ITS ME AGAIN MORE ROCKS...

[apprentice]

HERES SOME MORE OF MY ROCKS

 

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[Broken knee]

Your first image looks like calcite? The second one down on the left looks like a hematite nodule? The other 2, I have no idea.
HH
Broken Knee

 

[capt-zero]

I agree, the first is a form of calcite similar to silver dollar calcite. The third also may be a calcite, the crystal on the far right does appear to have a "paralellogram" shape, but you would need to do an HCL (muriatic acid) test to make sure. Another test you can try, is that calcite is the same composition as your fingernail (calcium carbonate) therefore quite soft, as such it will scratch with a steel knife blade, if it doesn't scratch, it might be quartz. Your last rock may well be a granite pegmatite with large hornblende and orthoclase crystals, but I really can't tell from the photo.

 

[capt-zero]

Here are two pictures of classic calcite shapes. The first is the basic paralellogram shape of a calcite crystal. The second is a piece of silver dollar calcite I picked up recently at an estate sale.

 

[smokeythecat]

The one on the right bottom looks like classic pegmatite minerals, quartz, feldspar and mica probably biotite in one big batch. The Appalachians are full of this in spots, same with the Rockies, not in the midwest or deep south, except for the higher parts of GA and SC, and a little in N Alabama.