no with
sunstone=(Na,Ca)[(Al,Si)2Si2O8] i mean a totally different stone than rutiled quartz!!!
i've looked it up in my gemguide and it also has a different name:
aventurine-feldspar/feldspath or oligoclass (or something, don't know the right spelling) from the
feldspargroup, it's totally different than the normal aventurine wich is green and from the quartzgroup: it's an orange, redbrownish stone with golden refections in it, twinklings of gold, sometimes even some reflections of rainbowcolors...
link:
http://www.rozekwarts.nl/zonnesteen.jpg
http://www.luckygemstones.com/sunstone-jewelry-sun-jewelry.htm
(i also found (in my gemstone handbook) that nefrite and obsidian are good stones for your back...)
my boyfriend has also problems with his back and uses rockcristal and sunstone and it helpes him so i hope for you too tarotlady!!!
edit:
i've been wrong: sunstone, rock cristal and rutiled quartz are all for strengthening.
for the pain there are several stones: rock cristal, hematite, magnetite and chrysocolla.
i have a page in dutch tarotlady wich is very good about healthproblems and stones and a picture so you can see how they look like:
http://home.tiscali.nl/~vonhebel/
with love,
sara.