Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 82. (Budapest 1990)

Papp, G.: A review of the multi-layer lizardite polytypes

Table 1. 12 "standard" serpentine polytypes of BAILEY (1969)(after WICKS & WHITTAKER 1975), r=rotation Space group Number of per unit layers cell Interlayer shift Polytype symbol Group symbol Cm 1 a/3 1M Cç 2 a/3 2M A P3

1 3 a/3 3T Ccm2 ^ 2 a/3 + r 20r P2

1 2 a/3 + r = 20r • Cç 2 a/3 + r 2M

2 • P6, c 1 or 5 6 a_/3 + r 6

äi P31m ' 1 _ IT R3 3 b/3 3T C P31c 2 b/3 21 P 6-^cm 2 r 2H

X P6 2 b/3 + r 2H

2 D R3c 6 b/3 + r 6R Table 3. X-ray diffractogram data of "type 6(3) material" from Tracy Mine (BAILEY & TYLER 1960) and "pseudo-thçee-layer" Al-lizardite from Zalahaláp (PAPP 1988). Indices are based on 6-layer hexagonal unit cells Tracy Mine Zalahaláp Tracy Mine Zalahaláp obs I d obs I hki d obs I d obs I hkl 7.12 100 7 .30 100 006 2 . 001 40 2 . 026 12 11.14 4.59 30 4 .59 22 010 1 .93 5 <5 11.15 4.48 30 012 1 .882 15 1 . 904 4 11.16 4.21 35 4 .28 <1 013 1 . 872 2 3.85 20 3 . 90 3 014 1 .839 <5 02.14 3.56 80 3 . 65 68 00.12 1 . 81 <1 3.48 5 018 1 . 775 5 1 .793 5 11 .18 3.12 10 019 " 1 .735 10 1 . 7431 120 2.810 10 01.10 1 . 717 <5 1 .721) 2 124 2.631 40 2 .646 20 112 1 .687 <5 126 2.576 35 2 . 586 10 114 1 .662 35 1 .689 7 11.20 2.487 15 2 .501 35 116 1 .565 20 1 . 60) 12.12 2.379 90 2 .397 40 118 1 .59] <1 2.298 <5 020 1 .532 55 1 . 537 36 030 2.253 20 2 .279 3 11.10 1 .498 20 1 .505 18 036 2.127 <5 2 .152 10 11 . 12 1 .421 <5 1 .43 2 00.30 2 . 09 1 1 .406 15 1 .417 6 03.12