ICE has a powdered form, so why shouldn't RIME?  Here's a new element and a new property of RIME:

Diamond dust (or DIST):

No, it's not powdered DMND.  It's powdered RIME.  Like RIME, DIST can turn into FOG when sparked.  It falls differently than other powders.  It falls on the first frame, stays still on the second frame, continues to fall on the third frame, and then repeats the process again and again until it hits a surface.  This "skip-even-frames" falling is unique among elements in tpt and simulates the way real-life diamond dust floats in the air.  Like brush-spawned QRTZ, brush-spawned DIST has noise.  RIME's new property is it can be turned into DIST.  Like WOOD, RIME only breaks into it's powered form when bombarded with high-velocity particles.  DIST can also be made when WTRV is cooled rapidly, just like RIME.  The only difference is that to make DIST, the WTRV must be under pressure while being cooled rapidly.

NOTE:  in real life, diamond dust is not shaved rime like snow is shaved ice.  Instead, diamond dust is a type of snow that is formed when hot steamy air is mixed with cold sub-freezing air.

EDIT:  actually, DIST should have noise more similar to that of CRMC than that of QRTZ.