Color -is Black to grey or brown.
Luster- is submetallic to resinous.
Transparency-crystals are translucent to opaque.
Crystal Habits include the flat, heavily modified, tabular crystals.
The crystals are elongated along the c axis and are generally flattened
in the a axis direction. Also as columnar aggregates and lamellar masses.
Cleavage is perfect in one direction parallel to the a and c axes.
Fracture is uneven.
Hardness is 4 - 4.5.
Streak is brown to black.
Associated Minerals are quartz, hematite, tourmalines, cassiterite,
micas and pyrite.
Other Characteristics: crystals striated lengthwise.
Uses- it is used in equipment that can withstand high temperatures
such as lightblubs, electrical and electronic applications because it has
the highest melting point of all metals, and remains strong at very high
temperatures.