Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Chat Now! (2 online) Mindat Auctions

Rooseveltite

Big Photo

Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany
© Richard Bayerl

Formula:
BiAsO
 
4
System:MonoclinicColour:White to pale gray, pale ...
Hardness:4 - 4½
Name:
For US Franklin Delano Roosevelt (1882-1945), 32nd. President of the United States of America.
Dimorph of:Tetrarooseveltite
Isostructural with:Monazite Group


Monazite Group

Classification of Rooseveltite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/A.18-10
Nickel-Strunz 10th (pending) edition ID:8.AD.50

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
Dana 8th edition ID:38.4.4.1

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
4 : AXO4
Hey's CIM Ref.:20.6.1

20 : Arsenates (also arsenates with phosphate, but without other anions)
6 : Arsenates of Bi
mindat.org URL:http://www.mindat.org/min-3444.html
Please feel free to link to this page.

Type Occurrence of Rooseveltite

Type Locality:Santiaguillo, Macha area, Chayanta Province, Potosí Department, Bolivia
Place of Conservation of Type Material:Smithsonian, Harvard University
Year of Discovery:1946
Geological Setting of type material:Veinlets in rhyolitic and dacitic lava flows.
Associated Minerals at type locality:
Wood Tin

Physical Properties of Rooseveltite

Lustre:Adamantine
Diaphaneity (Transparency):Transparent
Colour:White to pale gray, pale green, yellow
Hardness (Mohs):4 - 4½
Hardness (Vickers):VHN25=513 kg/mm2
Tenacity:Brittle
Fracture:Irregular/Uneven, Conchoidal
Density (measured):6.86 - 7.01 g/cm3
Density (calculated):7.21 g/cm3

Crystallography of Rooseveltite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Cell Parameters:a = 6.879(1) Å, b = 7.159(1) Å, c = 6.732(1) Å
β = 104.83°
Ratio:a:b:c = 0.961 : 1 : 0.94
Unit Cell Volume:V 320.49 ų (Calculated from Unit Cell)
Z:4
Morphology:Botryoidal crusts.
Comment:On synthetic material

Optical Data of Rooseveltite

Type:Biaxial (+)
RI values: nα = 2.090 nβ = 2.150 nγ = 2.270
2V:Measured: 50° , Calculated: 62°
Maximum Birefringence:δ = 0.180

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Anisotropism:Very high indices of refraction.
Dispersion:extreme

Chemical Properties of Rooseveltite

Formula:
BiAsO
 
4
Essential elements:As, Bi, O
All elements listed in formula:As, Bi, O

Relationship of Rooseveltite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.AD.05Nahpoite
Na
 
2
HPO
 
4
8.AD.10Monetite
CaHPO
 
4
8.AD.10Weilite
CaHAsO
 
4
8.AD.10Švenekite
Ca(H
 
2
AsO
 
4
)
 
2
8.AD.15Archerite
(K,NH
 
4
)[H
 
2
PO
 
4
]
8.AD.15Biphosphammite
(NH
 
4
,K)H
 
2
PO
 
4
8.AD.20Phosphammite
(NH
 
4
)
 
2
HPO
 
4
8.AD.25Buchwaldite
NaCaPO
 
4
8.AD.30Schultenite
PbHAsO
 
4
8.AD.35Chernovite-(Y)
YAsO
 
4
8.AD.35Dreyerite
BiVO
 
4
8.AD.35Wakefieldite-(Ce)
CeVO
 
4
8.AD.35Wakefieldite-(Y)
YVO
 
4
8.AD.35Xenotime-(Y)
YPO
 
4
8.AD.35Pretulite
ScPO
 
4
8.AD.35Xenotime-(Yb)
(Yb,Y,HREE)PO
 
4
8.AD.35Wakefieldite-(La)
LaVO
 
4
8.AD.40Pucherite
BiVO
 
4
8.AD.45Ximengite
BiPO
 
4
8.AD.50Gasparite-(Ce)
(Ce,REE)AsO
 
4
8.AD.50Monazite-(Ce)
(Ce,La,Nd,Th)PO
 
4
8.AD.50Monazite-(La)
(La,Ce,Nd)PO
 
4
8.AD.50Monazite-(Nd)
(Nd,La,Ce)PO
 
4
8.AD.50Cheralite
(Ca,Ce)(Th,Ce)[PO
 
4
]
 
2
8.AD.50Monazite-(Sm)
(Sm,Gd,Ce,Th)(PO
 
4
)
8.AD.50UM2005-35-VO:CaFePSiTh
(Th,Ca)[VO
 
4
,SiO
 
4
,PO
 
4
]
8.AD.55Tetrarooseveltite
Bi(AsO
 
4
)
8.AD.60Chursinite
(Hg-Hg)
 
0.5
Hg
2+
 
[AsO
 
4
]
8.AD.65Clinobisvanite
BiVO
 
4
Related Minerals - Hey's Index Grouping:

- +
20.6.2Preisingerite
Bi
 
3
[O|OH|(AsO
 
4
)
 
2
]
20.6.3Arsenobismite
20.6.4Atelestite
Bi
 
8
[O
 
5
|(OH)
 
5
|(AsO
 
4
)
 
3
]
20.6.5Mixite
BiCu
 
6
[(OH)
 
6
|(AsO
 
4
)
 
3
] · 3H
 
2
O
20.6.6Walpurgite
(BiO)
 
4
(UO
 
2
)[AsO
 
4
]
 
2
 · 3H
 
2
O

Other Names for Rooseveltite

Other Languages:
German:Rooseveltit
Russian:Рузвельтит
Spanish:Rooseveltita

Other Information

Other Information:Soluble in acids.
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 Rooseveltite

Reference List:Herzenberg (1946) Facultad. Nac. de Ing., Univ. Téc. Oruro, Boliviqa, Bol. Téc., no. 1 (as Roosevelita).

American Mineralogist (1947): 32: 372.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 697.

Tschermaks Mineralogische und Petrographische Mitteilungen (1972): 17: 71.

Acta Crystallographica (1982): B38: 1559-1561.

Internet Links for Rooseveltite

Search Engines:
  • Look for Rooseveltite on Google
  • Look for Rooseveltite images on Google
    • External Links:
  • Look for Rooseveltite on Webmineral
  • Look for Rooseveltite on Athena Mineralogy
  • Look for Rooseveltite on Wikipedia
  • Look for Rooseveltite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Rooseveltite in the Natural History Museum (London) online catalogue
    • Mineral Dealers:
  • Lapis Mineral Magazin
  • Buy fine minerals and gemstones from Pala International
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • The Arkenstone - Fine Minerals
  • Buy Fine Minerals from mineralsweb.com
  • Rare and Unusual minerals at Mineralogical Research Company
  • Find Rooseveltite on www.crystalclassics.co.uk
  • Top quality minerals from Kristalle of California
  • Buy minerals from Mineralium.com
  • Edwards Minerals - Fine Specimens
  • rare and unusual minerals mainly crystallized
    • Jobs:
  • Mining & Geology Jobs

    • Page Sponsor

    Sponsorship:This page is currently not sponsored. Click here to sponsor this page.

    Localities for Rooseveltite

    Show Locality List (20 Items)
    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.
    Mineral and/or Locality
    Google
     
    www.mindat.org Web
    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 24th Nov 2009 16:15:13