“Pinkish brown panasqueiraite (or possible triplite) with quartz. Specimen not analyzed.
Collection and photo Rui Nunes, January 2005.
Note: Panasqueiraíte is a monoclinic calcium-magnesium phosphate, a hydroxyl-bearing analog to isokite (Isaacs and Peacor, 1981). At Panasqueira, its type locality, it is found intergrown in massive, fine grained accumulations with other phosphates (fluorapatite, thadeuite, wolfeite, triplite, althausite and vivianite) and with topaz, quartz and sulfides (arsenopyrite, pyrrhotite, chalcopyrite and sphalerite) in the hydrotherrmal veins. Panasqueiraíte closely resembles thadeuite and wolfeite, but the naked eye can distinguish the three species by their slightly different colors: orange-yellow for thadeuite, rose-salmon for wolfeite and rose-orange for panasqueiraíte. Crystals of panasqueiraíte are not known, but {010} cleavage surfaces are always present, as also for thadeuite (Carlos Curto Milá, Jordi Fabre: The Panasqueira Mines, The Mineralogical Record, January-February 2014, volume 45, number 1).”
Rui Nunes - 13th November 2005