Granites can be predominantly white, pink, or gray in color, depending on their mineralogy. The word granite comes from the Latin granum, a grain, in reference to the coarse-grained structure of such a holocrystalline rock.By definition, granite is an igneous rock with at least 20% quartz and up to 65% alkali feldspar by volume.ranites can be predominantly white, pink, or gray in color, depending on their mineralogy. The word granite comes from the Latin granum, a grain, in reference to the coarse-grained structure of such a holocrystalline rock.
How does electricity produce heat, and where do the electrons go? When electrons flow through a conductor it is subject to resistive loss, which has the unfortunate capability of producing heat from this current, leaving us with less current in the other end of the conductor opposite to the power source.
In its simplest form, thermoelectricity is produced when you heat one end of a wire; electrons will move to the colder end, carrying electrical charge with them and producing a current. Alternatively, you can apply a current to the wire to carry heat away from a hot section to cooler areas. Since the 1960s, NASA has used this effect to generate electricity for spacecraft too far away from the sun for solar cells to operate. And one Japanese company is even selling thermoelectric wristwatches powered by the wearers body heat. But the materials have so far been used only in novelty items because of a catch-22: to make the process efficient, you need materials that will conduct electricity, but that do not excel at conducting heat, so the temperature difference remains.