Mystery rocks 1

[arnofarrell]

This is going to be a series of rocks that I have found or was given to me by my grandma. This one is a rock that appears to be granite? It was found in a field rock pile, in Iowa, and was found in one piece and had about an eighth of in inch crystal looking fracture that I ended up cracking to see the inside. Anyways does anyone know what it is?

 

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[arnofarrell]

Any ideas?

 

[rock]

Looks like Sugar Quartz to me

 

[arnofarrell]

I will look it up, thanks.

 

[arnofarrell]

It could be thanks again.

 

[Eu_citzen]

It surely is related to quartz in one way or another, can't tell any details from the pics so I'm not sure.
Try taking pics in daylight if you can.

 

[nomad1]

The rock in photo 3 shows signs of being heated. Note the layers of discoloration.

 

[nomad1]

Microscopic examination of a polished thin section would probably show alteration of the crystalline structure if the heating temp was high enough.

 

[Brian T. Booth]

This is going to be a series of rocks that I have found or was given to me by my grandma. This one is a rock that appears to be granite? It was found in a field rock pile, in Iowa, and was found in one piece and had about an eighth of in inch crystal looking fracture that I ended up cracking to see the inside. Anyways does anyone know what it is?

Looks to be quartz with a outer layer of weathering, with non weathered center.