Phenakite:
Eucryptite:
Willemite:
Colorless phenakite - 0.50 ct - Unknown locality
No photoluminescence with the sources: 254, 370 & 405 nm.
Gray eucryptite/albite – 1.56 ct – (Londonderry, Nepean, Coolgardie), Australia
exc 277 nm: 698 nm - Fe
3+
Very-light-yellow willemite – 0.42 ct – Franklin, New Jersey, USA
exc 254, 277, 405 and 442 nm: 525 nm - Mn
2+ replacing Zn
2+ in tetrahedral site
