A gemmy crystal of sellaite
2.1 cm long from the Huanzala mine was described by Moore (1998).
, considered to be the world's finest, is found as crystals that exceed 5 cm in size.
Finally, there was Art Soregaroli's superb sellaite
from the Huanzala mine, Huanuco province, Peru: a sharp, gemmy, colorless crystal measuring 2.1 cm.
The copper minerals are always surrounded by, and may be associated with, the alteration minerals sericite, chlorite, quartz, calcite, dolomite, fluorite, sellaite
, talc, gypsum and montmorillonite.
No fewer than 30 other halides are found there, including carobbite, sellaite
, lawrencite, scacchite, molysite and malladrite.
From the Urals, were masses of nearly pure scaly paragonite from Slyudorudnik, Vyshtym; pecoraite from Tscheremschanskoe; sonolite, alleghanyite, rhodonite, and alabandite from Inyltschek, Kyrgy; tobermorite, from Bazberovskoe; sellaite
from Suranskoe, Bashkirien; and clintonite, from Shishimskie Gory.