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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 ...
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.
It has been suggested that chrysotile is never stable relative to either of the other two serpentine polymorphs. Samples of the oceanic crust and uppermost mantle from ocean basins document that ultramafic rocks there commonly contain abundant serpentine. Antigorite contains water in its structure, about 13 percent by weight.
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
Lizardite, chrysotile, and antigorite all have approximately the formula Mg 3 (Si 2 O 5)(OH) 4 or (Mg 2+, Fe 2+) 3 Si 2 O 5 (OH) 4, but differ in minor components and in form. [10] Accessory minerals, present in small quantities, include awaruite, other native metal minerals, and sulfide minerals. [12] Ophiolite of the Gros Morne National Park ...
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Chrysolite may refer to: . Peridot, a gem-quality olivine; Archaically, any of several green or yellow-green-coloured gemstones including Topaz, a silicate mineral of aluminium and fluorine
Seismic intensity Display; I: PEIS I (Scarcely perceptible)II: PEIS II (Slightly felt)III: PEIS III (Weak)IV: PEIS IV (Moderately strong)V: PEIS V (Strong)VI: PEIS VI (Very strong)VII ...