What it probably is, Purple stuff? No, not fluorite.. Options

[NewRockHounder]

After doing some book research I came upon "Purpurite," based on the description provided, IE occurs as crusts, compact, granular masses, brittle, slightly powdery consistency - it 99.8% matches what I have. Why did I leave off .2%? - Because, I don't have any means, currently, to do a scratch test. Book says it will leave a dark red streak.

A ceramic tile would work for a scratch test, right? Just to remind ya's what the deuce I'm talking about, provided some pics, again. (The first pic looks different then the rest, because it's sprayed with clear coat as not to crumble.. more so than it had)

[Coalbunny]

Are you sure it's not copper? The physical description, "...it just crumbles...Super brittle...It almost feels like a chalk", tells me something. I know the fluorite I've encountered didn't feel like that. Of course I only found crystalline, not massive. Azurite is possible, as the description you give is quite similar to azurite & chalcanthite I have found. Could also be callaghanite. Lots of stuff we need to know first. can't just look at it and say "oh, it's this!", with exception for gold (usually). Though I seriously doubt it is purpurite.