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

1. LapDigest News for Issue No. 179 - Tues 11/24/98
2. NEW: Cabbing Picasso Marble
3. NEW: Generalizations on Epoxies
4. NEW: How Do I Cab Jade?
5. Re: Polishing Geodes on a Vibratory Lap
6. RE: Accelerant for Epoxy
7. RE: Accelerant for Epoxy
8. RE: How to Make Weights for Vibrating Flat Lap
9. FS: Tumbling and Cutting Rough
10. FS: Mexican Amethyst


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<MSG1>

Subject: LapDigest News for Issue No. 179 - Tues 11/24/98


I am pleased to tell you that the Lapidary work of Roger
Pabian is up on the website: www.lapidarydigest.com.
Stop by and see some very nice designs and work.

I have also started putting up thread files on the web site
and have 5 of them up and ready for viewing:

..How to Clamp Rocks in a saw vice.
..How to stabilize turquoise and opal.
..Selection of a proper trim saw lubricant.
..Discussion of slabbing several nodules together.
..Discussion of the dangers of rock dust to humans.

More thread files will be added as time goes on. And I want
to thank George Butts (who wrote the electroplating piece)
for the development of a computer program to bring together
the headings of topics of like subjects, which define
threads and thus allow for easy construction of thread files.
You are ingenious, George!

I want to begin putting our member's URLs up on a link page,
regardless of the content of your web pages. So would you
please send me your URLs and a brief description of your
pages? The only restriction to these pages is that you are
a member.

Have a great Thanksgiving, and take care of yourselves....

hale
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<MSG2>

Subject: NEW: Cabbing Picasso Marble


Hi fellow lapidaries

Does anyone have advice on cabbing/polishing Picasso marble,
ie, best polish etc? I will cab on Diamond flat lap
(All-U-Need). Can it be tumbled in my mini sonic vibratory
tumbler? I have some pieces that have a very high polish on
them, but don't know how it was done.

Thanks,
Sally
{sahintz@eudoramail.com}
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<MSG3>

Subject: NEW: Generalizations on Epoxies

Handling: Epoxies are formulated from various chemical
compounds. Some of these compounds can cause skin or even
respiratory sensitization. Usually , in two part epoxy
systems, part B [hardener] is the culprit. Some people are
more susceptible to the effects than others. Prolonged or
repeated exposure is also a factor. Good ventilation and
avoidance of contact are recommended, during the use of
epoxies. With proper handling, there is very little danger
of encountering any problems, and epoxies are very
versatile and useful materials.

Characteristics: Epoxies provide good adhesion, bond
strength, long term stability, and choice of quick cure or
regular cure properties. Two part epoxy systems cure
through a chemical reaction rather than by an evaporation
of a solvent component. Therefore they suffer very little
shrinkage as they cure. Generally speaking, a cure at room
temperature is recommended to minimize the formation of any
stresses as the material is "locked" into its final form.

gerald chadderdon
<flyrodman@webtv.net>
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<MSG4>

Subject: NEW: How Do I Cab Jade?


Hi fellow lapidaries:

Our assignment for stone of the month in my Houston Lap
club is (gulp)Jade (looks like spinach colored nephrite)

Anyone got advice? I heard it undercuts, so what do I do
about that?

Thanks, Sally
{sahintz@eudoramail.com}
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<MSG5>

Subject: Re: Polishing Geodes on a Vibratory Lap


Filling a geode with wax is a no-no, you will never get all
the wax out no matter how how much hot water you pour into
them and eventually one will crack on you. Try filling them
with "Knoxs Gelatin" I believe that is the right name. Its
a product that you can buy in any grocery store. It turns to
jelly when mixed with water and will set up like jelly when
left to set. Pour this into your geode when polishing. When
you are done just wash it out with warm water. It leaves no
residue & washes right out.

For polishing the insides try soaking them in diluted "Sani
Flush" 50/50 solution and water. Note do not do this if any
geodes contain Calcites

John Ratcliffe
<ratcliff@mail.ocis.net>
Kamloops, BC
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<MSG6>

Subject: RE: Accelerant for Epoxy


When I was into model railroading we used a product called
"zip kicker" it greatly accelerated the setting time of
epoxy glue.

