Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
7
1
1999
4
1
Mineralogy, Chemical Compusitiun a nd Industrial use of
f eld spars from Ma shhad and in Comparison with oth er
fe ldspar Depus its in Iran
3
14
FA
Y
N
Milshhad ~fani l c and l!,funodinrilcs arc inlfUlkd in
th ree different period between Triass ic to Lue JU fllssic.
Muscovi te- biotitl! gr:tn itc and pegmatill!s (the you nge ls)
arc exposed be tween Khal adgc ,md Khaj c h Mourad area.
Alkali fe ld spars within pegmatite d ykes. between
G hcshlagh, iloll Khladgc, we re sludit!d in detai l inclucJing
l}rC rese rve es ti mation. mineralogy. chemical composition.
and industrial uses. Fddspar in the Gheshlagh area is K-rich
type (K20>%9 and Na.p< %2). While in Kbajch Moufild
lIrC<I. hoth types of K lind NlI -rich fe ldspa rs arc recognized,
"'~ Ghcshlagh feldspar L'i suitable for ceramic body and the
N,Hich type I:rom Khajeh Mourad is applicable in glass and
as filler in paint and rubber industries.
Alkali feldspar, Albi", K-fc/dspar, Cemmics, Glass.
Abstract: Milshhad
http://ijcm.ir/article-1-863-en.html
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Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
7
1
1999
4
1
Software Development for
Crystal Structure Determination
15
32
FA
Y
N
A software in fortran is developed to determine
crystal structure of cubic. tetragonal. hexago nal and
orthorhombic crystals from powder ditTraction d values. The
general 1t6s method is also used for triclinic and monoclinic
crystals.
Crysflll Srruerure, Triclinie, Monoclinic, Orrllorlwmbic, Tetragonal,
Hcragonlll, Cubic
http://ijcm.ir/article-1-864-en.html
http://ijcm.ir/article-1-864-en.pdf
Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
7
1
1999
4
1
Distinction of dolomites based on texture
in the Middle Jurassic carhnnate rocks
of Northeast Mashhad
33
44
FA
Y
N
N
The Mozduran One Formation (Middle Jura~!;ic )
in NE Ma!;hhad is mainly composed o f dolomite and limestone.
Based on texture (size and fabri c), dolomites were divided into
5 diITerent types with a crystal size which ranges from 10 to
1200 microns. Type one is very fine tn fine subhedral to
euhedral crystals. while type two is fine to medium euhedral
with poikilotopic texture. Type three is medium planar
suhhedralto anhedral crystals with idintopic texture. Type four
is medium to coarse anhedral nonpianar crystals and type five
is coarse with dolomite cement. Distinction between types 3
and ,1 is difficuil and is mainly based on the larger number of
crystal hthliidries in type three and stronger undulose
extinction in type four. Dolomite.'I of types nne to three are
mainly formed in the early stages. while types 4 and 5 formed
during the burial. in the late stages of the diagenetic history of
the rock. It is concluded that ba'led on texture. dolomites can
be divided into different types and thereby the ir origin can be
interpreted.
Dolomite. Texture, Mozdurall, Kopet-Dagh
http://ijcm.ir/article-1-865-en.html
http://ijcm.ir/article-1-865-en.pdf
Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
7
1
1999
4
1
Molecular Structure determination of
Trimethy l ~ . (benzoylmethyl)l benzyl Silane
45
54
FA
Y
N
N
The Crystal Structure of I <It • (bcnzoylmc thyl)
benzyll Silane (CH3h Si CH (C(> H ~ )CH2 COC(>Hs has been
determined by direct method (Sir). The dimensions of used
cry:,tal were 0.7 x 0.3 x 0.2 mm. TIle molecular structure has
been determined by MolEN program. This compound
crystalizc.s in monoclinic space group P2t /n (14) with four
molecules per unit cell. Lattice parameters of this
compound an.:: :
a = 6.0938 A. h = 22.8465 A. c = 12.0533 A. p= 92.0605'
Afll.::r lasl least· square cycle, lht.! final R anJ R.,... values are
0.087 and 0.093 , re.spectively.
benzoyl methyl, benzyl. Silane. Crystal Structure
http://ijcm.ir/article-1-866-en.html
http://ijcm.ir/article-1-866-en.pdf
Iranian Socity of Crystallography and Mineralogy
Iranian Journal of Crystallography and Mineralogy
1726-3689
2588-4719
7
1
1999
4
1
Application of Oxygen and Carbon Isotopes in Separation of
Low and High Temperature Dolomites in Northeast of Iran
55
66
FA
Y
N
N
N
this study is focused on do lomi te s of the
Chehel-Kaman Formation (Upper Paleocene) that is located in
NE Iran. Field and petrographic studies lead to distinguish dl
and d2 dolomites. dL is fine crystals (Ie.<;ser than 10 micron) and
is associated with t:vaporatic sed ime nts. and d2 in addition to
fint: crystals. contains coarser crystals (50-RO micron) without
evaporatic sediments. Also. oxygen isotope of ell is hCltvicr than
-2.5 %" PDB and oxygen isotope of d2 is lighter than
- 6.5 %0 PDB. C'lrbon isotope in these dolomites ranges
between + 1.8 %0 to +3.5 %0 PDB. These data along with CL
o bse rvation show that d l dolomites are formed in lower
temperature (calculated temperature is 26°C) within supratidal
environment, while d2 dolomites are formed in higher
temperature (calculated temperature is more than n °C) during
burial stage.
Dolomites. Kopet-Dagh, Carbon and Oxygen isotopes,
C/u!hel-Kumllll Furmation
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