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4220
LocalitiesWashington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
23rd Jun 2012 04:20 UTCSteve Stuart Expert
Thanks for any and all input!
Steve Stuart
23rd Jun 2012 07:14 UTCDan R. Lynch
23rd Jun 2012 08:54 UTCPeter Andresen Expert
Peter
23rd Jun 2012 09:44 UTCJohan Kjellman Expert
23rd Jun 2012 12:22 UTCSteve Stuart Expert
So, to summarize so far-
#1 could be zircon instead of garnet
#2 and #3 could be gadolinite-(Ce)
Any other suggestions?
Steve
23rd Jun 2012 16:34 UTCJohan Kjellman Expert
cheers
23rd Jun 2012 19:55 UTCSteve Stuart Expert
23rd Jun 2012 22:35 UTCBart Cannon
The lower two photos look as though they are hexagonal prisms without pyramidal terminations.
My guess is bastnaesite / fergusonite / parisite.
The dark cube like crystal in the upper photo is not like anything I've seen before from Washington Pass.
The micro mineral experts for Washington Pass are Randy Becker, Rudy Tschernich, Russell Boggs and Bob Boggs,
Perhaps I can nudge them toward this post.
Bart Cannon
23rd Jun 2012 22:44 UTCWilliam C. van Laer Expert
23rd Jun 2012 22:58 UTCKeith Wood
Zircon or Xenotime
Zircon or Xenotime
Just my guesses based on appearance only, never having collected there.
24th Jun 2012 00:31 UTCSaul Krotki Expert
various photo angles would emphasize different face shapes. In one orientation,
you have an obvious tetragonal zircon and in another, you have a zircon that may leave the
impression of an isometric garnet.
There are no garnets at Washington Pass (...a budget description for a locality.
since many of the celebrated specimens are found miles from the pass...but that
is another story.)
Gadolinite! No way! These are zircons! I have collected the most remarkably
flattened crystals in the GHB. Sent a few to Bart Cannon for ID. Yup, zircons
"that look like wulfenite," as Bart reflected!
Photos can make deceptive impressions unless the crystals are oriented in the image
to represent their species symmetry. You know...like a Dana textbook image!
24th Jun 2012 00:51 UTCBen Schumer
24th Jun 2012 01:43 UTCBart Cannon
But I stand by my opinions.
The upper photo shows a dark roughly cubic crystal, and the others are not simple tetragonal prisms. Plus the fractures and coloration are not seen in zircons from Washington Pass.
Back to the color chart project.
Bart
24th Jun 2012 01:51 UTCBart Cannon
I'm not even sure that these specimens are from Washington Pass.
Bart
24th Jun 2012 02:12 UTCSteve Stuart Expert
24th Jun 2012 03:04 UTCSteve Stuart Expert
Here is a shot down the c-axis as suggested by Saul Krotki. Tetragonal (distorted) or orthorhombic? No observable fluorescence under LW, MW or SW UV light.
Now for the bad news! My specimen now looks like a mouth with a missing tooth! In closing the micromount box , I dislodged the crystal and it is lost. There is a smaller crystal of similar habit still there, but it is not nearly a photogenic.
Merde!
Steve
24th Jun 2012 03:13 UTCBart Cannon
I shall respectfully retire from this discussion until I have the specimens in hand under my stereo-microscope.
Bart
24th Jun 2012 03:53 UTCDouglas Merson 🌟 Expert
24th Jun 2012 11:29 UTCJohan Kjellman Expert
cheers
24th Jun 2012 23:12 UTCSteve Stuart Expert
Regards,
Steve
26th Jun 2012 04:15 UTCDouglas Merson 🌟 Expert
The small black crystals on the zircon 5b have been shown to be anatase based on work by Dr. Don Howard. The whitish plate on the the prism face of 5b may be xenotime.
Doug
27th Jun 2012 00:29 UTCSteve Stuart Expert
Again, thanks for all the resposnes!
Steve
4th Jul 2012 02:23 UTCSteve Stuart Expert
A few more Washington Pass images. The last one looks like siderite coated with malachite or perhaps a chlorite group mineral. Would welcome opinions on the first two. Thanks!
Steve
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