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Author Topic: Beenak specimen id???  (Read 475 times)

cohen95

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Beenak specimen id???
« on: September 30, 2017, 02:50:50 PM »
Hi so recently found some pieces of this dark lustrous mineral in the hills around Beenak,
I was thinking it could possibly be black tourmaline, but the shape of the stones has really got me scratching my head!
This specimen is around 5cm in diameter

any ideas???


Findem

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Re: Beenak specimen id???
« Reply #1 on: September 30, 2017, 04:38:46 PM »
It looks like limonite-goethite to me.

cohen95

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Re: Beenak specimen id???
« Reply #2 on: September 30, 2017, 05:07:51 PM »
Interesting suggestion!
I was also thinking maybe cassiterite

Jamo

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Re: Beenak specimen id???
« Reply #3 on: September 30, 2017, 06:52:35 PM »
Have you tried doing a specific gravity test on it? This could give an indication. Tourmaline is relatively heavy

Baaa humbug, not enough fossicking time!

MakkyBrown

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Re: Beenak specimen id???
« Reply #4 on: September 30, 2017, 06:59:43 PM »
It could be petrified wood, I've seen it black/shiney like that in Tas.
We are a family of 4 from Southern Tasmania.

starsapphire78

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Re: Beenak specimen id???
« Reply #5 on: October 02, 2017, 03:22:19 PM »
Looks like Goethite to me

cohen95

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Re: Beenak specimen id???
« Reply #6 on: October 04, 2017, 03:38:00 PM »
Thanks for the input :)!
I need to get some scales and I will do a specific gravity test

darttrev68

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Re: Beenak specimen id???
« Reply #7 on: October 07, 2017, 03:49:03 PM »
The weight is the key. Very heavy - it could be cassiterite. Medium weight - probably ironstone: goethite, hematite. Relatively light - schorl tourmaline. The lustre and striated faces leads me towards tourmaline. Depends on what the geology is like around Beenak, any sign of pegmatites or granites?
Cheers, from my little piece of the Australian Outback...
For mineral samples from the Broken Hill, Olary and Mount Painter districts checkout my facebook page https://www.facebook.com/curnamonaminerals

cohen95

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Re: Beenak specimen id???
« Reply #8 on: October 07, 2017, 09:20:53 PM »
Yes both granite and pegmatite near by,
was hunting for quartz when This was found.

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