Monoclinic cummingtonite is compositionally similar and polymorphic with orthorhombic anthophyllite, which is a much more common form of magnesium-rich amphibole, the latter being metastable.
32.
Rose Art was one of three crayon brands in which laboratories hired by the P-I found tremolite and anthophyllite asbestos in repeated tests conducted earlier this year.
33.
The upper flow facies tend to be dominated by talc, chlorite, tremolite, and other magnesian amphiboles ( anthophyllite, cummingtonite, gedrite, etc . ).
34.
In Finland anthophyllite asbestos was mined in two mines, the larger one Paakkila in the Tuusniemi commune started in 1918 and closed in 1975 due to the dust problems.
35.
"We're considering the asbestos scientifically insignificant when we compare it to the much larger amount of anthophyllite-like fibers we also found in the crayons,"
36.
Gedrite occurs in contact and medium to high grade metamorphic rocks in association with garnet, cordierite, anthophyllite, cummingtonite, sapphirine, sillimanite, kyanite, quartz, staurolite and biotite.
37.
This summer, the Consumer Product Safety Commission confirmed the P-I's findings that some crayons were contaminated with low levels of anthophyllite and tremolite, two types of asbestos fibers.
38.
"It is extremely difficult to distinguish between true anthophyllite asbestos, which the government regulates as a carcinogen, and the anthophyllite with magnesium that has been found in the talc, " he said.
39.
"It is extremely difficult to distinguish between true anthophyllite asbestos, which the government regulates as a carcinogen, and the anthophyllite with magnesium that has been found in the talc, " he said.
40.
But mine officials pointed to years of Mine Safety and Health Administration tests that failed to detect asbestos in Vanderbilt's talc, but did identify " similar-appearing fibers " called magnesio-anthophyllite.
