Crystallography Open Database

Information card for entry 9016423

Preview

Coordinates	9016423.cif
External links	AMCSD

Structure parameters

Mineral name	Nacrite
Formula	Al2 O9 Si2
Calculated formula	Al2 O9 Si2
Title of publication	The Crystal Structure of Nacrite Al2 O3 . 2Si O2 . 2H2 O and the Polymorphism of the Kaolin Minerals.
Authors of publication	Hendricks, S.
Journal of publication	Zeitschrift fur Kristallographie
Year of publication	1939
Journal volume	100
Pages of publication	509 - 518
a	8.94 Å
b	5.14 Å
c	43 Å
α	90°
β	90.33°
γ	90°
Cell volume	1975.89 Å³
Number of distinct elements	3
Space group number	9
Hermann-Mauguin space group symbol	C 1 c 1
Hall space group symbol	C -2yc
Duplicate of	1011062
Has coordinates	Yes
Has disorder	No
Has F_obs	No

Version history

Revision	Date	Message	Files
292100 (current)	2024-05-29	Inserting Z values into entries of range 9 that miss it	9016423.cif
201816	2017-10-06	cod/ Enhancement: marking COD entries that are known to be related to the AMCSD entries using the _cod_related_entry data loop.	9016423.cif
184280	2016-07-07	cif/9/ Marking 756 entries in range 9* as duplicates of other entries in the COD. All entries, containing '_cod_database_code' in their titles, were copied to a separate MySQL table 'duplicates' for comparison of the rest of their titles against the "original" entries. Formulae, both given by authors and calculated, were not compared, since duplicate entries in range 9* do not contain Z values. Command to compare and mark the duplicates: mysql -u root duplicates9 -p -e 'select A.file, B.file from data as A join duplicates as B on A.file = B.duplicateof and replace(replace(replace(A.title, "~", ""), " ", ""), "$-", "") = replace(B.title, " ", "") where A.duplicateof is null' -N \ \| while read -a LINE; \ do \ cat $(cod-locate ${LINE[1]}) <(echo _cod_duplicate_entry ${LINE[0]}) \ \| cif_filter -h $(cod-locate ${LINE[1]}) \ \| sponge $(cod-locate ${LINE[1]}); \ done	9016423.cif
176465	2016-02-16	cif/ (antanas@kurmis) Replacing _[local]_cod_* tags with their equivalents from the COD CIF dictionary in multiple entries in range 9.	9016423.cif
86000	2013-05-09	cif/ (saulius@koala.ibt.lt) Adding new mineral structures from AMCSD.	9016423.cif