eudidymite

eudidymite

[yü′did·ə‚mīt]
(mineralogy)
NaBeSi3O7(OH) A glassy white mineral composed of sodium beryllium silicate.
References in periodicals archive ?
This time Paul showed me flat after fiat of good specimens, mostly thumbnail and miniature size, of olmiite from the N'Chwaning mine; goshenite beryl in sharp, lustrous, doubly terminated prisms to 2 cm with black schorl crystals, from the Erongo Mountains, Namibia; attractive pale apple-green tarbuttite in intergrown crystal sheaves partly coated by chalky white skorpionite, from the Skorpion mine, Namibia; pale brown fans of very thin, bladed crystals of eudidymite to 3 cm, from Mt.
Finally, Jordi Fabre had a handful of eudidymite and epididymite specimens which, he said, were found intermittently this year and last at Mt.
Other purported eudidymite specimens turned out to be albite.
And last, but not least, was one flat of eudidymite from Malawi, the likes of which I have never seen.
Associated minerals are: aegirine, albite, analcime, ancylite-(Ce), calcite, catapleiite, dawsonite, donnayite-(Y), elpidite, epididymite, eudialyte, eudidymite, fluorite, franconite, gaidonnayite, galena, genthelvite, gmelinite, gonnardite, horvathie-(Y), kupletskite, leifite, microcline, molybdenite, narsarsukite, natrolite, nenadkevichite, petersenite-(Ce), polylithionite, pyrochlore, quartz, rhodochrosite, rutile, sabinaite, serandite, siderite, sphalerite, thomasclarkite-(Y), zircon and an unidentified Na-REE-carbonate (UK91).
5-cm floater groups of translucent white eudidymite with epitaxial epididymite, sparkly pseudomorphs of granular, dark reddish brown rhodochrosite after eudehral, 1-cm eudialyite crystals, and small thumbnails of triangular, regularly offset crystals of genthelvite--little chalky brownish gray starbursts with black aegirine needles.