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This list digest contains the following message subjects:

1. LapDigest News for Issue No. 48 - Sun 8/17/97
2. NEW: Polishing Amber
3. NEW: Blue Tiger Eye
4. RE: Polishing and Dying Geodes and Agates
5. WTB: Rich's Rock Polisher


Subject: LapDigest News for Issue No. 48 - Sun 8/17/97
In the last issue, I noted that I had asked Vince King to
write an answer to the general question of how to color or
dye rock slabs, which he did, and which was published.
I was giving his URL so members could see the interesting
work he does in producing inclusions in agate. Unfortunately,
I ommited his URL, so I give it below. Vince produces
'Fischerstone', as he explains in <>>. Take a
look! I think you will find it interesting.

I am going to the mountains tomorrow (Aug 18) to study Opal
Cutting. Thank goodness!! It is 99 degrees F here today and
I look forward to cooler climes! So there will be no issues
of the Digest published between now and Monday August 25th,
when LapDigest will resume publication - if there are
queries and responses here then. So send in any lapidary
questions you have, or answers to past questions, and we
will be back in a week!

I will leave the list serv computer on, so files will
available for downloading during that time (unless Win95 has
another of it's famous 'fatal errors'). The INDEX has been
updated to include every item from all 47 of the issues.

And our membership is now over 350. I hope we can keep up a
quality mail list to justify that number!!

Stay good! Stay safe! See ya next week!!


Subject: NEW: Polishing Amber

I would like to pose a question to the members of Lapidary
Digest. I am interested in polishing some amber and I
would like to know what is the best way to do it to produce
no damage and the most lustre. Appreciate any help.

Sylvia Grant

Subject: NEW: Blue Tiger Eye

There was an interesting thread over on Rocks-and-Fossils
mail list, about blue Tiger Eye, with submissions by Dave
Daigle, Carol Bova, Claus < > and Mark
Liccinci. It is summarized below.

Apparently blue and brown Tiger Eye are natural: blue Tiger
Eye is a greyish blue silicified Crocidolite, and brown
Tiger Eye is the same , but partially altered to include
some Limonite. Red Tiger Eye is made by heat treating brown
Tiger Eye, by burying slabs of low grade material in sand,
and cooking in an oven. Presumably, this converts some of
the Limonite into Hematite.

So some blue Tiger Eye is natural, but the color could have
been helped along by dyeing. If the color looks unnatural,
it was probably dyed. If you look at the slab under
magnification, dyed slabs will usually show concentrations
of the dyes between fibers and at ends. Dyed slabs should
be kept out of sunlight and away from solvents.


Subject: RE: Polishing and Dying Geodes and Agates

dear mark...

I am sorry, but I feel that the extremely un-natural colors
created by staining (dyeing..whatever) are an insult to the
initial beauty of the is both unappealing and a
downright shame..of course this is one man's opinion, but
almost everyone in our club has the same feeling...dyed
stones are ignored..they are not natural........

There are so many beautiful Naturally colored stones...why
do this??? It is so obviously phoney, much the same as heat
treating Tiger-eye to create the red variety.

Sorry, but I cannot agree that there is a reason for doing
this other than "because it can be done"

Jeff Ursillo

Subject: WTB: Rich's Rock Polisher

>Do any of you have a Rock "Bull Wheel"? Do any of you have
>a Richardson Ranch polishing machine? If so, please send me
>a note telling me so, and tell me what you do with these
>two machines. Send the note to the address on the masthead
>of this Digest. Thanks, and will be picking your brains
>about these machines later.

Let me toss a new element into this discussion. I want to
buy (new or used) a Rich's Rock Polisher, which used to be
manufactured by Rich's Lapidary & Supply in Portland, OR.
(Could this be the elusive Richardson Ranch Polishing
Machine?) If anyone has one to sell, contact me off-list.

This simple outfit featured an arbor with a large (12-inch
or so) buff on one side and a pulley about the same size on
the other side. It generated some serious torque and made
polishing large pieces pretty simple! I met the seller at
several shows and he used to sell a special polishing mix
with the machine that really worked wonders.

I tried calling the Portland number from an old ad recently
and was greeted by a very puzzled young man who didn't speak
lapidary. Anyhow, since I'm in the market and Rich's sounds
a lot like Richardson's.....

Rick Martin

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