Nice...

[bryantpau]

http://two.flash-gear.com/npuz/puz.php?c=v&id=3108859&k=61628499

http://two.flash-gear.com/npuz/puz.php?c=v&id=3108860&k=87976534

http://two.flash-gear.com/npuz/puz.php?c=v&id=3108862&k=65712954

[Dean]

Where is gneiss on Mohs Scale? Need a fingernail scratch test.

[bryantpau]

Sorry Dean, but I did a google on this (as your wisdom was completely wasted on me), and I hate to tell you (with absolutely no authority) but:

Gneiss is a rock composed of minerals of varying Mohs hardness and therefore would not have a specific Mohs hardness.

Not saying that you ain't hard; maybe just that it is hardness that is immeasurable!!

Here are some with which you can do some more hardness testing right now...

http://five.flash-gear.com/npuz/puz.php?c=v&id=4302742&k=65333098

http://five.flash-gear.com/npuz/puz.php?c=v&id=4302743&k=28399153

http://five.flash-gear.com/npuz/puz.php?c=v&id=4302744&k=68910998