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East Mine, Bayan Obo deposit (Bayun-Obo deposit; Baiyunebo deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia Autonomous Region, China
© Pavel M. Kartashov
|System:||Monoclinic||Colour:||Red, yellowish-red, ...|
|Name:||Named after its composition containing Barium, Iron (Latin: ferrum), Titanium and Silicon|
Closely related to Jinshajiangite and Cámaraite.
In original description F erroneously wasn't determined. After the second find of F-rich mineral on Verkhnee Espe, Chinese mineral was reinvestigated and was found F-dominant.
Classification of Bafertisite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||8/C.13-70|
|Nickel-Strunz 10th (pending) edition ID:||9.BE.55|
9 : SILICATES (Germanates)
B : Sorosilicates
E : Si2O7 groups, with additional anions; cations in octahedral  and greater coordination
|Dana 8th edition ID:||56.2.6b.1|
56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in  and/or > coordination
|Hey's CIM Ref.:||14.9.17|
14 : Silicates not Containing Aluminum
9 : Silicates of Ti
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Type Occurrence of Bafertisite
|Type Locality:||Bayan Obo deposit (Bayun-Obo deposit; Baiyunebo deposit), Bayan Obo, Bayan Obo Mining District, Baotou League (Baotou Prefecture), Inner Mongolia Autonomous Region, China|
|Year of Discovery:||1959|
Physical Properties of Bafertisite
|Colour:||Red, yellowish-red, light brown|
Crystallography of Bafertisite
|Cell Parameters:||a = 10.6Å, b = 13.64Å, c = 12.47Å|
β = 119.5°
|Ratio:||a:b:c = 0.777 : 1 : 0.914|
|Unit Cell Volume:||V 1,569.22 Å³ (Calculated from Unit Cell)|
Optical Data of Bafertisite
|RI values:||nα = 1.786 - 1.808 nβ = 1.813 - 1.835 nγ = 1.852 - 1.862|
|2V:||Measured: 54° to 86°, Calculated: 82° to 88°|
|Maximum Birefringence:||δ = 0.066|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Surface Relief:||Very High|
|Dispersion:||r << v|
Chemical Properties of Bafertisite
|Essential elements:||Ba, F, Fe, O, Si, Ti|
|All elements listed in formula:||Ba, F, Fe, H, Mn, O, Si, Ti|
Relationship of Bafertisite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Bafertisite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Bafertisite
Semenov, E. I., and Chang Pei-Shan (1959) New mineral - Bafertisite. Science Record (Beijing) 3(12), 652-55 (in Russian). - American Mineralogist (1960), 45, 1317 (abstract)
American Mineralogist (1972), 57, 1005.
Doklady Akademii Nauk SSSR 149, 1416-1419.
Internet Links for Bafertisite
Localities for Bafertisite
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Channing Uranium Trench, Dickinson Co., Michigan, USAFrom Travis Olds, 12th Dec 2013 05:34:18