Dr. Nagy I. Zoltán szerk.: Fragmenta Mineralogica Et Palaentologica 4. 1973. (Budapest, 1973)

A and B = Albite twin (Mj) C and D = Carlsbad twin (Zjj) C and E = Roc Tourné twin (KJJ) D and E = Albite twin (MJJ) The Carlsbad twinning axis is the same in the two complexes. -II = " °*

022

90 i - O.53225 A + 0.84626 k ao -IIb = " °"

02016 I - 0.52981 i + 0.84789 k o Z

TT

„ = - 0.02264 i - O.53233 j + 0.84620 k xxc

o The bisectrix value obtained from the three vibration directions is nearly the same. The angle included by and M^j approaches the right angle most favourably by the value Z

XTo , therefore this angle will J. -Lobe used. KJJ = ZJJ X M.

Z1 = - 0.99928 i + 0.03719 1 + O.OO365 k 000 The twinning axis between the members A and C is denoted by z_: 7, = - 0.46723 i + O.75037 £ + 0.46761 k o z

b = - 0.47102 i + O.74952 A + O.46513 k o z = - 0.47298 i + 0.74703 A + 0.46714 k c

o The bisectrix of the (010) face normal of the two complexes z

M = - 0.47536 i + 0.75067 A + 0.45881 k o The values obtained from the optical vibration directions are used. Transformation is performed into the system X" Y" Z". X" = K

ZL Y" = M

II Z" = Z

IX