21.074 Twin Crown C

  • Strout, Edith B;Lapidary Journal, Nov 1980, p1762;
  • L/W=1.000
  • H/W=0.820
  • Vol/W^3=0.282
  • 64+8 Facets
  • Gear: 96
6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 <96> W W T T L L U U C C P P a b c d 2 3 a G1 1 2 3 4 1 2 3 4 a b c a b c d 2 3 a G1 1 2 3 4 1 2 3 4 a b c PC 21.074 Twin Crown C Strout, Edith B; Lapidary J, Nov 80, p1762 Angles for R.I. = 1.720 65 facets + 8 girdles 8-fold, mirror-image symmetry; 96 index L/W = 1.000 T/W = 0.496 U/W = 0.496 P/W = 0.597 C/W = 0.208 Vol/W³ = 0.282 pc21074.asc
G190.00°06-18-30-42-54-66-78-90 
164.71°06-18-30-42-54-66-78-90 
254.09°10-14-34-38-58-62-82-86 
351.94°10-14-34-38-58-62-82-86 
441.00°04-20-28-44-52-68-76-92 
a47.00°06-18-30-42-54-66-78-90 
b37.00°06-18-30-42-54-66-78-90 
c29.00°03-09-15-21-27-33-39-45-51-57-63-69-75-81-87-93 
d0.00°Table 

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