zarnith
off to a rocking start
Member since January 2013
Posts: 2
|
Post by zarnith on Jan 9, 2013 21:53:05 GMT -5
|
|
rykk
spending too much on rocks
Member since September 2011
Posts: 428 
|
Post by rykk on Jan 10, 2013 2:42:24 GMT -5
They seem to be chunks of granite. At least the two middle ones. I used to walk along the railroad tracks in search of neat rocks to tumble (at least until the cops came up and told me it was "no trespassing and even taking one 2in rock would be "stealing" - sheesh!) and picked up a lot like those. The other two may also be railbed granite, as well.
C-ya,
Rick
|
|
metalsmith
Cave Dweller 
Member since October 2012
Posts: 1,537
|
Post by metalsmith on Jan 10, 2013 13:07:10 GMT -5
Yeah, Rick is 'on-track' (sorry - couldn't resist) with that one
Looks like the first might be a crystalline limestone. Try some weak acid (such as vinegar) and look at it with a magnifying glass to see if you can see any fizzing. If it fizzes it is likely to be limestone.
|
|
