Physical Properties of Minerals. Naming Minerals . Color Glauconite (greek: glaucos = blue-green) Other Properties, Uses Magnetite Components Chromite Places Muscovite (Moscow) People Biotite . Chemicals (And Minerals) Are Classified By Their Anions .
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Other Properties, Uses
All are Dense, Brittle, Metallic, have Cubic Crystals
Color -Sometimes Distinctive
Common Errors due to:
Mol Wt. = 22.99 (Na) + 35.45 (Cl) = 58.44
Cl: 8 at corners of unit cube shared 8 ways. 8 x 1/8=1
Cl: 6 in centers of cube face shared 2 ways, 6 x ½ = 3
4 Cl per unit cell
Na: 12 along edges shared 4 ways, 12 x ¼ = 3
Na: One in center of cell
4 Na per unit cell.
Mol. Wt of a unit cell of NaCl = 4 x 58.44 = 233.76
233.76 gm of NaCl = 6.02 x 1023 unit cells
One unit cell = 233.76 gm/ 6.02 x 1023 = 38.83 x 10-23 gm
Unit cell = .564 nm on a side
Unit cell volume = .1794 x10-27 m3 = 17.94 x10-23 cm3
Density = 38.83 x 10-23 gm/17.94 x10-23 cm3 = 2.164 gm/cm3
Textbook value: 2.16 gm/cm3
Experience And Reading