
go!
Introduction
Welcome to
another annual Mineral
Picfest!
We're still in
the height of summer (winter in the southern hemisphere)! And, Schorl is
our esteemed choice this month. Most every nation in the world can brag about their
Schorl.
Enjoy!
Schorl
Our Schorl is part of the Elbaite-Schorl Series. Elbaite, Dravite and Schorl are all
part
of the Tourmaline
Group. Sometimes referred to as Schorlite, this tourm sports outstanding
crystal faces!
Schorl's chemistry of NaFe3B3Al3(Al3Si6O27)(OH)4
exhibits Iron, Boron, and more Oxygen
than our last two Summer Picfest minerals of Elbaite and Rubellite Tourmalines.
As a basic constituent of most earthly pegmatites, black tourmaline rules the roost as
occurring in an almost endless variety of mineral associations. It shares crystal
space with
such neighbors as quartz, feldspar, garnet, micas, and more!
Found
on seven continents, Schorl's commonality reaches across nations. Mineral
enthusiasts can gather and share stories about their encounters with their local black
tourmalines.
mindat.org database.
 |
|
 |
Fluorite
with Schorl and Quartz
(ex Nelson Collection)
Erongo, Namibia |
|
Schorl
with Albite
(ex Nelson Collection)
Doko, Shugar-Dassu, Balistan, Pakistan |
 |
|
 |
Schorl
with Quartz and Muscovite
(ex Nelson Collection)
Teofilo Otoni, Minas Gerais, Brazil
|
|
Schorl
Conselheiro Pena, Minas Gerais, Brazil |
 |
|
 |
Orthoclase
with Schorl
Orongo Mountains, Namibia |
|
Schorl
with Quartz crystal intergrown
(ex Nelson Collection)
Shigar Valley, Skardu, Northern Areas, Pakistan |
 |
|
 |
Schorl
on Quartz
(ex Nelson Collection)
Kollona, near Embilipitiya, Uva Prov., Sri Lanka |
|
Aquamarine
Beryl after Orthoclase with Schorl, Hyalite Opal
Erongo Mountains, Namibia
|
 |
|
 |
Schorl
Orongo Mountains, Namibia |
|
Schorl
(ex Yoder Collection)
Blue Sky Prospect, Santa Cruz, Sonora, Mexico |
| Photos by and courtesy of Isaias Casanova ©2007, IC Minerals |
 |
|
 |
Schorl
Sonora, Mexico |
|
Terminated
Schorl Crystal in matrix |
 |
|
 |
| Schorl
Crystals |
|
Schorl
Huachuca Mountains, southeastern Arizona |
| Photos courtesy of Roger Weller, Cochise College |
 |
|
 |
| Schorl
Crystal |
|
Schorl
Crystal |
| Photos courtesy of Stan Celestian, Glendale Community
College |
Uses
Tourmaline has had two
major uses: as a piezoelectric plate in instrumentation and as
a supreme gemstone. Schorl is the tourmaline that scientists, engineers, and
mechanics
rely upon in certain instrumentations. Both low- and high-tech, this useful tourm
can serve,
yet is rarely cabbed or faceted as gemstones, due to its brittle nature.
.
Links
http://en.wikipedia.org/wiki/schorl
http://www.webmineral.com/data/schorl.shtml
http://www.mindat.org/min-3472.html
Glendale Community
College Earth Science Image Archive: Tourmaline
Roger Weller's Mineral
Photo Gallery at Cochise College
Members' Gallery
Here is where DMS Members can add their Schorl
photos to share with us.
Until Next Time
We hope you have enjoyed our all too short visit to
Schorl. Please join us next month,
for another article, and we shall journey together!
Until then, stay safe, and happy collecting. 
Article Contributors
I would like to gratefully acknowledge the generous contributions of our fellow Schorl
enthusiasts,
collectors, authors, curators, professionals, and club members who made this
work possible. Thanks.
© 2007 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
article. 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.
Suggested Reading
|

|
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: kencasey98@yahoo.com.
|
|