Discussions

💬 Home 🔎 Search 📅 Latest

╳Discussions

💬 Home 🔎 Search 📅 Latest

Groups

Recent Images in Discussions

Identity HelpWhat is the dark green gemmy material in the center of the specimen?

3rd Jul 2012 01:36 UTCAnonymous User

Hello,

I found what I think is a Serpentine specimen a couple years ago - gemmy side down in the Rock River, downstream from the Adams Hill Nickel prospect, in southeastern Vermont. It happened to be a sunny day and I knew I had something of some significance, at least to me. So I decided to polish it with my orbital sander, working my way up with finer grits and then some automotive chrome polish. I know there is asbestos present in serpentine, so I took proper safety precautions. My question is: what is the gem-like material in the center of the specimen - when tilted, different structures (or bands) are highlighted depending on the angle of tilt - a "holographic" effect is produced. Thanks for your help:-D

3rd Jul 2012 05:05 UTCD Mike Reinke

Tim,

Can we get a larger picture, and maybe several angles? I think that would generate more responses.

Thanks.

3rd Jul 2012 22:14 UTCAnonymous User

Here are some better photos - I hope these are helpful. Thanks!

4th Jul 2012 00:07 UTCPaul Brandes 🌟 Manager

Timothy,

Have you conducted any sort of diagnostic testing yet such as hardness, streak, specific gravity, etc...? That might also give you (and us) a better idea of what you have. My initial thought is that if you used an orbital grinder to polish it, it is likely harder than just serpentine alone but is a metamorphic rock called serpentinite, which contains serpentine minerals.

6th Jul 2012 01:21 UTCAnonymous User

Dear All, After further research I've narrowed it down to Bowenite a variety of Antigorite. Thank you again. Timothy Bonura

6th Jul 2012 11:56 UTCPeter Haas

Please be aware that the various serpentine group minerals cannot be distinguished by visual means. There may be good reasons to assume that it is bowenite (you probably checked what has been published about the locality where it was found), but until it is confirmed by an appropriate analysis, it remains an assumption.

Go to top of page