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Re: Rocks and Minerals Question Marathon
Posted: January 16th, 2012, 5:13 pm
by Infinity Flat
hexagonaria wrote:I think I saw a question earlier in the marathon like this. they said it was hematite, but it was an uncommon form
Yes, the blackish-metallic mineral is hematite. Also present is jasper (chalcedony) and tiger's eye (quartz).
The rock is called tiger iron, by the way.
Re: Rocks and Minerals Question Marathon
Posted: January 16th, 2012, 5:23 pm
by hexagonaria
I'll let Allinea go then, since he/she said chalcedony before.
Re: Rocks and Minerals Question Marathon
Posted: January 17th, 2012, 1:06 pm
by Allinea
Name the rock and what mineral causes its color.
Re: Rocks and Minerals Question Marathon
Posted: January 17th, 2012, 1:28 pm
by hexagonaria
Could it be chalk, filled with white calcite?
Re: Rocks and Minerals Question Marathon
Posted: January 17th, 2012, 2:21 pm
by Allinea
Buzzzz. Chalk is not it, I can see why though.
Re: Rocks and Minerals Question Marathon
Posted: January 17th, 2012, 3:17 pm
by tuftedtitmouse12
Limestone chalk?
Re: Rocks and Minerals Question Marathon
Posted: January 17th, 2012, 3:25 pm
by hexagonaria
Chalk, limestone chalk, same thing!
Re: Rocks and Minerals Question Marathon
Posted: January 17th, 2012, 3:27 pm
by tornado guy
Diatomite?
It looked close to another form of limestone which is slipping my mind right now.
Re: Rocks and Minerals Question Marathon
Posted: January 17th, 2012, 4:35 pm
by Allinea
ZZzzzz again. Here's a hint: look at the bottom inch or so of the image, the texture is much clear-er.
Re: Rocks and Minerals Question Marathon
Posted: January 17th, 2012, 4:43 pm
by hexagonaria
Maybe marble. All white from calcite and dolomite