Fluorapatite, LACOM 21795, OK-11d, King Fraction, Pennington, South Dakota, USA, light purple
2.572 mm, E perp c 
 2501.13,   0.10151
 2494.36,   0.09954
 2482.36,   0.10156
 2465.86,   0.10360
 2447.87,   0.10763
 2434.37,   0.11015
 2418.61,   0.11218
 2402.87,   0.11521
 2370.60,   0.11878
 2351.86,   0.12232
 2344.36,   0.12433
 2329.38,   0.12935
 2308.38,   0.13388
 2293.40,   0.13940
 2278.41,   0.14293
 2255.93,   0.14996
 2228.95,   0.15849
 2220.70,   0.16051
 2205.72,   0.16602
 2187.72,   0.16906
 2168.98,   0.17309
 2136.75,   0.18264
 2118.01,   0.18767
 2088.78,   0.19521
 2062.54,   0.20275
 2034.82,   0.21129
 1997.37,   0.22533
 1948.01,   0.23841
 1917.35,   0.24696
 1892.66,   0.25300
 1864.24,   0.26054
 1832.08,   0.26809
 1805.15,   0.27364
 1774.46,   0.27870
 1742.30,   0.28626
 1699.65,   0.29434
 1665.23,   0.30090
 1633.06,   0.30796
 1607.63,   0.31400
 1576.95,   0.31856
 1539.53,   0.32414
 1497.63,   0.33271
 1461.72,   0.34077
 1418.33,   0.34985
 1350.24,   0.36298
 1316.56,   0.36705
 1291.14,   0.37558
 1262.71,   0.38163
 1232.77,   0.38470
 1186.34,   0.38681
 1156.40,   0.39087
 1143.69,   0.39390
 1123.49,   0.39843
 1086.83,   0.40600
 1041.20,   0.41657
 1009.07,   0.42961
  974.68,   0.44165
  938.07,   0.45668
  908.17,   0.46821
  866.35,   0.49024
  830.49,   0.50627
  802.15,   0.52676
  778.25,   0.53778
  752.09,   0.54880
  717.72,   0.56333
  692.36,   0.58033
  668.49,   0.59782
  651.37,   0.61679
  640.97,   0.63176
  616.42,   0.66021
  611.26,   0.67267
  602.35,   0.68714
  591.21,   0.70261
  583.78,   0.71408
  572.62,   0.72656
  559.94,   0.73506
  545.74,   0.74157
  529.25,   0.73862
  512.74,   0.73468
  496.99,   0.72974
  478.22,   0.72282
  460.21,   0.71689
  445.23,   0.71843
  434.05,   0.72642
  426.65,   0.74238
  421.51,   0.75982
  417.12,   0.77726
  413.47,   0.79371
  408.34,   0.81314
  406.97,   0.83456
  404.82,   0.85100
  402.66,   0.86645
  397.52,   0.88289