Given that it is difficult to determine who is telling the truth in the recent claim that J&J covered up finding asbestos in their powder, is there any chemical test that we can perform on our own to determine with reasonable confidence whether the particular sample of powder we have bought contains asbestos? (I am aware that one test involves viewing the sample under a sufficiently high-powered polarizing light microscope, but not everyone has such a tool.)
I have not much chemistry background beyond high-school, and it seems that there are numerous kinds of asbestos, apparently characterized more by their large aspect ratio than by their chemical composition. For example, chrysotile (which accounts for ≈95% of asbestos in buildings in the US) has an idealized chemical formula Mg3(Si2O5)(OH)4, but may not even occur as exactly that. Talc according to wikipedia is either H2Mg3(SiO3)4 or Mg3Si4O10(OH)2. These break down as follows:
Chrysotile: (Mg2+)3 [Si2O5]2− ([OH]−)4
Talc A: (H+)2 (Mg2+)3 ([SiO3]2+)4
Talc B: (Mg2+)3 [Si4O10]4− ([OH]−)2
So we cannot test for Mg2+ or [OH]−. But is there a chemical test for [Si2O5]2− that can be done at home? And is it safe to rule out chrysotile if no [Si2O5]2− can be detected, or can the amount be too low for chemical detection but still dangerous?