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apophyllite
[ uh-pof-uh-lahyt, ap-uh-fil-ahyt ]
noun
- a hydrous potassium and calcium silicate mineral occurring in white crystals.
apophyllite
/ əˈpɒfɪˌlaɪt; ˌæpəˈfɪlaɪt /
noun
- a white, colourless, pink, or green mineral consisting of a hydrated silicate of calcium, potassium, and fluorine in tetragonal crystalline form. It occurs in cracks in volcanic rocks. Formula: KCa 4 (Si 4 O 10 ) 2 (OH 1 F).8H 2 O
Word History and Origins
Origin of apophyllite1
Word History and Origins
Origin of apophyllite1
Example Sentences
Also some tetragonal and hexagonal crystals, e.g. apophyllite, vesuvianite, beryl, &c., which should normally be optically uniaxial, sometimes consist of several biaxial portions arranged in sectors or in a quite irregular manner.
Examples of substances which crystallize in this class are cassiterite, rutile, anatase, zircon, thorite, vesuvianite, apophyllite, phosgenite, also boron, tin, mercuric iodide.
When heated before the blowpipe, the mineral exfoliates, owing to loss of water, and on this account was named apophyllite by R.J.
Apophyllite is a mineral of secondary origin, commonly occurring, in association with other zeolites, in amygdaloidal cavities in basalt and melaphyre.
Apophyllite always occurs as distinct crystals, which belong to the tetragonal system.
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