amphiboles

Serpentines have a sheet or layered structure where amphiboles have a chain-like structure.

Asbestos 2008

Of the amphiboles, only a few varieties have an asbestiform habit and the latter occur in relatively low quantities.

Geology of asbestos 2007

In contrast to chrysotile fibers, the atomic crystal structure of amphiboles does not inherently lead to fiber formation.

Geology of asbestos 2007

The formation of asbestiform amphiboles must result from multiple nucleation and specific growth conditions.

Geology of asbestos 2007

As with all silicate minerals, the basic building blocks of asbestos fibers are the silicate tetrahedra which may occur as double chains (Si4O11) -6, as in the amphiboles, or in sheets (Si4O10) -4, as in chrysotile.

Geology of asbestos 2007

On the other hand, both chrysotile and the amphiboles exhibit a high degree of chemical inertia towards strong alkalies over extended periods.

Geology of asbestos 2007

In this rock, you get the recrystallization and foliation of quartz, feldspars, micas, and amphiboles into alternating light - and dark-colored bands.

Metamorphic rock 2007

The chemical composition of amphiboles readily reflects the complexity of the environment in which they formed.

Geology of asbestos 2007

Mafic igneous rocks tend to be dark in color because they contain a large proportion of minerals rich in iron and magnesium (pyroxene, amphiboles, and olivine).

Igneous rock 2007

Only three varieties of amphibole fibers will be discussed because: crocidolite and amosite were the only amphiboles with significant industrial uses in recent years; tremolite, although having essentially no industrial application, may be found as a contaminant in other fibers or in other industrial minerals (e.g., chrysotile and talc).

Geology of asbestos 2007