pseudoleucite

pseudoleucite

[¦sü·dō′lü‚sīt]
(mineralogy)
A pseudomorph after leucite consisting of a mixture of nepheline, orthoclase, and analcime.
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Well, actually these smooth-surfaced, earthy "crystals" are pseudocrystals wherein a fine-grained orthoclase/mica mixture replaces original leucite--such alteration products, varying in composition from place to place, are loosely called "pseudoleucite." In the InnSuites I found that Jaroslav Hyrsl (Hyrsl@Kuryr.cz) had brought about ten very nice matrix specimens of this material to town, the Loucna locality having begun about three years ago to yield collector-quality specimens once again.
Hibsch (1915) recognized at least two petro-graphically different sets of lavas in the Dobranka area: (i) the lower set of nepheline to sodalite "teph-rites" with a tendency towards feldspathoidal trachyandesite (e.g., Dobranka locality), and (ii) the upper set of "leucite" tephrites (pseudoleucite).