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Posted in response to Yes, another - Can You Help Identify My Rocks ? from Steve on August 04, 2007 at 01:26:14:

Re: Yes, another - Can You Help Identify My Rocks ?

My suppositions are (for where I differ or expand on your identification):

#1. Quartzite. The next step up after metamorphosis of sandstone.

#3. Quartz with hematite. Terrestial iron always seems to have some quartz in it.

#4. Amygdules in basalt are large, round or oval pockets filled with secondary mineral like zeolites or chalcedony. These are just phenocrysts or crystals in the host rock.

#5. Oh yes, Epidote. Isn't it always safe to say the black stuff in a rock is hornblende? I mean, how can anyone prove you wrong?

#6. Maybe even marble. Check hardness. Not granite. No mica. No feldspar. No grain texture to it at all.

#7. Obsidian with some pumice veins.

#8. Quartz agate is redundant. Just agate will do.

Regards,
Donald Kasper

From Donald Kasper - November 07, 2007 at 23:54:03
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Message: 65278

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