Sorry for responding so late. I doesnt scratch with a penny but it does with a knife. Nothing fizzes either.
I keep my mineralogy book at work, but I'll try to remember to bring it home this week.
Bruce in CT
Madness is something rare in individuals — but in groups, parties, peoples, ages it is the rule. Friedrich Nietzsche
They have a salt industry in the Bahamas.
It looks more like a "soft" rock to me. You don't normally see quartz with that type of crystal pattern and cleavage. It looks like compressed columnar crystals.
Its not quartz if a knife scratches it. Is is soft enough to be scraped into a powder? Got a black light around?
If I can download your pics, I'll try to send it to one our expert rock guys.
"Fox terriers are born with about four times as much original sin in them as other dogs." - Jerome K. Jerome