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The following information is from the website:-
http://en.wikipedia.org/wiki/Titanite
Titanite
, or
sphene
(from the
Greek
sphenos
(σφηνώ), meaning wedge
[
4
]
), is a
calcium
titanium
nesosilicate
mineral
,
Ca
Ti
Si
O
5. Trace impurities of
iron
and
aluminium
are typically present. Also commonly present are
rare earth
metals including
cerium
and
yttrium
;
calcium
may be partly replaced by
thorium
.
[
5
]
The hardness (Mohs scale) : 5.0 - 5.5
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