JFD87AO1: The color and luster are amazing. Although not on matrix, due to the transparency, intensity of color and good definition of the crystal, I have seen few of such quality. A very old piece in my collection, I bought it from the historic Andrés Puente in 1979. Andrés was the one who had the best Áliva pieces at that time.
The specimen has been photographed and published in the magazine ‘Paragénesis’, number 01/2022, page 74
Áliva Mine (Las Mánforas Mine), Áliva mining area, Picos de Europa massif, Camaleño, Comarca Liébana, Cantabria  Spain (1979)

Specimen size: 9.6 × 4.4 × 3.4 cm = 3.78” × 1.73” × 1.34”

Main crystal size: 5.1 × 3.8 cm = 2.01” × 1.50”