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A green diopside found in Outokumpu, Finland. Diopside is a precursor of chrysotile (white asbestos) by hydrothermal alteration and magmatic differentiation; [6] it can react with hydrous solutions of magnesium and chlorine to yield chrysotile by heating at 600 °C for three days. [7]
Three polytypes of chrysotile are known. [8] These are very difficult to distinguish in hand specimens, and polarized light microscopy [6] must normally be used. 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 ...
Peridotite that has been hydrated at low temperatures is the protolith for serpentinite, which may include chrysotile asbestos (a form of serpentine) [43] and talc. [67] Layered intrusions with cumulate peridotite are typically associated with sulfide or chromite ores.
Serpentines find use in industry for several purposes, such as railway ballasts, building materials, and the asbestiform types find use as thermal and electrical insulation (chrysotile asbestos). The asbestos content can be released into the air when serpentine is excavated and if it is used as a road surface, forming a long-term health hazard ...
Peridot (/ ˈ p ɛ r ɪ ˌ d ɒ t,-ˌ d oʊ / PERR-ih-dot, -doh), sometimes called chrysolite, is a yellow-green transparent variety of olivine.Peridot is one of the few gemstones that occur in only one color.
Diopside (MgCaSi 2 O 6) → Jadeite: (NaAlSi 2 O 6 or Na(Al,Fe 3+)Si 2 O 6) [4] Diopside can be converted into Jadeite by coupled substitution; Mg 2+ 2 Al 3+ → 2 Fe 2+ Ti 4+ As in the Spinel groups [4] The site being filled to maintain charge does not have to be a substitution. It can also involve filling a site that is normally vacant in ...
The most common asbestiform mineral is chrysotile, commonly called "white asbestos", a magnesium phyllosilicate part of the serpentine group. Other asbestiform minerals include riebeckite, an amphibole whose fibrous form is known as crocidolite or "blue asbestos", and brown asbestos, a cummingtonite-grunerite solid solution series.
Lizardite contains H 2 O in excess of the nominal formula, as does chrysotile. It has a high amount of Fe 2 O 3 and a low amount of FeO. [9]: 8 One study found that lizardite has a high amount of SiO 2 and a low amount of Al 2 O 3. [10]: 193