ROCKWOOD ROCKHOUND NEWS for June,
2001
September Field Trip
We are still interested in getting a
group together for the Midwest Federation Show at Rice Lake, Wisconsin on
September 7-9, 2001. So far we have
five members interested. We should
probably firm up our reservations pretty soon. Check out the Chamber of
Commerce’s web page (www.rice-lake.com). If
interested, contact Claudia Uccello at 314-434-4831.
June 2001
Since many of us are traveling all over the country this summer, this e-mail
from`AKS Gem & Jewelry shows might be
of interest.
Dear
Rockhounds:
We
would just like to inform you of our show schedules.
Perhaps some of your members may have an interest in attending our gem,
jewelry, rock, mineral & fossil shows.
July
26, 27, 28, & 29, 2001 ~ Franklin, NC
September 6, 7, 8, & 9, 2001 ~ Tucson, AZ
February 2 thru 16, 2002 ~ Tucson, AZ
May 10, 11, & 12, 2002 ~ Franklin, NC
They
can get specific information by visiting our web site:
www.aksgemshows.com
Thanks,
AKS
Comments,
Etc.
Don’t forget that the Association show at
Queeny Park is coming up on August 17-19. We
need all kinds of workers: Set up,
pull down, hospitality, exhibitors, and
admissions table. Our club is
in charge of the admissions table. Call
Dianne and Andy Larson at 636-256-0241 to sign up to work a shift.
Remember that the profits of the show are divided up by the amount of
work each club does.
Our next club meeting will be on September
21, 2001. The
newsletter will resume in
September.
Our
June meeting will be held on Saturday, June 16th instead of the usual third
Friday of the month. We will
finish out the year with a picnic.
Picnic
Our annual picnic will be held at Claudia Uccello’s house on Saturday, June
16th from 3:00 to 6:00 pm. Bring
your swim suits, a chair and either a vegetable, salad or dessert.
The club will furnish the meat. If
the weather doesn’t co-operate, we will eat and visit inside.
Call Claudia at 314-434-4831 to sign up.
Bring Pictures
for Roy!
Minutes
of Rockwood
Gem and Mineral Society meeting
May 18th, 2001
Dianne Larson opened the meeting at 7:15,
welcoming a couple of guests for the evening, Martha Cottrell's mother and
another visitor, Caleb Simkoff. Caleb
showed us a Russian specimen he brought with him.
Andy
gave the treasurer's report
Income of $40 from dues
Expenses:
$57.72 newsletters and fliers
$45 science fair
$25 speaker honorarium
Balance
in the treasury $4237.94
Upcoming
dates in the newsletter were emphasized as well as some highlights
from the recent AFMS newsletter.
Everyone was encouraged to wear name tags. New ones have been made for recent
club members.
The
date of June 16, from 3-6 at Claudia's was set pending okay from Claudia. A sign
up sheet was started for potluck items of vegetables, salad and desserts. The
club provides the meat. Call Claudia
to see what is yet needed and let her know if you are coming.
Roy
Cottrell showed us what he has done to put photos for a club history on his lap
top. They look great! Please see that Roy gets any photos you may have of
members and try to have the
names on the back for identification, also your name for returning purposes.
Hank did a presentation on Mica and brought in some specimens for display. These
are always a highlight of the meeting.
Dianne will call members to set up times at the admission table for the August
17-19 show. Keep these days available both to work and see the show. It is at
Queeny Park.
We had ten in attendance, 8 members and 2 guests.
Our
speaker for the night was Dr. Jeff Gillis from Wash. U. and he spoke on lunar
geology. We learned more about the
moon than one could fathom! Quite a fascinating talk. Roy said that he had drawn
up some of the maps for one of the Apollo flights.
Meeting
was adjourned at 9pm.
submitted
by Dianne Larson
Polished
rock cabs for sale
My father-in-law was a rock hound. He dug all over Idaho and Oregon. He and my
husband have both now passed on. I have many finished & polished rock cabs
(mostly agate) that I would like to sell. Since I am not "in the
business", I really don't know a fair asking price. I know they are worth
some money, but am not looking to get rich. If you are interested, please
contact me.
