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This list digest contains the following message subjects:

1. LapDigest News for Issue No. 80 - Wed 11/5/97
2. NEW: Mud or Drop Saw Plans
3. NEW: Ultrasonic Drilling
4. NEW: Home-made Lapidary Equipment
5. RE: Apache Tears
6. RE: Apache Tears
7. SHOW: OPLC Gem & Mineral Show


Subject: LapDigest News for Issue No. 80 - Wed 11/5/97

Received a message from <>, who sells
trilobites and other fossils from Russia. Their web page is
<>, for
anyone interested.

In the last issue, I listed several areas or topics being
worked on for future issues. I omitted one - how to make
channelwork. If you had any questions on any of these, or
any contributions about any of these, please send
them in and I will publish all items for a single topic
together. The topics are:

. doublets and triplets
. synthetic diamonds and diamond tool making
. ammonites
. mud saws
. rebuilding old lapidary machines
. polishing with diamond
. how to do channelwork

If you have suggestions for other topics, please send them


Subject: NEW: Mud or Drop Saw Plans

I saw your post to the forge list. I have a small art bronze
foundry and I am learning the ins and outs of stone cutting
for base material. Do you have available or know of a source
of plans for either a mud saw or a drop saw or both? Is your
list open for interested folks on the net? If so,could I get
on? Do you have a web page?

John and Cynthia/MidLife Crisis Enterprises

PO Bx 44, Philo CA 95466
Ph 707-895-2635 FAX 707-895-9332
(Ed. Note: I answered your last three questions in a note
sent directly to you; perhaps members of the list can answer
the question about plans for a drop saw or a mud saw. The
Lapidary Journal Index lists the following past five articles
on mud saws:

Building a Giant Saw - 63:09:654
Constructing a "Mud Saw" - 83:12:1352
How I Made Do - 76:10:1782
Mud Saw - 76:07:1048
Slow Does It With Big Mud Saw on Petrified Wood - 64:05:331

Under 'Saws, How to Make" we find five articles:

How to Build a 20-inch Rock Saw - 78:09:1310
How to Construct a Large Drag Saw - 72:05:435
How to Make a Grit Saw at a Cost of Only $2.50 - 60:06:194
A Saw for Big Jade - 62:06:367
Sawing Large Sections with a Wire Saw - 56:10:324

The numbers refer to year, month, page. Thus 64:05:331 was
published in May (05) 1964 beginning on page 331. All of
these are available as reprints; see the file
"LJReprints.txt" in Archives on how to order reprints. hale)

Subject: NEW: Ultrasonic Drilling

Bonjour Hale,

Sorry not to contact you earlier but those last months have
been very busy. As part time student at the university, self
employee (as gem dealer and appraiser in gemmology),
lapidarist, and a father, some time the days are too short. I
am working my memoir on the moonstones from Meethiyagoda. (If
you are interested, I'll mail it when I finish it).

Actually, I am looking for information on ultrasonic drilling.
I am looking for information to purchase some tools to make
holes (from 1 mm to 3 mm)in gemstones. Can you advise me about
some equipment and do you know someone who have experience in

Also, I did a database on Access concerning the articles
published in Gems & Gemology, Journal of Gemmology of G.B and
the Australian Gemmologist. I have about more than 1.000
articles. If someone needs info, I can mail the bibliography
(soon I can).

Best Regards,

Luc Genot
(Ed. Note: This is an area I know nothing about. I hope some
of you have knowledge of ultrasonic drilling and can help.
Reply to the list, and we can all learn something! hale)

Subject: NEW: Home-made Lapidary Equipment

Cate Harrison posted the following note on Rockhounds Mail
List on 11/2/97:

Hi folks,
I have posted at my site a series of articles I wrote
detailing how I have built a rock tumbler and two different
all-in-one cabbing machines. Some of you may have read these
articles when they first appeared on the Eclectic Lapidary.
Anyway, these articles now have a permanent home at my site

Follow the Link that says "Low-Budget Lapidary" to find the
how-to articles and a Arkansas quartz and diamond mining trip
report I wrote.

Cate Harrison, Aragon Gems
Fine Facet Rough See our pretty pictures!

Subject: RE: Apache Tears

LKusher@AOL.Com asked:

<<I have some good sized apache tears, clear and nice. I cut
the end off one about 2cm round to make a cab. It works like
quartz and takes a shine with tin oxide. What is the material?
Is it a quartz with no crystal structure or what? >> [79-2]

Apache Tears are obsidian (volcanic glass). In addition to
cabs, a lot are tumbled, and, I have one that I faceted a
number of years ago, and a lot of people think it is smoky

I usually polish them with cerium oxide.

Earl English

non-commercial republish permission granted

Subject: RE: Apache Tears

Apache tears are obsidian. That's a volcanic glass. Softer
than quartz. The glass itself though, is high silica, so
quartz could be said to be a large part of the composition,
but only in the sense that the chemicals are in there, along
with others. The exact formula is highly variable. As with
all glasses, it's an amorphous mix, and technically speaking,
not a true solid, but a very viscous liquid. What happens
with apache tears is that with weathering and aging, some of
the glass starts to actually crystalize out as it's componant
minerals. This occurs forming vein and seamlike structures,
forming a honeycombed sort of thing that can then break apart
along those devitrified seams. Thats what forms the chunks
that, after stream tumbling and erosion, become apache tears.

Peter Rowe

Subject: SHOW: OPLC Gem & Mineral Show

Greetings from Tucson.

If any of you folks happen to be in southern Arizona this
weekend you should come by and enjoy the Old Pueblo Lapidary
Club's Annual Gem and Mineral Show.

The show will run Friday and Saturday (10 AM-6 PM) through
Sunday (10 AM-5 PM). Admission is $2, but bring a badge that
says "Ask me about the Lapidary Digest" and it costs you only

To get there take I-10 east of town to the Houghton Rd. exit,
then go south and follow the signs to the Pima County
Fairgrounds. We will be in Thurber Hall.

There will be demonstrations of many of the Lapidary and
Jewelry arts including cabbing and faceting. If you see a
fellow working on an Ultratec and trying to get his points to
meet, that'll be me. Stop by and say howdy.

Rob Kulakofsky / ColorWright

non-commercial republish permission granted
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