It was dug up in sandy soil while planting a tree on Long Island. it weighs 236 grams and measures approximately 7x6x5 cm. the colors range from very dark blue to light blue to grey with splashes of red and champagne. My understanding of quartz is that it has well-defined crystals that grow outward, in a somewhat radiating fashion like spikes. it has no cleavage between crystals. it is brittle with conchoidal fracture. i cannot see how the warped, blebby, amorphous crystals which weld to each other in this rock can have any likeness to quartz crystal habit. if you'd want to be more precise, then you should use the term silicon dioxide SiO2 rather than quartz. quartz is a misnomer for so many mineral assemblages. incidentally, the pinkish material on left side of the rock might be quartz polymorph coesite perhaps. from what i have researched, there is only one mineral that can take on any morphology - diamond. look at the light colored champagne blebs on the lower portion of the rock, as well as most everywhere else top to bottom. i have seen many images of diamond rough posted online that look very characteristically similar to this specimen. pegmatite is a granitic mass of many jumbled widely varying mineral content and usually found as massive slabs. i have a very thin sheet of mica which is very brittle and has a rather dull sheen. where is feldspar in this rock? probably other replies henceforth will pose the question "then why do you ask us for help IDing this rock?" i guess i just want to see what people have to say.... forgive me for the length of this reply...
i have other minerals i'd like to share here as well.... thank you.
