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 Post subject: Scapolite
PostPosted: Thu Aug 06, 2009 5:26 pm 
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Location: South Dakota
Just got a new scapolite crystal in today along with a few other items...pretty cool..I have a bigger one but it's not gem grade..this one i got is 95% eyeclean(has one tiny flaw at the base where it was broke off) 24cts...color looks very nice..anybody ever cut one of these before?

Sunlight
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4700K bulb
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Here it is sidelit/backlit
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Perfect termination..might cut it might not..only time will tell...
Image

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PostPosted: Thu Aug 06, 2009 5:28 pm 
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Oh J That s a nice scapolite! How much is it?

J-

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PostPosted: Thu Aug 06, 2009 5:43 pm 
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1.58 RI and 5.5-6 Moh... A little soft with distinct cleavage... If you are planning.... wait a little. When you can cut the kunzite, you are ready :P

http://www.rockhounds.com/rockshop/gem_ ... rties.html

That is really nice color. Pendent material.


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PostPosted: Thu Aug 06, 2009 6:53 pm 
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nice color, amguy!


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PostPosted: Thu Aug 06, 2009 7:04 pm 
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That's one gorgeous scap. I've cut a few little lilac pieces and a bunch of yellow, but I've yet to see a purple like that. Any idea if it's natural or if it's been treated?

I treat scapolite like quartz. The cleavage may be distinct, but I've never run afoul of it, even placing the table square on the C axis. The only issue I've ever had is some odd scratching when using a 1200 nubond to prepolish, but I haven't encountered that issue with my 3K BATT.

Here's an 8.3mm (2.61ct) asscher I cut from a nice yellow xtl I had:

Image

If you're uncertain, I'd try to get my hands on some more common yellow to practice on. I don't think you'll have an issue, but better safe than sorry. (I have a piece or two of straw colored stuff I could pop in the mail to you if you like.)

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 Post subject: re: Scapolite
PostPosted: Thu Aug 06, 2009 7:17 pm 
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Location: Royal Oak, Michigan US
Hi Amguy,
Here's a piece I cut last year.
Image

Looks more yellow in the photo, as it is really more golden in the hand. I've cut a fair bit of Scapolite. The cleavage has not caused any problems, and I would say the hardness *feels* higher than 5-1/2 to 6. It cuts more like Tanzanite or Peridot than say.... fire Opal, Sphene or Chrome Diopside.

Also, the GIA charts list the RI as more in the 1.55/1.56 range. Have used culet angles in the 41* to 43* range. The 43* producing a richer color with slightly less flash than the 41*.

If you want to enrich the tonal range of the color, try using step or trap cut style of faceting. For polish, like most materials, 50K or higher diamond on BATT will work, but you will get awesome results with Cerium or Alumina Oxide on your favorite lap.... Darkside, Lightning Lap, Pol-A-Gem, Tin and others.

Hope you find this a little helpful.

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PostPosted: Thu Aug 06, 2009 11:33 pm 
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Thanks peter..I will take you up on that offer sometime...maybe a trade or something...i will cut this stone but it won't be anytime soon...I just dopped my first stone last night..took 4 tries but i got it good and solid now..I will be putting my first facet/cut on it tomorrow..oh and the stone i am cutting/faceting first is an amethyst..of course
That is a beautiful stone, Roger..i am fond of golden colors...i am ordering 2 batt laps this weekend so i will mark this thread for future reference..any other info greatly appreciated

These are from a very reputable mineral dealer out of new york who mostly deals high-end stuff so i am pretty sure there is no treatments or he wouldn't mees with thm but you never know i am not sure if they are treated or not

here is the other crystal i already had..it's specimen quality..pretty chewed up on the inside so not really good for cutting..maybe a small stone or two but real small 10 grams
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PostPosted: Fri Aug 07, 2009 2:51 am 
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I facet some myself, but some are clearly best left as specimens, or included, as the case may be.

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PostPosted: Fri Aug 07, 2009 3:19 pm 
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amethystguy wrote:
...I just dopped my first stone last night..took 4 tries but i got it good and solid now..I will be putting my first facet/cut on it tomorrow..oh and the stone i am cutting/faceting first is an amethyst..of course


8) looking forward to seeing photographs of your ammy tomorrow, amguy!!

lovely faceted yellow scapolite stones, roger and peter!! :D


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