TITL chemdig rzepa  crystalmaker  example_cmdf                                                      
NOTE
Paragonite is a mica mineral, somewhat similar to muscovite; the two
minerals differ, however, in that paragonite contains sodium, rather
than potassium. This results in a smaller unit cell. The principal
polytype of paragonite is monoclinic, 2M1. 

At room-T, there is a very limited solid solution of paragonite in
muscovite, and of muscovite in paragonite - but the amount increases
with temperature up to about 10 and 20 percent, respectively.
Paragonite may be formed by the reaction: 

     kaolinite + albite -> paragonite + quartz + water 

it may also be formed in sedimentary low-temperature environments from
illite or montmorillonite. 

The optical properties of paragonite and muscovite are very similar,
and the two minerals can be distinguished by chemical analysis for
alkalis, or by x-ray diffraction. 

Paragonite usually occurs as fine-grained aggregates, along with other
Al-rich minerals. It is widespread in metamorphic rocks (schists,
phyllites, gneisses), mainly ranging from greenschist to the
sillimanite zone of the amphibolite facies, but it also occurs in
blueschist-facies rocks. It is found also in fine-grained sedimentary
rocks.
CELL      5.1280    8.8980   19.2870   90.0000   94.3500   90.0000
SPGR  C 2/c               
XYZR    0.1000  2.9500  0.7000  2.4500  0.8000  2.2000
MODL  3
BKCL     0.33384   0.36286   0.88153
BNCL     0.68666   0.68666   0.68666
BRAD     0.250   0.500
LTDN     0.57735   0.57735   0.57735
AREN    0.7500  0.7500  1.0000     10
BREN    0.5000  0.9000  1.0000     10
PREN    0.5000  0.9000  0.0000      1
SHCL  1
COLS  1
OMAT    -1.99   3.80  -2.80  -5.66  -5.73  -3.77 -12.27   2.46  14.68
BMAX  Si  O   1.8515
BMAX  Na  OH  2.6910
BMAX  Na  O   2.7255
BMAX  H   O   1.4490
BMAX  H   OH  1.4145
BMAX  Al  O   2.3000
BMAX  Al  OH  2.2000
TYPE
Al    0.53    0.0975  0.6774  1.0000
H     0.05    1.0000  0.6990  0.6990
Na    1.16    0.7895  0.7743  0.0000
O     1.21    1.0000  0.0000  0.0000
OH    1.18    0.7782  0.3510  0.0000
Si    0.40    0.4468  0.2835  0.9918
ATOM
Al  M(1)        0.2500    0.7500    0.0000
Al  M(2)        0.2499    0.0832    0.0000
H   H           0.8866    0.1458    0.0706
Na  Na          0.0000    0.0941    0.2500
O   O(1)        0.9574    0.4439    0.0554
O   O(2)        0.3795    0.2516    0.0554
O   O(3)        0.3739    0.0914    0.1743
O   O(4)        0.7491    0.2960    0.1628
O   O(5)        0.2475    0.3818    0.1748
OH  OH          0.9518    0.0628    0.0512
Si  T(1)        0.9258    0.4288    0.1409
Si  T(2)        0.4401    0.2578    0.1409