The entire thread here is worth reading through: Grounding CBs
In general, having resin, metal and quartz is fine, especially for functional orgonite to be used outside.
Metal ideally should not be large pieces (shredded drink cans may be slightly too large, and may need additional cutting, or run through the shredder again), and benefits from having a range of sizes/densities and irregular/curled pieces - possibly due to the Casimir Effect.
Any quartz is fine, I like rose quartz and amethyst quartz and they are abundant and low cost, but any quartz will function OK.
Its important to make the distinction between what is acceptable for field orgonite, and what is optimal for personal pieces, as well as everything in-between. Don has wise words on this (from the above mentioned thread):
Meanwhile, please, please, please don’t angst over whether your orgonite is ‘good enough,’ okay? If you’re not an energy sensitive but are gifting and are following basic, simple instructions (rather than trying to compete onstage with Zubin Mehta with your fiddle) you’re not a rat, so whatever you mix up will be more than sufficient, don’t worry. Focus on your efforts’ confirmations or lack of confirmations: those are ultimately more valuable than anyone else’s specific observations.
I’ve already been getting emails from experienced giftger ‘out there’ who now wonder if their orgonite is any good, based on Kelly’s comments. Can you imagine what would happen if everyone felt their efforts had to pass muster with a single energy sensitive before they could proceed? That’s the kind of herd dynamic I’ve been fighting tooth and nail against for six years. This is why I say, ‘Put your main focus on your own confirmations!’
Most towers are OK with a couple of well-made TBs, though larger towers and groups may require HHGs and/or TBs in arrangements such as the 3 or 6 pattern. But as before, any is better than none.
A lot of this is best learnt from experience, when you have made some you’ll come to realise what works well, the main thing is starting.
