Sections
Thumbnails

Senaite crystals - click for larger pic
Senaite crystals - 3mm
Photo by Gilles Haineault
© Gilles Haineault

Search this site

Powered by FreeFind

Home > Mineral Descriptions > Senaite - (1 Photo)



Senaite
Pb(Ti,Fe,Mn)21O38

     Senaite, a member of the crichtonite group, is extremely rare at Mont Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color is usually black.
Luster is submetallic.
Diaphaneity is opaque.
Crystal System is hexagonal; R3.
Crystal Habits include sharp equant crystals to 1mm forming cyclic
   twins (trillings).
Cleavage not observed.
Fracture is conchoidal.
Hardness is 6.
Specific Gravity is approximately 5.3 g/cm3.
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.

CLASSIFICATION:

Dana System
# 8.5.1.4

Strunz Classification
# IV/C.09-80

REFERENCES:
MinRec 21:334-335 (1990), Dana 8:366 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
¤¤

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
--

FR
--

Legend