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"Black Amethyst"

Posted by Kristi Huggins  
Kristi Hugs October 08, 2018 08:08PM
You folks never disappoint, with either your information, or your humor! thank you for both!
Don Windeler October 09, 2018 12:02AM
> > I think some of you chaps missed it.
> > It's... Oxy More ions. :-)
> Ditch the oxy. Blackish quartz is sometimes called
> morion ;-).

Actually, given that "black amethyst" is standing in for another quartz varietal perhaps we should call it Proxy Morion...

Owen Lewis October 09, 2018 12:07AM
:-)) 'K, definite bonus point for that.
Ella December 30, 2018 03:20AM
Hello everyone,
I have recently bought a mineral that was sold as black amethyst. It’s formation is not like any amethyst or quartz I’ve seen and seeing as I am still an amateur rock collector I wanted to ask expert opinions. I have attached a photo and I hope you guys can identify it for me.

P.S. Happy New Year may 2019 be better than 2018

Apologies but that was the best I could get the picture to be.

Edited 1 time(s). Last edit at 12/30/2018 03:22AM by Ella.
Frank K. Mazdab December 30, 2018 04:57AM
I'm late to this thread, but as a mineralogist my vote goes to any of these, whichever is appropriate:

-purple quartz
-violet quartz
-really dark purple (or violet) quartz
-really really dark (so dark it almost looks black, and maybe you even need to shine a bright pinpoint light through a thin edge to see the purple or violet) quartz
-black quartz

Using amethyst (or for that matter, ruby, sericite, amazonite, alurgite, acmite, tanzanite, and countless others) may be convenient at times because some people may be more familiar with those names (and of course many of the names have a rich history). But as is evident from this thread, these varietal names tend to lack precision. Some other hypothetical and not-so-hypothetical examples:

-Is sericite simply fine-grained muscovite (if so, what's the grain size cut-off?), or does sericite need to convey a genetic connotation (and if so, what becomes of the name if the genetic interpretation of a particular locale is under debate?) Or maybe both conditions need to apply together?
-Since all non-red gem corundum is sapphire, should a brilliant green gem corundum be called an "Emerald Sapphire" for marketing purposes? Yikes!

Mindat seems to walk the line between both viewpoints, with frequent appearances in mineral lists of entries akin to "mineral X (var. Y)". Personally, given my preference above regarding "black amethyst", I could do without the "(var. Y)" addendum in an otherwise science-oriented database, and would prefer to see the color, or morphology, or impurity, or whatever feature defines the "var. Y" variety simply described as such in the photo or locality description. But as been pointed out with deep zeal and conviction on several other threads of recent, mindat of course needs to serve a diverse audience. So varietal and trade names won't be disappearing anytime soon, and indeed "emerald sapphire" may one day yet grace our pages... :-)
Keith Compton December 30, 2018 05:12AM
I still like the plain and simple description: "Quartz"
Covers all of them !! ((-:)
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