LAPIDARY DIGEST
Administered by Hale Sweeny (hale2@mindspring.com)
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This list digest contains the following message subjects:

1. LapDigest News for Issue No. 31 Sunday 7/20/97
2. New: Orienting Cat's Eye Aquamarine
3. RE: Can this be cheap??!
4. Re: Dangers of Rock Dust
5. RE: Dangers of Rock Dust
6. Re: Copyright


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<MSG1>
Subject: LapDigest News for Issue No. 31 Sunday 7/20/97

As many of you on the East Coast know, one of the best gem shows in this area is at Franklin, NC. I will be going there this week, and from there to my wife's family reunion. So the LapDigest won't be pblished after Wednesday July 23 until Tuesday, July 29th. Please continue sending in queries and responses and we will have a whale of a digest when we resume. I will leave the computer on so subscriptions and archival retrievals may continue while I am gone.

Got this message from Mark Case; thought you would want to read it. (To newcomers, Mark is a frequent contributor, and had a recently delivered
baby.) "Thank you for ALL the notes and prayers about Micah. He is coming home we hope on Tuesday, July 22. All his tubes are now out, he is
breathing on his own and is taking milk from a bottle. He does not get the idea of latching on for breast feeding yet, but the nurse said he will. Thank God for the miracles and all your prayers." Mark & Roberta Case

And please remember: Each author is requested to write the words
"-- non-commercial republish permission granted --" at the end of every
item submitted. This gives permission for others to use your item for
non-commercial purposes. Then clubs may legally pick up the items and
reprint them in club bulletins, and thus your words may have wider
circulation and influence. Please use those four words at the end of
each item you submit. And read the discussion below and send in any
comments you may have about this request.

hale
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<MSG2>
Date: Thu, 17 Jul 1997
From: Bacchus803@aol.com

Subject: New: Orienting Cat's Eye Aquamarine


I picked up some cat's eye aquamarine a while back but I'm having some
trouble orienting the stones. I've got a polariscope but that's only
giving the center axis. How can you tell which direction the grains run
on transparent rough? I would appreciate any insights.

Thanks
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<MSG3>
Date: Fri, 18 Jul 1997
From: bsmith@infodial.net

Subject: RE: Can this be cheap??!


As a beginner or if money or space is an issue, my suggestion would
be to join a local club. To find one in your area, ask a local rock
shop or post a request to this list or to the Rockhounds list.

Happy pickin,

- Brad
---------------------------------------------------------
(Also, Sue Cyr <scyr@mindspring.com> wrote: "Try joining the local
rock/gem club, You'll not only get to use the equipment but you'll
meet some of the nicest people, and have folks with many years
experience around to help you!"
---------------------------------------------------------
(Ed. Note: GOOD SUGGESTION, BRAD and SUE! And to find a club close
to your home, see the home page of Albert Zabinski, located at:
<<http://bankswith.apollotrust.com/~zabinski/>>. He has listed,
among other things, 900 clubs in the US. The listings are by State
and City, with the club name, mailing address, meeting times, meeting
location if all was available. You will find a club close to home in
this list, if one exists. (I checked his table of NC Clubs and he was
right on with them?!) If you find several clubs, check them all out.
Many clubs have their own equipment which members may use, and also
teach classes in lapidary; such a club would be the perfect solution
for you. - hale)
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<MSG4>
Date: Sun, 20 Jul 1997
From: bsmith@infodial.net

Subject: Re: Dangers of Rock Dust

Glen Kuban's message touched a chord with me concerning the dangers
of rock dust or other airborn particulates. Since starting this hobby
a year ago, I've been thinking about getting a mask, not one of the
disposable gause varieties, but a professional quality model with
replacable filter canisters. But two things have held me up; not
knowing what to protect against, and not wanting to look like a wimp
in the shop on an ill-founded hunch that the stuff is bad to breathe.

I would assume the list of damaging particulates is quite long. One
candidate I think might be added is the cutting oil in the clouds of
smoke coming from slab and trim saws. Another is the fresh-cut rock
particles that are carried by the aerosol mist from the grinding and
sanding wheels. Does anyone have any hard data about these sources?
Opinions are plentiful, but it is supported data that we need.

In particular, I'm interested in the size of the particulates so that
I can better choose a mask and filter.

