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Metamorphic facies Reference Libraries

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Sillimanite
2005-05-25 17:30:59

Sillimanite is an alumino-sillicate mineral with the chemical formula Al2SiO5. Sillimanite is named after the American chemist B. Silliman (1779-1824). Occurrence Sillimanite is one of three alumino-sillicate polymorphs, the other two being andalusite and kyanite. A common variety of sillimanite is known as fibrolite, so named because the mineral appears like a bunch of fibres twisted...

Wollastonite
2005-05-25 10:34:25

Wollastonite is a calcium inosilicate mineral (CaSiO3) that may contain small amounts of iron, magnesium, and manganese substituting for calcium. It is usually white. It forms when impure limestone or dolostone is subjected to high temperature and pressure sometimes in the presence of silica-bearing fluids as in skarns or contact metamorphic rocks. Associated minerals include garnets,...

Word of the Day
scriggle
  • To writhe; struggle or twist about with more or less force; wriggle.
  • To scribble, jot.
The word 'scriggle' is likely an alteration of 'wiggle'.
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