Hello.
Hope you are all having a nice day.
I'm looking for some help identifying what is on
/in and around this 5x5x3 slab of prehnite.
There is the sparkly crust over the top bubbles,
Deeper green color swirl bubbles out the side,
And my guess for the other side crusts is quarts.
The total weight is 3.67 pounds. I got a few pieces
of this among other rocks
from
A relative that passed away years ago in Paterson Nj. He was
A life long u.s.a rock hound but never wrote down what
Anything was!
I'd appreciate any help, if it's allowed in this topic;
Ideas on value would be cool. Unfortunately I'm moving
And can't take the weight of the rocks with so I'll be listing them.
Thanks. D
Impossible to say what the sparkles are without a closeup that clearly shows their shape, but a wild guess would be apophyllite ( they should have a square outline and be soft. The stuff in the last photo looks like quartz. 
Without better photo try drop of vinegar on the white "bubbles" to test for calcite. If the vinegar reacts it is most likely calcite which occurs with prehnite. Hope this helps. Thanks for the replies. I took a few close ups of the
green swirl, the white crust cover which almost looks
like beach sand close
up, and a pic of the other quartz? Pocket.
Thanks again, the help is much appreciated.
I'll still try the vinegar when I get some, curios about that lol
Actually I thought you were asking about the glassy coarse grained stuff to the right of the prehnite. The fine grained stuff to the left could very well be calcite. Thanks, would this be considered a good and or
Interesting specimen because of it's thickness of green underneath
And extra minerals on it; or is it just humdrum because
Of the coating over the green? 
Hi Star:
If he lived in Paterson, then he very likely collected this piece from the trap rock quarries in the area. Take a look at these mindat pages for more guidance.
http://www.mindat.org/loc-3954.html
particularly this one:
http://www.mindat.org/loc-5400.html
Having collected a lot of similar minerals, the light-colored crust over the prehnite looks like calcite. If so it should fizz slowly with vinegar as mentioned above. If not, then it may be quartz. I think the coarser, glassy crystals to the right of the prehnite (looks like in a layer under the prehnite) in your second posted photo are datolite.
The coating is likely making the piece less aesthetic as the green prehnite is more attractive, depending on the eye of the beholder, of course!. If it is calcite, it could be easily dissolved away with diluted hydrochloric acid. But this may etch the prehnite, making it dull and defeating the purpose. Whatever it is, it could be removed by mechanical means, but that's time consuming and could still damage the prehnite. If it were mine, I would leave it alone as there is so much of this material around that its value is not worth the effort I'd expend or damage I'd create to remove the crust. And as a geologist I find the assemblage interesting if not the most pretty. It shows the order in which minerals crystallized in this pocket - datolite first, then prehnite, then quartz or calcite.
If you have a bunch of material the relative collected, try bringing it to a local gem/mineral club meeting (check this web site for ones in your area http://www.amfed.org/efmls/ ) as it is always easier for folks to ID things in person than through photos. The clubs in Conn. where I am get unlabelled material brought in all the time and it is fun to solve these mysteries. Thank you so much for all the help/info and replies
It's much appreciated. :)
