I'm a newbie rockhound having recently moved to Miami Arizona. I found this rock in Globe AZ. It's very hard. The porous side a file will hardly touch. It's approx. 6" x 4" x 4". Any help as to it's nature and value is very much appreciated. thanks
Call me crazy, but if you can find out what that white material is and find a way to remove it if possible, you might have some crystal points under that white mess...I'd be curious to see if they look like citrine points...anyone else think that might be just calcium deposit coating crystal points? I can't imagine it would be calcite. If the hard stuff is in fact silicate/chalcedony, you should be able to safely soak the whole thing in iron-out or something of the like to loosen up or remove the white stuff. I would make sure to ID the white first somehow
It is basically a variety of gem quartz. Quartz is SiO2, silicon dioxide, one of the most common elements on earth. NOW>>>>>you have a gorgeous piece of agate and/or chalcedony. Both are the same essentially - silicon dioxide. The type you have people make into jewelry, cabochons. You have a might nice find there. I wouldn't touch it, just display as is.
Thank you for your input. I agree, I will be careful to maintain the rock's integrity. It's value to me right now is in its uniqueness. I intend to try and discover how unique it is. I'm hoping the process will teach me more about earth science.