Properties: Color: Light gray. Luster: Vitreous. = b; Z 1\ c = 7°. Dispersion: r < v. 0: = 1.487(2) f3 = 1.546(2)...Space Group: P21/m. X a = 8.85(1) b = 6.63(1) c = 5.16(1) f3 = 90°25(5)' Z=2 X-ray Powder...Powder Pattern: Westvaco mine, Wyoming, USA. 2.655 (100), 3.312 (71), 8.85 (50), 2.576 (35), 1.839 (30), 3...S03 P205 Si02 C02 Al203 Fe203 MgO Na20 Cl H20- (1) 0.55 26.34 0.02 18.39 0.29 0.62 15.44 37.57 0.42...37.45 Total [100.00] 100.00 (1) John Hay, Jr. Well No.1, Wyoming, USA; recalculated to 100% after deduction |