• Register

Information for users from the old Q&A site
If you have an account from our old Q&A site, your account was transferred over, but you need to reset your password and confirm your email address.
Reset Password here
Confirm Email here

2,234 questions

3,904 answers


105,683 users

Ellensburg Blue?

0 votes

Hello all, I recently purchased a large portion of a long-time rock hound's collection here in Washington State and this was among the stones.  He said he had gotten it many years ago and called it Ellensburg Agate.  Is there any way to distinguish them from other blue agates?  I'm certainly no rock expert, but this blue is hypnotizing, especially with all the pink flares in the sun.  From what google has told me everyone seems to want their stones to be Ellensburg Agates, but I would just like to know what it is either way.  Anyway, any direction on what this is would be great and appreciated!  Thanks in advance.


asked Jul 8, 2018 by EZOwens (120 points)

2 Answers

0 votes
It does not have banding like other agates. Let me do some research. it certainly resembles the images I found. Maybe if you took it to a lapidary or a jeweler they could give you a hardness, an appraisal and confirmation. I certainly like the stone. Beautiful color.
answered Jul 10, 2018 by Weasel (58,850 points)
0 votes
Ellensburg agates describe a soft-blue colored chalcedony from the Ellensburg area in Washington state. They have a color that is found to be very attractive by many people. They are not true agates, as indicated by Weasel, but rather Chalcedony. The color of the specimen you shared here certainly indicates what is known as "Ellensburg agates" - I don't know of any other location that has chalcedony with such a safe color, and judging by the geographic area of the collector whose collection you've acquired, I would say you are pretty safe calling this material "Ellensburg agate." (Though technically the name itself "Ellensburg agate is a localized varietal name that isn't recognized in the scientific area and is in fact misleading since the material is not agate but chalcedony. But we can leave this to a different discussion on another day.)
answered Oct 12, 2018 by hershel (52,780 points)