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Identity HelpBuergerite tourmaline?

24th Aug 2017 03:54 UTCJama Crawford

Hello

I manage public information for a nonprofit gem and mineral club. I received a request to identify this mineral. If it cannot be identified from the photo, then I have recommended to the owner to create a profile here, perform the necessary mineral identification tests, and post his picture with more detail.

But in case the mineral is obvious to the experts on this website, I am asking you as well.

The only information I have, beside the photo, is the owner of the mineral believes it is Buergerite tourmaline. I have no experience with this stone to offer an ID.

My sincere thank you for your input.

Jama Crawford

Four Corners Gem and Mineral Club

Durango CO

24th Aug 2017 04:00 UTCKevin Conroy Manager

It's definitely not buergerite, those crystals are typically bronzish-brown. These crystal look more like either epidote or maybe one of the green tourmaline species.

24th Aug 2017 04:43 UTCDoug Daniels

The crystal in the lower right end seems to show a hexagonal outline, so not likely a green tourmaline. Does he have a locality for the specimen? That is always a big help to us in "eyeballing" an ID.

24th Aug 2017 10:06 UTCErik Vercammen Expert

It makes me think of actinolite (or an other green amphibole): cross-section can greatly help to identify.

24th Aug 2017 12:13 UTCReiner Mielke Expert

Looks like tremolite to me.

24th Aug 2017 16:18 UTCJama Crawford

Thank you so much. I will forward your comments (or send this link) to the person who inquired. I greatly appreciate your expert assistance!

24th Aug 2017 16:40 UTCDonald Vaughn

Looks very similar to the Selleck Road Tremolite

24th Aug 2017 22:04 UTCScott Rider

Just an FYI, here is a link to Mindat's buergerite page. This type of tourmaline are quite rare and usually are expensive. Also, and I didn't know this until I looked closer, it appears the real name is fluor-buergerite. The second link is just for buergerite which isn't a valid species apparently!!

https://www.mindat.org/min-818.html

https://www.mindat.org/min-43560.html

24th Aug 2017 22:13 UTCAlfredo Petrov Manager

"Buergerite" is a valid species, in the sense that it was properly described and never discredited, but the name was "adjusted" to Fluor-buergerite to fit the new tourmaline nomenclature scheme.

24th Aug 2017 23:27 UTCScott Rider

Ah, thanks Alfredo for the clarffication! I was going off of what the Mindat link said about the mineral as a "not recognized as a species."

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