Of the complex silicates of Zr, Nb and Ti that normally characterize agpaitic rocks, only minor amounts of elpidite are present.
The most commonly associated minerals include weloganite, cryolite, strontianite, dawsonite, celestine, elpidite, marcasite, gibbsite, quartz, hematite, goethite, siderite, fluorite, analcime, albite, baddeleyite and calcite.
Associated minerals are: quartz, orthoclase, albite, aegirine, kupletskite, elpidite
, lorenzenite, pyrochlore, monazite-(Ce), gagarinite-(Y), ralstonite, gearksutite and molybdenite.
5 cm; white chkalovite crystals to 5 cm; ivorycolored elpidite
in 15-cm clusters of sprays of acicular crystals; the world's finest eudialyte crystals, red-brown and sometimes partly gemmy, to 7 cm; sharp black ilmenite crystals to 12 cm; snappy bright black interpenetrating-cube twins of loparite-(Ce) to 1 cm; chocolate-brown lorenzenite in blocky, textbook-perfect single crystals and twins to 4 cm; narsarsukite in lustrous yellow or pink transparent crystals to 2.
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).
It appeared in the late 1960's as the green mud that collectors spent hours washing away from their epididymite and elpidite
specimens at Mont Saint-Hilaire.
Associated minerals are: (1) aegirine, albite, elpidite
, epididymite, lorenzenite, quartz, shortite, sidorenkite, natroxalate, leifite, rhodochrosite, tainiolite, pyrrhotite, sphalerite, galena, thermonatrite, trona and nahpoite; (2) aegirine, K-feldspar, elpidite
, labuntsovite, natrolite, apophyllite, fluorite, sphalerite, galena and molybdenite.
There were a few thumbnail specimens, collected by Gilles last October, of what is probably the best elpidite
found to date here or anywhere: loose 2-cm bundles of densely packed subparallel acicular crystals, flaring to rounded, glassy tops which, looked down into, are a lovely translucent grayish green.
Epididymite Epistolite Eudialyte Gaidonnayite Gmelinite Hilairite Kaolinite grp.
Penn, Oberlin, KS 67749) had tan to pinkish brown armstrongite and masses of brick-red elpidite
in matrix from Han-Bogdo in the central Gobi Desert of Mongolia; and there is still a good supply of fine realgar, orpiment, stibnite and other Chinese minerals available from the Rocksmiths, Doug Parsons (1119 S.
And, found just last fall, hence a true What's New for this show, there is elpidite
, glassy to frosty off-white acicular crystals to 6 cm long, lightly pressed together in splintery groups somewhat resembling Flux mine, Arizona, cerussite and radically prettier than elpidite
from Saint-Hilaire; these are from a pocket at Mr.
In previous years, tiny orange "lollypops" of labuntsovite epitaxial on elpidite
appeared (see Henderson, 1979).