- Brad
Los Angeles
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<MSG5>
Date: Sun, 20 Jul 1997
From: drewid@lanminds.com

Subject: RE: Dangers of Rock Dust


>It turns out that not only do rock particles of any composition tend to
>stay and accumulate in the lungs, but _freshly cut_ rock is the worst,
>and extremely pernicious. Even one or a few incidents of significant
>inhalation of such dust can cause lung irritation and a start process of
>increasingly serious lung damage. The microscopic particles are like
>millions of razor-edged shards that damage lung tissue directly, as well
>as create conditions promoting the development of TB, microplasms,
>fibrosis, and cancer. Experiments with rats and other animals have shown
>that inhalation of fresh cut rock dust is far more damaging than worn
>rock dust of any composition, and leads to far greater rates of several
>diseases, including pulmonary fibrosis and lung cancer.

I've heard that there is a chemical component to this problem, that it
isn't just the shapes of the rock particles that are dangerous. As I
recall, there is a reaction that occurs which converts silicon dioxide to
silicic acid as freshly-cut rock dust is hydrated in the lungs; which
greatly increases the corrosive effect experienced. Apparently, this
hydration will happen naturally as the particles are exposed to the
moisture in the air, rendering the dust less harmful some hours after it is
produced. This was supposed to account for the increase in virulence of the
fresh particles as experimentally verified above. Does anybody have any
confirmations or refutations of this theory?

Andrew Werby - United Artworks
Sculpture, Jewelry, and Other Art Stuff
http://users.lanminds.com/~drewid

(Ed. Note: Nathan Schachtman wrote a recent post to Rocks and Fossils mail list addressing this exact question concerning silicic acid, the presence of a high zeta charge of the surface of newly cut rock and the biological activity. I have just written to him asking permission to reprint it here, which I will do as soon as he replies. It is directly related to the questions which Andrew has raised. -- hale)
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<MSG6>
Date: Sun, 20 Jul 1997 10:19:00 -0700 (PDT)
To: <lapidary@mindspring.com>
From: drewid@lanminds.com
Subject: Re: Copyright

Hale wrote, in Issue 30:
<<Each author is requested to write the words
"-- non-commercial republish permission granted --" at the end of every
item submitted. This gives permission for others to use your item for
non-commercial purposes. Then clubs may legally pick up the items and
reprint them in club bulletins, and thus your words may have wider
circulation and influence. Please use those four words at the end of
each item you submit.>>

Although I sympathize to some degree with rock clubs looking to fill up
their newsletters, I am not enthusiastic about unilaterally discarding the
implied copyright that generally accompanies one's writings. What exactly
does "non-commercial" mean? Is that everything done by a non-profit entity?
Many non-profits sell various things to subsidize their efforts, and pay
their officers handsome salaries with the proceeds- if they reprint these
Digests and sell them, is that to be considered "non-commercial" use? Are
they prohibited from selling the right to reproduce the contents of their
newsletters to a commercial publishing company? What about a for-profit
company using it for a "non-commercial" purpose, like education? Text-book
publishers usually pay their authors, but in this case it seems they
wouldn't have to. Aren't reprinters allowed to edit their copy, perhaps
leaving out vital parts, or including other information? I don't have a
problem with writing for the benefit of the actual readers of this list,
who are also (presumably) contributors in their turn, but repudiating my
copyright doesn't appeal to me, in spite of the extension of my circulation
and influence. If someone wants to reprint what I've written, they can ask
me for permission; and if it seems like a worthy cause, I will grant it on
a case-by case basis.

Andrew Werby - United Artworks
Sculpture, Jewelry, and Other Art Stuff
http://users.lanminds.com/~drewid

(Ed. Reply: I purposely used the words "requested to write..." {see above}
as I certainly did not want nor intend to require anyone to give up their copyright privilege. I do think it is important that we try to help clubs fill their newsletters and giving such permission is one way to do this. I really don't think any of us will write material to this mailing list of great economic value, and thus I fail to see that any of us will really lose anything by giving such permission, and I think the benefits will far outweigh any disadvantages. But I certainly understand Andrew's reluctance, and respect his position.

I would like to hear from others how they feel about this. hale) +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=============================================================
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