Rocks and Minerals Question Marathon

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melissay63
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Re: Rocks and Minerals Question Marathon

Post by melissay63 » December 31st, 2012, 3:34 pm

Allinea wrote:
darkdeserthighway wrote:Can someone please explain why it's sphalerite, not citrine?
Because if you look closely, the "citirine" is actually black. Here's a different picture of sphalerite that shows the weird color:
Image
Edit: Doing a bit more reading, the black/dark color comes from the crystals containing iron. When little to no iron is present, it is colorless to yellow/orange/red.
i dont understand why you guys are talking about citrine? I thought the answer was amethyst, sphalerite, and galena...
So far...medaling has been a rollercoaster
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Re: Rocks and Minerals Question Marathon

Post by 10manwire » December 31st, 2012, 3:36 pm

Allinea was just explaining why the sphalerite was sphalerite and not citrine as darkdeserthighway was confused.
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melissay63
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Re: Rocks and Minerals Question Marathon

Post by melissay63 » December 31st, 2012, 3:37 pm

[img]http://www.mineralminers.com/images/rutilated-quartz/specimens/rtqm142-gold-rutile-in-quartz.jpg[/img]
So far...medaling has been a rollercoaster
but hopefully, next one would be on top!

melissay63
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Re: Rocks and Minerals Question Marathon

Post by melissay63 » December 31st, 2012, 3:38 pm

10manwire wrote:Allinea was just explaining why the sphalerite was sphalerite and not citrine as darkdeserthighway was confused.
got it...:D
So far...medaling has been a rollercoaster
but hopefully, next one would be on top!

wufactor2012
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Re: Rocks and Minerals Question Marathon

Post by wufactor2012 » December 31st, 2012, 4:37 pm

is it rutilated quartz (with rutile and quartz)

melissay63
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Re: Rocks and Minerals Question Marathon

Post by melissay63 » December 31st, 2012, 5:39 pm

yes but gold rutile
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Re: Rocks and Minerals Question Marathon

Post by wufactor2012 » January 1st, 2013, 7:18 am

Identify this and explain how you know and name a few varieties [img]https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcQlJ8NMxkTOtg3g_Utk1nLYC8zkoMfwP3ZLcry2SL5z2FIU52auuA[/img]

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Re: Rocks and Minerals Question Marathon

Post by zimmy1235 » January 1st, 2013, 12:39 pm

Tourmaline because of the elongate columnar crystal, varieties include schorl (this one), elbaite, dravite

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Re: Rocks and Minerals Question Marathon

Post by wufactor2012 » January 1st, 2013, 1:20 pm

sorry nope

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Re: Rocks and Minerals Question Marathon

Post by melissay63 » January 1st, 2013, 2:02 pm

Looks like hornblende to me, and hornblende is a variety of amphibole so...?
So far...medaling has been a rollercoaster
but hopefully, next one would be on top!

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