Val
VDmad78@aol.com
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<MSG7>

Subject: RE: Accelerant for Epoxy


I have never heard of an accelerator for *epoxy* type glues.
Are you thinking of accelerators for cyanoacrylate glues,
like super glue? If so, there are a couple of companies that
make it, including the Hot Stuff line of glues carried by
Johnson Bros. F.C., Inc. in California (818-705-7400).

Another brand is Star Bond which makes an accelerator for
their glue. Both work extremely well, but the Star Bond
accelerator dries a tad slower. If you use the glue to fill
pits or cracks in stones, the slower drying accelerator is
good since it is less prone to cause bubbles to form in the
filled-in areas.

I use the NCF Mild accelerator made by the Satellite City Co.
(805-522-0062), and believe me, when you spray it on any
super glue, the glue will dry as hard as it is going to get
in about 20 seconds. It is really great when you are trying
to glue two pieces together quickly so you can continue
working on your project.

BTW, I always keep a bottle of super solvent around that
will dissolve super glue, in case I manage to glue my
fingers together or need to unglue anything else.

If you want to get some accelerant quickly, try checking
with the hobby shops, particularly ones that sell model
airplanes and such. They usually carry it.

One other use that was recently touched on in this digest
was using the heavier bodied super glue and accelerant to
glue the end cuts from rough rock onto a block of wood so
it could be placed in a saw vice. I have done this many
times, and it works like a million dollars. Just squirt a
liberal amount of glue on the surface of the stone, spray
it with accelerant, and quickly place it against the wood.
You can let go in about 20 seconds. I usually put a little
extra glue along the edge of the stone and the wood,
spray the accelerator, and stick it in the vice. You will
be amazed how well it holds.

I hope this answers your question.


Vance McCollum
Earth Relics Company
erelics@cchat.com
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<MSG8>

Subject: RE: How to Make Weights for Vibrating Flat Lap


A source for lead for casting flat lap weights may be tire
stores or shops where wheels are balanced or rebalanced.
Often weights are not reused and may be obtained for free
or low cost. When melting the weights the iron strap in
the weight will separate and easily raked aside to pour
the melt.

Howard Binkley
hbinkley@gnat.net
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<MSG9>

Subject: FS: Tumbling and Cutting Rough


I am going to extend my $1. per pound sale on tumble grade
Bruneau Jasper, Owyhee Picture Jasper, petrified wood,
Carey agate, Paisley Stone, mahogany Obsidian, and black
obsidian through the first of the year so every rockhound
can give him/herself or the favorite rockhound buddy a
present for the holidays. I am also going to run mixed
tumbling rough for $.50 per pound on 20 pound box. That way
when santa brings that tumbler to Junior there will be some
rock available that will tumble up into something nicer
than the driveway gravel that Junior is going to want to
fill the tumbler with. I am also going to sell mixed slabs
for $5. per pound. This sale is limited to the stock on
hand of course.

Dixie Reale
{dixietr@magiclink.com}
http://www.dopplerfx.com/kounting
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<MSG10>

Subject: FS: Mexican Amethyst

I have just recieved 50 lbs of agate from Mexico. It is a
dark, dark, amethyst. It appears slightly blue under
incandescant light but not under sunlight. ( I don't know
if it is my eyes or the agate. ) I am asking what I paid
for it, 6 dollars a pound + postage/shipping. I don't know
if that is a lot or not. I certainly thought it was worth
it.

It is covered with a beige rind. It is from Chihuahua and
was all that came out of the seam. Perhaps there is more,
perhaps not. I don't know. I saw some stones cut from it.
It is pretty stuff. Not purple like sugilite but pretty
darned impressive. I know one other dealer who is cussing
me up one side and down the other for beating him to it.
(Not really he and I are friends.) Contact me off line if
you are interested. Pieces run from fist sized up.

Walt
Walter Bowser
<geologo@earthlink.net>
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