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 (ə-pŏf′ə-līt′, ăp′ə-fĭl′īt′)
A white, pale pink, or pale green crystalline mineral, essentially KCa4Si8O20(F,OH)·8H2O.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(əˈpɒfɪˌlaɪt; ˌæpəˈfɪlaɪt)
(Minerals) 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: KCa4(Si4O10)2(OH1F).8H2O
[C19: from French, from apo- + Greek phullon leaf + -ite1; referring to its tendency to exfoliate]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(əˈpɒf əˌlaɪt, ˌæp əˈfɪl aɪt)

a hydrous potassium and calcium silicate mineral occurring in transparent crystals.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Therefore the book's chief appeal for collectors is in the slightly sad pleasure its photo gallery offers in showing us nice, aka "interesting," things now gone, or at least unavailable: specimens of Bingham Canyon apophyllite, okenite, copper, enargite, chalcopyrite, tetrahedrite, and a few others, such as we almost surely have never seen.
This body was affected by post-emplacement hydrothermal fluids and the vesicles were mostly filled with zeolites, analcime, apophyllite, and calcite (Kavka, 1965; Ulrych et al., 2000).
Other famous mineralogical locality of zeolites (natrolite, analcime, phillipsite, mesolite, thomsonite) together with apophyllite, calcite and chlorite was described by Bouska and Malec (1971) in amygdales of a basanite intrusion near Soutesky.
The most striking result was seen in the growth of lysozyme on the mineral apophyllite. In this case, the protein molecules, seeking congenial resting spots on the mineral surface, seem to settle into an orderly arrangement automatically.
On examining the main wall of the quarry, geologist Krzysztof Dembicz of Spirifer discovered some small pockets containing quartz and apophyllite. Shortly thereafter, the group found a large zone rich in minerals including laumontite, stilbite, quartz, heulandite and (the most spectacular of them all) calcite.
From the Komsomol mine: clusters of green ktenasite microcrystals; acicular tufts of white thaumasite; tabular apophyllite crystals to 5 cm, some of them water-clear or showing growth zones; transparent, rhombohedral crystals of calcite in clusters to 5 cm; white okenite "puff balls" to 6 mm; attractive clusters of orange stilbite crystals to 6 cm; clusters of attractive pink laumontite to 6 mm; and sharp, lustrous pyrite crystals on pink apophyllite-encrusted matrix to 8 cm across.
Only a handful of apophyllite specimens from the Fanwood quarry are known to exist.
The railroad tunnel, opened in 1882, provided, during its construction in the 1870s, a few specimens showing pale pink octahedral fluorite crystals with crystals of tabular white calcite, quartz, and chlorite-infused apophyllite (Parker, 1973).
Prehnite, apophyllite, calcite, hematite, heulandite and sulfides are known to form on the crystal faces.
Large and spectacular specimens of acicular natrolite in dense coatings, sprays and "nests" over matrix, the natrolite crystals sparkling with colorless, lustrous apophyllite microcrystals, were taken from pockets struck in the late 1990's in the Weyerhaeuser Lincoln Creek quarry.
Thanks to the continuing development of ever more precise analytical techniques, the Commission on New Mineral Nomenclature and Classification of the International Mineralogical Association (IMA-CNMNC) has now split many minerals into two or more "new minerals." Apophyllite thus became a group name covering the species apophyllite-(KF), apophyllite-(KOH) and apophyllite-(NaF).
Numerous dealers at this show, as at nearly all major shows these days, had superb specimens of (oh, let's see) Veracruz, Mexico amethyst; Moroccan vanadinite and cerussite; Pikes Peak, Colorado microcline (and even topaz); apophyllite, stilbite, calcite, scolecite, etc.