Rocks and Minerals Question Marathon

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Re: Rocks and Minerals Question Marathon

Post 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.
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Re: Rocks and Minerals Question Marathon

Post by hexagonaria »

I'll let Allinea go then, since he/she said chalcedony before.
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Re: Rocks and Minerals Question Marathon

Post by Allinea »

Image

Name the rock and what mineral causes its color.
2013-2014 Season: [Boyceville/Conference/River Falls/Regions/State]
WIDI[2/-/6/2/x]
Rocks[5/1/3/-/x]
Glider[13/8/x/-/x]
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Re: Rocks and Minerals Question Marathon

Post by hexagonaria »

Could it be chalk, filled with white calcite?
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Re: Rocks and Minerals Question Marathon

Post by Allinea »

Buzzzz. Chalk is not it, I can see why though. :)
2013-2014 Season: [Boyceville/Conference/River Falls/Regions/State]
WIDI[2/-/6/2/x]
Rocks[5/1/3/-/x]
Glider[13/8/x/-/x]
Rollercoaster[3/-/12/2/x]
Sustainability[12/-/7/-/-]
Exp. Design[-/3/-/-/-]
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Re: Rocks and Minerals Question Marathon

Post by tuftedtitmouse12 »

Limestone chalk?
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Re: Rocks and Minerals Question Marathon

Post by hexagonaria »

Chalk, limestone chalk, same thing! :P
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Re: Rocks and Minerals Question Marathon

Post by tornado guy »

Diatomite?

It looked close to another form of limestone which is slipping my mind right now. :?
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Re: Rocks and Minerals Question Marathon

Post by Allinea »

ZZzzzz again. Here's a hint: look at the bottom inch or so of the image, the texture is much clear-er.
2013-2014 Season: [Boyceville/Conference/River Falls/Regions/State]
WIDI[2/-/6/2/x]
Rocks[5/1/3/-/x]
Glider[13/8/x/-/x]
Rollercoaster[3/-/12/2/x]
Sustainability[12/-/7/-/-]
Exp. Design[-/3/-/-/-]
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Re: Rocks and Minerals Question Marathon

Post by hexagonaria »

Maybe marble. All white from calcite and dolomite
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