This crystal would be a great one to do some elaborate wire-wrapping around or beadwoven around because of the nice flat surfaces of the host rock it sits on.
In South Africa Cactus Quartz is referred to by local tribal medicine men as "Spirit Quartz", having been used in healing rituals. Metaphysical practitioners here in the US believe Cactus Quartz has strong energy compounded by the many tiny crystals surrounding the central one, and that the stone helps in focus, group cooperation and unification, and is used to provide insight into family or community problems.
Better to be overstocked on beautiful and interesting focals than to be understocked and then have to wait for more of them to ship when you need them now for a piece in-progress. I know how frustrating it can be to need supplies and be held up on some project you're excited to complete!
If you send me a picture of your finished piece it may be featured in my blog, and/or in a treasury if you have an Etsy store.
***Shipping to US destinations will include delivery confirmation***
International shipping methods will vary depending on what's available in your country; most likely either International First Class w/Registered Mail or International Priority Small Flat Rate Box.