Phlogopite, Kimberely Mine, S. Africa, Kb5-2 of Lang Farmer (UCLA) ~0.030 mm thin section, corrected, polarized pale color 22-Jan-79 1890.70, -0.04253 1886.40, -0.03725 1881.30, -0.03688 1878.40, -0.03645 1873.30, -0.03657 1863.10, -0.03532 1849.30, -0.03367 1836.20, -0.03199 1802.90, -0.03130 1807.80, -0.02870 1802.00, -0.02834 1798.40, -0.02763 1786.80, -0.02709 1779.50, -0.02820 1763.50, -0.02869 1752.60, -0.02910 1743.20, -0.02979 1738.10, -0.03028 1731.60, -0.03075 1720.00, -0.03064 1706.20, -0.02935 1698.90, -0.02955 1694.60, -0.02932 1685.20, -0.02924 1679.40, -0.02901 1673.60, -0.02926 1665.60, -0.02970 1656.20, -0.02941 1648.20, -0.02993 1627.90, -0.02940 1622.10, -0.02946 1616.30, -0.03024 1608.40, -0.03043 1604.00, -0.03078 1591.10, -0.02948 1586.50, -0.02910 1579.50, -0.02826 1563.30, -0.02626 1550.10, -0.02410 1520.90, -0.02347 1513.30, -0.02436 1505.60, -0.02476 1499.50, -0.02547 1494.50, -0.02557 1486.50, -0.02583 1479.30, -0.02684 1475.00, -0.02700 1462.00, -0.02682 1447.40, -0.02630 1435.10, 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