what material has a dispersion of .018nm?
white sapphire
col : material | formula | refractive\nindex(es)\n589.3 nm | dispersion\n431 – 687 nm | hardness\n(mohs'\nscale) | density\n(g/cm3) | thermal\ncond. | state of\nthe art row 1 : diamond | c | 2.417 | 0.044 | 10 | 3.52 | excellent | (natural) row 2 : glasses | silica with pb, al, &/or tl | ~ 1.6 | > 0.020 | < 6 | 2.4 – 4.2 | poor | 1700 – row 3 : white sapphire | al2o3 | 1.762 – 1.770 | 0.018 | 9 | 3.97 | poor | 1900–1947 row 4 : spinel | mgo·al2o3 | 1.727 | 0.020 | 8 | ~ 3.6 | poor | 1920–1947 row 5 : rutile | tio2 | 2.62 – 2.9 | 0.33 | ~ 6 | 4.25 | poor | 1947–1955 row 6 : strontium titanate | srtio3 | 2.41 | 0.19 | 5.5 | 5.13 | poor | 1955–1970 row 7 : yag | y3al5o12 | 1.83 | 0.028 | 8.25 | 4.55 – 4.65 | poor | 1970–1975 row 8 : ggg | gd3ga5o12 | 1.97 | 0.045 | 7 | 7.02 | poor | 1973–1975 row 9 : cubic zirconia | zro2(+ rare earths) | ~ 2.2 | ~ 0.06 | ~ 8.3 | ~ 5.7 | poor | 1976 – row 10 : moissanite | sic | 2.648 – 2.691 | 0.104 | 8.5–9.25 | 3.2 | high | 1998 – row 11 : quartz | silica | 1.543 – 1.554 |  | 7- | 2.50 – 2.65 |  | ancient
what material has a dispersion of .018nm?
Material Formula Refractive\nindex(es)\n589.3 nm Dispersion\n431 – 687 nm Hardness\n(Mohs'\nscale) Density\n(g/cm3) Thermal\nCond. State of\nthe art
Diamond C 2.417 0.044 10 3.52 Excellent (Natural)
Glasses Silica with Pb, Al, &/or Tl ~ 1.6 > 0.020 < 6 2.4 – 4.2 Poor 1700 –
White Sapphire Al2O3 1.762 – 1.770 0.018 9 3.97 Poor 1900–1947
Spinel MgO·Al2O3 1.727 0.020 8 ~ 3.6 Poor 1920–1947
Rutile TiO2 2.62 – 2.9 0.33 ~ 6 4.25 Poor 1947–1955
Strontium titanate SrTiO3 2.41 0.19 5.5 5.13 Poor 1955–1970
YAG Y3Al5O12 1.83 0.028 8.25 4.55 – 4.65 Poor 1970–1975
GGG Gd3Ga5O12 1.97 0.045 7 7.02 Poor 1973–1975
Cubic Zirconia ZrO2(+ rare earths) ~ 2.2 ~ 0.06 ~ 8.3 ~ 5.7 Poor 1976 –
Moissanite SiC 2.648 – 2.691 0.104 8.5–9.25 3.2 High 1998 –
Quartz Silica 1.543 – 1.554 7- 2.50 – 2.65 Ancient
White Sapphire