Some older publications refer to chrysotile as a group of minerals—the three polytypes listed below, and sometimes pecoraite as well—but the 2006 recommendations of the International Mineralogical Association prefer to treat it as a single mineral with a certain variation in its naturally occurring forms.
[citation needed] Bulk chrysotile has a hardness similar to a human fingernail and is easily crumbled to fibrous strands composed of smaller bundles of fibrils.
[citation needed] Chrysotile is resistant to even strong bases (asbestos is thus stable in high pH pore water of Portland cement), but when the fibres are attacked by acids, the magnesium ions are selectively dissolved, leaving a silica skeleton.
[18][19][20] Chrysotile has been recommended for inclusion in the Rotterdam Convention on Prior Informed Consent,[21] an international treaty that restricts the global trade in hazardous materials.
Canada, a major producer of the mineral, has been harshly criticized by the Canadian Medical Association[22][23] for its opposition to including chrysotile in the convention.
[25] As of March 2024, the U.S. Environmental Protection Agency finalized regulations banning imports of chrysotile asbestos (effective immediately) due to its link to lung cancer and mesothelioma.
[26] The long phase-out period was a result of a strong lobby by Olin Corporation, a major chemical manufacturer, as well as trade groups like the U.S. Chamber of Commerce and the American Chemistry Council.
In May 1998, Canada requested consultations before the WTO and the European Commission concerning France's 1996 prohibition of the importation and sale of all forms of asbestos.
It stressed that the French measures were not discriminatory under the terms of international trade treaties, and were fully justified for public health reasons.
According to a fact sheet from 2003, "current knowledge and modern technology can successfully control the potential for health and environmental harm posed by chrysotile".