NA13AL9: Aggregate of very sharp, colorless, transparent and shiny Stokesite crystals on a little Microcline matrix with Albite. These Stokesites, found in 1999 and featured in an article in The Mineralogical Record in 2012, are considered the best crystallized Stokesites in the world and were found in a single pocket from which very few specimens were recovered.
Isabel Quarry (La Saludadora Quarry), La Cabrera pluton, Valdemanco, Comarca Sierra de Guadarrama, Community of Madrid  Spain (1999)

Specimen size: 1 × 0.8 × 1 cm = 0.39” × 0.31” × 0.39”

Main crystal size: 0.3 × 0.2 cm = 0.12” × 0.08”