I found this small stone on a beach on the east cost of the North Island in New Zealand. It's red/brown and has almost gray spots, but also has lots of white crystals coming out of it. It has a dull shine to the whole thing but the white crystals sparkle. For it's size (I'd estimate about 3-4 cm) it seems quite heavy.
Also does anyone have any quick tips for me to help clean it up a bit?