A Lithium Aluminum silicate with formula: LiAlSiO4 and hardness 6.5.
Always massive, rarely transparent,more often translucent like in this case here. Rarely cut a a gem it shows a moderate magenta-red fluorescence at short wave UV light sometimes in bright pink.
This gem comes from
Londonderry Li deposit (Londonderry Feldspar Quarry; Fraser's Find; Frazer's Find; Scahill's Quarry), Nepean, Coolgardie Shire, Western Australia, Australia
Size: 12.5x11.5x6.8 mm.
Weight: 4.60 ct.