RF47F8: A splendid miniature with perfect growth of the crystals, in which the faces of the rhombohedron dominate. The color and brilliance are excellent. Folch found it at the Almadén Mine in 1923.
This specimen's photo has been reviewed and published in the magazine ‘Mineralogical Record’ on page 43 in the volume 50, number 1, January-February 2019, ('Almadén!')
San Teodoro shaft, Almadén Mine, Almadén, Comarca Valle de Alcudia, Ciudad Real, Castilla-La Mancha  Spain (1923)

Specimen size: 3.1 × 2 × 1.5 cm = 1.22” × 0.79” × 0.59”

Main crystal size: 0.4 × 0.4 cm = 0.16” × 0.16”