This deformation phase is defined by actinolite, chlorite and muscovite in the greenschists (Figures 3a y 3b), by hornblende in the hornblende schists (Figure 3c) and the amphibolites (Figure 3e), by chlorite, muscovite and graphite in quartz-muscovite-chlorite schists or mica schists (Figures 3h and 30, and by hornblende and anthophyllite
in the anthophyllite
schists (Figure 3j).
According to NIOSH, more than 1 million workers at 67,678 sites might be exposed to talc, tremolite and anthophyllite
Selected-area electron diffraction, which can be performed with TEM, provides information on crystalline structure, which can be of value when different fibers have similar chemical compositions, for example, anthophyllite
and tremolite, both present in small amounts, formed after the primary silicates and ore minerals.
Final decisions on imports into the Community (C(2004)1496) are thus taken in respect of: actinolite, anthophyllite
, amosite, crocidolite, tremolite and DNOC, substances recently added to the list of products subject to the procedure.
For regulatory purposes they are defined as the asbestiform varieties of chrysotile (serpentine), crocidolite (riebeckite), Amosite (cummingtonite-grunerite), anthophyllite
, tremolite and actinolite.
A naturally occurring silicate mineral, asbestos is classified in two forms: amphibole (which includes amosite, crocidolite, tremolite, anthophyllite
, and actinolite) and serpentine (also known as chrysotile).
There are several different types of ore deposits: quartz-banded iron formation (BIF); iron and copper ores with quartz and fluorite, well banded in some areas; "skarn ores" in limestones, the skarn minerals being mainly actinolite, diopside, garnet and fluorite; and finally magnetite ores with anthophyllite
, accompanied by metamorphic cordierite-anthophyllite
quartzites (Geijer, 1923).
USDOL OSHA (1989), Occupational Exposure to Asbestos, Tremolite, Anthophyllite
, and Actinolite, Current Rule 29 CFR 1910.
Amphibole minerals include five asbestos species: amosite, crocidolite, tremolite, anthophyllite
, and actinolite.
Malignant mesothelioma from neighborhood exposure to anthophyllite
This amphibole differs from members of the anthophyllite
series because it has a different space group.