Senaite crystals – 3mm
Photo by Gilles Haineault
© Gilles Haineault
Senaite, a member of the crichtonite group, is extremely rare at Mont Saint-Hilaire.
Color is usually black.
Luster is submetallic.
Diaphaneity is opaque.
Crystal System is hexagonal; 3.
Crystal Habits include sharp equant crystals to 1mm forming cyclic
Cleavage not observed.
Fracture is conchoidal.
Hardness is 6.
Specific Gravity is approximately 5.3 g/cm
Streak is black.
Associated Minerals include aegirine, albite, catapleiite and microcline.
Distinguishing Features: Crystal habit (trillings).
Origin: Named in 1898 after Joaquim Candido da Costa Sena
(1852-1919), Brazilian professor of mineralogy.
MinRec 21:334-335 (1990), Dana 8:366 (1997)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE: