The two physical properties that makes it a good mineral for use in pencils are ;
- Streakiness ( black ) and
- Texture
Graphite is used in the production of lead found in pencils. this is because of the softness ( texture ) and color ( black ) of graphite. Graphite is mixed with clay which provides the hardness required by the pencil lead.
The graphite is used because of its physical properties ( Streakiness and texture ). streakiness is the ability of lead to leave a color mark when grounded ( powder form )
Hence we can conclude that The two physical properties that makes it a good mineral for use in pencils are its Streakiness ( black ) and Texture
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