Chella is a well known town for their Jacinto de Compostela quartz. Is easy to find small double terminated red quartz (to 1 cm.) in the cultivated fields.
Working hard is possible to find crystals to 4 cm in gypsum pockets.
In the clay, too.
Jacintos de Compostela (Double terminated crystals of red quartz) in red gypsum matrix (natural) crystallized, from Chella, Valencia (Spain), Prepared in boxes.