Titanite (sphene)

Physical Properties
Chemical formula CaTiSiO5
Class Nesosilicate
Isolated tetrahedra
Crystal system Monoclinic
Habit Spheroidal crystals
Tabular
Massive
Lamellar
Normally fine grained;
occasionally occurs as fine crystals
Color Grey
Black
Brown
Greenish yellow
Hardness 5 to 5.5
Specific gravity 3.50
Cleavage Good prismatic {110}
Poor (100)
Fracture Uneven
Luster Adamantine
Transparency Transparent to translucent
Streak White
Optical Properties
PPL Very high relief
XPL Very high relief
High 5th to low 6th order colors
δ 0.15
after Perkins, 347-348

Titanite in Hand Sample

Titanite in hand sample

Titanite in Thin Section

Stay tuned!

Further Reading

Titanite at webmineral.com

Titanite at mindat.org