RA14V1: The crystals are more isolated than usual for samples from Mapimí. They are on limonite matrix and have a very intense color and luster (but with a little bit less contrast than in the photo).
The sample is with a card from the Folch collection (number 13015) that we'll send to the buyer.
Ojuela Mine, Mapimí, Municipio Mapimí, Durango  Mexico (±1980)

Specimen size: 9.3 × 6.2 × 5.2 cm = 3.66” × 2.44” × 2.05”

Main crystal size: 0.4 × 0.3 cm = 0.16” × 0.12”