120
Class IV.
Order XX.
Crystals.
Properties.
ORES OF TITANIUM.
the Pyranees *. It has been found also in Britanny
and in Cornwall.
GENUSI. OXIDES OE TITANIUM.
Sp.1. Red oxide of titanium.
Red shorl—Sagenite.
This ore has been found in Hungary, the Pyrenees,
the Alps, and in Britanny in France. It is generally
crystallized. The primitive form of its crystals, ac
cording to the observations of Mr Hauy, is a rectangu
lar prism, whose base is a square ; and the form of its
molecules is a triangular prism, whose base is a right
angled isosceles triangle, and the height is to any of the
sides of the base about the right angle as I2 to V 5,
or nearly as 3 : 21. Sometimes the crystals of tita
nium are six-sided, and sometimes four-sided prisms,
and often they are implicated together.
Colour red or brownish red. Powder brick or orange
red. Lustre 3. Transparency commonly o; sométimes
1. Texture foliated. Hardness 9. Brittle. Specific
gravity from 4.18 § to 4.2469 J. Not affected by the
mineral acids. When fused with carbonat of potass,
and diluted with water, a white powder precipitates,
heavier than the titanium employed. Before the blow
pipe it does not melt, but becomes opaque and brown.
With microcosmic salt it forms a globule of glass, which
appears black ; but its fragments are violet. With borax
it forms a deep yellow glass, with a tint of brown.
With soda it divides and mixes, but does not form a
transparent glass.
Ibid.
X Jour. de Min. No Xxxii. 614.
§ Klaprcth.
1 Jour. de Min. Xv. 28. and xxxii. 615
Vauquelin and Heeht.