登录注册
主页关于 MindatMindat手册Mindat的历史版权Who We Are联系我们于 Mindat.org刊登广告
捐赠给 MindatCorporate Sponsorship赞助板页已赞助的板页在 Mindat刊登 广告的广告商于 Mindat.org刊登广告
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe Elements书籍及杂志
搜索矿物的性质搜索矿物的化学Advanced Locality Search随意显示任何一 种矿物Random Locality使用minID搜索邻近产地Search Articles搜索词汇表更多搜索选项
搜索:
矿物名称:
地区产地名称:
关键字:
 
Mindat手册添加新照片Rate Photos产区编辑报告Coordinate Completion Report添加词汇表项目
Mining Companies统计会员列表Mineral Museums矿物展及活动The Mindat目录表设备设置
照片搜索Photo Galleries今天最新的照片昨天最新的照片用户照片相集过去每日精选照片相集Mineral Photography

Bahianite

This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About BahianiteHide

09930880015612323991247.jpg
Flag of Bahia, Brazil
Formula:
Al5Sb3O14(OH)2
Colour:
Tan, cream, orange-brown, brown; crystals colourless, tan, pale violet; yellow internal reflections in transmitted light
Lustre:
Adamantine
Hardness:
9
Specific Gravity:
4.78 - 5.46
Crystal System:
Monoclinic
Name:
The name refers to the State of Bahia, Brazil, from within which state the initial specimens were found.
Currently the only known purely aluminium antimonate mineral. Structurally related to simpsonite.

The structure is unique and is based on hcp (hexagonal close packed) arrange of oxygen atoms, the set being parallel to {001}. There are layers consisting of edge-sharing Al5O14(OH)2 sheets, that corner-link to linear trimers of the Sb3O1413- composition.


Classification of BahianiteHide

Approved
4.DC.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
C : With medium-sized cations; sheets of edge-sharing octahedra
44.3.7.1

44 : ANTIMONATES
3 : Miscellaneous
7.13.7

7 : Oxides and Hydroxides
13 : Oxides of As, Sb and Bi

Physical Properties of BahianiteHide

Adamantine
Transparency:
Transparent, Translucent
Colour:
Tan, cream, orange-brown, brown; crystals colourless, tan, pale violet; yellow internal reflections in transmitted light
Hardness:
Hardness:
VHN100=1605 kg/mm2 - Vickers
Cleavage:
Perfect
on {100}
Fracture:
Irregular/Uneven
Density:
4.78 - 5.46 g/cm3 (Measured)    5.26 g/cm3 (Calculated)

Optical Data of BahianiteHide

Type:
Biaxial (-)
RI values:
nα = 1.810 nβ = 1.870 nγ = 1.920
Max Birefringence:
δ = 0.110
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v
Pleochroism:
Weak

Chemical Properties of BahianiteHide

Formula:
Al5Sb3O14(OH)2
IMA Formula:
Al5Sb5+3O14(OH)2

Crystallography of BahianiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 9.406 Å, b = 11.541 Å, c = 4.41 Å
β = 90.94°
Ratio:
a:b:c = 0.815 : 1 : 0.382
Unit Cell V:
478.66 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Curved and striated crystals, diamond-shaped or rectangular
Twinning:
Pseudohexagonal multiple contact twins, chrysoberyl-like

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.241 Å(100)
3.194 Å(100)
2.156 Å(80)
4.712 Å(70)
2.457 Å(70)
2.411 Å(70)
1.648 Å(70)
Comments:
Recorded on type material

Type Occurrence of BahianiteHide

General Appearance of Type Material:
Water-worn, bean-shaped pebbles, to 10 cm, with polycrystalline or radial-fibrous structure; also as crystals, lining pockets in the pebbles
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA (No. 119088);
National Museum of Natural History, Washington, D.C., USA (Nos. 133875, 135922)
Geological Setting of Type Material:
In potholes as stream-worn pebbles and as residual concentrates above weathered volcanic rock
Associated Minerals at Type Locality:

Synonyms of BahianiteHide

Other Language Names for BahianiteHide

German:Bahianit
Spanish:Bahianita

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Bahianite associated with QuartzSiO2
2 photos of Bahianite associated with MuscoviteKAl2(AlSi3O10)(OH)2

Related Minerals - Nickel-Strunz GroupingHide

4.DC.10SimpsoniteAl4(Ta,Nb)3O13(OH,F)Trig. 3 : P3

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.13.1ArsenoliteAs2O3Iso. m3m (4/m 3 2/m) : Fd3m
7.13.2ClaudetiteAs2O3Mon. 2/m
7.13.3SenarmontiteSb2O3Iso. m3m (4/m 3 2/m) : Fd3m
7.13.4ValentiniteSb2O3Orth. mmm (2/m 2/m 2/m) : Pccn
7.13.5CervantiteSb3+Sb5+O4Orth.
7.13.6StibiconiteSb3+Sb5+2O6(OH)
7.13.8Cualstibite-1M(Cu,Al)3(OH)6[Sb5+(OH)6]Mon. 2/m : P21/b
7.13.9BismutostibiconiteBi(Sb5+,Fe3+)2O7Iso. m3m (4/m 3 2/m) : Fd3m
7.13.107.13.11StibivaniteSb2VO5Orth.
7.13.12BismiteBi2O3Mon. 2/m : P21/b
7.13.13SilléniteBi12SiO20Iso. 2 3 : I2 3

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for BahianiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Moore, P.B., Araki, T. (1976) Bahianite, Al5Sb35+O14(O,OH)2. Neues Jahrbuch für Mineralogie, Abhandlungen: 126: 113-125.
Moore, P. B. and Araki, T. (1976) Bahianite, Al6Sb3O14(O,OH)2, a novel hexagonal close-packed oxide structure. Neues Jahrbuch für Mineralogie, Abhandlungen: 126: 113-125.
Moore, P. B., Barbosa, C. do P., and Gaines, R. V. (1978) Bahianite, Sb3Al5O14(OH)2, a new species. Mineralogical Magazine: 42: 179-182.
Fleischer, M., Chao, G.Y., Pabst, A. (1979) New mineral names. American Mineralogist: 64: 464-467.
Cassedanne, J. P. (1985) Bahianite from Brazil. Mineralogical Record: 16: 111-115.
Anthony, J. W. et al. (1997) Handbook of Mineralogy, Vol. 3, 34.

Internet Links for BahianiteHide

Localities for BahianiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Brazil (TL)
 
  • Bahia
    • Érico Cardoso
      • Paramirim das Crioulas
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 33
Jeannine and Jacques Cassedanne : "Présence d'eskolaite dans les alluvions stannifères de la Chapada Diamantina (Bahia-Brésil), Bull. Mineral., 1980, 103, pp 600-602.
    • Paramirim
[MinRec 16:111]
 
矿物 and/or 产地  
版权所有© mindat.org1993年至2020年,除了规定的地方。 Mindat.org全赖于全球数千个以上成员和支持者们的参与。
隐私政策 - 条款和条款细则 - 联络我们 Current server date and time: 2020.2.23 09:22:27 Page generated: 2020.2.22 21:32:57
Go to top of page