Minerals in the pegmatite are: quartz, microcline, muscovite, albite, amblygonite, "apatite," beryl, uraninite, elbaite, members of the tantalite group, secondary uranium minerals, triphylite, triplite, purpurite, rockbridgeite, tavorite, barbosalite, hureaulite, eosphorite, phosphosiderite, carlhintzeite, colquirite, pachnolite
, ralstonite and fluellite.
Associated minerals are: cryolite, cryolithionite, pachnolite
, weberite, thomsenolite, prosopite, ralstonite, and fluorite.
Minerals identified in the pipe are: cryolite, cryolithionite, elpasolite, pachnolite, prosopite, ralstonite, thomsenolite, weberite and a new mineral with the composition [Na.sub.2]LiAI[F.sub.6] that has been named simmonsite.
The Zapot pegmatite represents the third known occurrence of the alumino-fluoride minerals cryolite, elpasolite, pachnolite, prosopite, and ralstonite in North America.
Minerals in the younger, secondary stage include: fluorite, pachnolite, prosopite, ralstonite, thomsenolite, and weberite.
Pachnolite occurs as fine-grained, soft, snow white masses to 1 cm associated with other late-stage alumino-fluorides.
(1946) On the crystallography of thomsenolite and pachnolite
. Transactions of the Royal Society of Canada, 40, Part IV, 11-25.
The pocket contained many well-formed microcrystals of chiolite, elpasolite, thomsenolite, pachnolite and ralstonite.
The paragenetic sequence of secondary aluminum fluorides observed in the pocket is: cryolite to elpasolite and chiolite, followed by thomsenolite, pachnolite and finally ralstonite.
Peter's Dome, El Paso County, Colorado, where microcrystalline aggregates are found sparingly with pachnolite, cryolite, prosopite, thomsenolite and gearksutite in aluminum fluoride pegmatites.
Thomsenolite and pachnolite are dimorphous forms which generally occur together in cryolite solution cavities.
Bill Baltzley of the Powhatan Mining Company (Route 5, box 6065, Amelia, VA 23002) reports that additional pods of rare fluoride minerals (pachnolite
, chiolite, elpasoite, cryolite, thomsenolite, ralstonite) have been found during 1993 at the Morefield pegmatite, near Amelia.