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Talc dominantly forms from the metamorphism of magnesian minerals such as serpentine, pyroxene, amphibole, and olivine, in the presence of carbon dioxide and water. This is known as "talc carbonation" or "steatization" and produces a suite of rocks known as talc carbonates. Talc is primarily formed by hydration and carbonation by this reaction:
The mining industry defines steatite as a high-purity talc rock that is suitable for the manufacturing of, for example, insulators; the lesser grades of the mineral can be called simply "talc rock". Steatite can be used both in lumps ("block steatite", "lava steatite", "lava grade talc"), and in the ground form.
The company stopped selling talc-based baby powder in the United States and Canada in 2020 [13] and has said it will stop all talc sales worldwide by 2023, switching to a corn starch-based formula. However, Johnson & Johnson says that its talc-based baby powder does not contain asbestos and is safe to use.
(Reuters) -Johnson & Johnson must pay $15 million to a Connecticut man who alleges that he developed mesothelioma, a rare form of cancer, as a result of using the company's talc powder for decades ...
Chlorite schist is typically formed by metamorphism of ultramafic igneous rocks, [19] [20] as is talc schist. [21] Talc schist also forms from metamorphosis of talc-bearing carbonate rocks formed by hydrothermal alteration. [22] Graphite schist is uncommon but can form from metamorphosis of sedimentary beds containing abundant organic carbon. [23]
Johnson & Johnson on Thursday said it has settled two lawsuits claiming its talc products caused cancer, the first such cases to go to trial since a federal court rejected the company's plan to ...
J&J faces more than 50,000 lawsuits over talc, most by women with ovarian cancer, with a minority of the cases involving people with mesothelioma. Asbestos exposure is a known cause of mesothelioma.
Shale is formed largely from clay and is the most common of sedimentary rocks. [9] However, most clay deposits are impure. Many naturally occurring deposits include both silts and clay. Clays are distinguished from other fine-grained soils by differences in size and mineralogy.