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Identity HelpHead scratcher

16th Nov 2018 17:46 UTCLogan Miller

Hello Mindat Community.

I’m not exactly sure what this mineral is, and am hoping that someone out there can help me figure it out.

Color - appears to be green

Hardness - 2.5-3

No streak

It feels greasy

Will not fizz in acid

If there’s other things you want me to look for just let me know. I’m not sure where it’s from.

16th Nov 2018 18:17 UTCReiner Mielke Expert

What is the specific gravity of it and where did you find it?

16th Nov 2018 18:21 UTCLogan Miller

I don’t have a means of testing specific gravity.

It was given to me by a professor for identification, so I’m not sure where it’s from.

16th Nov 2018 18:42 UTCReiner Mielke Expert

All you need is a digital scale good to +/- 0.1gm to determine specific gravity.

16th Nov 2018 19:29 UTCJeff Weissman Expert

The appearance suggests spodumene, but really need the SG for a starting point. A flame test might be useful also.

16th Nov 2018 19:59 UTCKevin Conroy Manager

You mention that this was "given to me by a professor for identification". As with the "help please" specimen, is this part of a lab or test assignment that you were given? If so, I'll certainly help you with suggestions to help you arrive at an answer, but if you're looking for someone to just give you the answer then I'm out.

16th Nov 2018 20:19 UTCPaul Brandes 🌟 Manager

If the hardness test was done correctly, spodumene is much harder than a 2.5-3.

Being that it's on the soft side, greasy, and greenish colour may indicate some sort of serpentine group mineral.

16th Nov 2018 20:33 UTCMatt Neuzil Expert

To me it reminds me much of nepheline. My classes we always did a specific group of silicates to study each week. Only on the final exam did we have all minerals together. Is there a specific group of minerals be it carbonates, oxide, silicates (tectosilicate, phyllosilicate, nesosilicate etc)

16th Nov 2018 21:28 UTCDoug Daniels

Can't say I see any cleavage on the specimen. And the table the specimen is sitting on looks like those in a general geology lab manual. If so, there aren't many choices, and would depend on what minerals the author(s) included in their tables. Certainly your prof wouldn't give you something not listed in those tables.

16th Nov 2018 22:10 UTCPavel Kartashov Manager

Serpentine.

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