Lynn
Chaney
P. O. Box 291
Fort Scott, Kansas 66701-0291
e-mail Lynn@hotmail.com
News
from Other Clubs
Pyrite & Marcasite Decomposition
Excerpts
of a talk by Frank Howie on Unstable Minerals
The
Geological Society (UK)
Under appropriate conditions many pyrite and
marcasite specimens will decompose into a gray or white powder and sulfuric
acid. This not only leads to the
loss of the specimen but can damage cabinets and affect near-by specimens by the
release of acid.
The
process of decomposition is oxidation. FeS2 oxidizes
to ferrous sulfate and sulfuric acid. It
has been held that bacterial action is necessary for the oxidation of the
sulfide to occur under normal environmental conditions.
Frank Howie has investigated the chemistry of this process over a number
of years and had conducted many controlled experiments.
He concludes that bacterial action plays no part at all, so antibacterial
treatment of specimens is useless.
The
essential condition is exposure to air at high relative humidity.
At an RH of less than 50%, very little decay of pyrite occurs.
At around 55% RH the rate rises rapidly and continues to increase as the
RH nears 100%.
Some
pyrite appears to resist the attack when
all around disintegrate. Scanning
Electron Microscopy has shown that
the attack starts in regions having microcrystalline structure.
If the structure has crystallite size in excess of 10 um, the
crystallites will be angular and packed. Below
1um the crystallites are rounded with open interstices giving a microporous
structure. This acts like a sponge
and provides a path for the moisture ingression at the start of the decay
process. Similar decomposition
occurs in many other sulfides, e.g. Arsenopyrite, Realgar, Chalcocite, Stibnite
and Argentite.
The
remedy is the keep in specimens in an RH below 50%.
This is generally achieved most of the time in a cabinet having close
fitting doors situated in a living room environment.
To ensure full-time protection the use of silica gel as a desiccant in
suggested.
Ed. note: Since humidity is such a
problem in St. Louis, the above article is helpful for us.
Did the Louis and Clark Expedition Discover
Mozarkite at Rocheport?
One version of William Clark’s journal for June 7,
1804 describes their landing and encampment near the mouth of the Big Moniteau
Creek, the site of present day Rocheport. Their
comments were “a short distance of the mouth of this creek are several
paintings and carvings in the projecting rock of limestone inlaid with white,
red & blue flint, of very good quality, the Indians have
taken of this flint great quantities.” (The CMRLC editor knows of no
subsequent mentions of this colorful flint in the Rocheport area, although some
have suggested that the cliff and flint bearing outcropping was destroyed when
the railroad bed and tunnel were cut through just upstream from Rocheport.)
Shortly
following the declaration of Mozarkite as the official Missouri state stone,
Willis Smith published and interesting and comprehensive article on Mozarkite in
the 1968 Lapidary Journal where he also noted this interesting entry in
Clark’s Journal. Willis also
points out that Mozarkie or its equivalent is found at a wide variety of
locations other than the classic location near Lincoln, Mo in Benton. Co.
Perhaps
with the approach of bicentennial of the expedition and the enhanced interest in
their journey through Missouri and the encampments near Rocheport someone will
find some of this flint.
Mozarkite
in the Lincoln, Mo area is found associated with the Cotter Dolomites while the
bed rock at Rocheport is the Burlington Dolomites of a different age.
As a
Rockhound Sees It
Sheer
Luck - someone else’s good find
Hard work & Brains - your own
good find
Greed - someone else’s large
quantity of one specimen
Foresight - your own large quantity
of one specimen
Stinginess
- someone else’s refusal to share
good rock locations
Shrewdness
- your own refusal to share good rock
locations
Bunch
of junk - someone else’s collection
Museum
pieces - your own collection
Botched
up job- some one else’s first
lapidary attempt
Promising
beginning - your own first lapidary
attempt.
via: Cross
Timbers Talks, 9/89
Tidbits
Field Trippers, use plastic jugs (milk, bleach, etc) for rock holders.
Cut off the neck, leaving the handle.
Location of your finds can be marked on the jug with a magic marker.
The plastic jugs are not harmed by dampness or dirt. |