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Boltwoodite

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Formula:
(K,Na)(UO
 
2
)[HSiO
 
4
] · 0.5H
 
2
O
System:MonoclinicColour:Pale yellow, orange ...
Lustre:Sub-Vitreous, Waxy, SilkyHardness:3½ - 4
Name:
For Bertram Borden Boltwood (1870-1927), radiochemist at Yale University, New Haven, Connecticut, USA. Named by Clifford Frondel and Jun Ito.
Isostructural with:Uranophane Group


Rod-like to acicular yellow crystals in radial groups.

Compare also natroboltwoodite.

Classification of Boltwoodite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/B.34-60
Nickel-Strunz 10th (pending) edition ID:9.AK.15

9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates
Dana 8th edition ID:53.3.1.5

53 : NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
3 : Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)
Hey's CIM Ref.:14.16.6

14 : Silicates not Containing Aluminum
16 : Silicates of U
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Type Occurrence of Boltwoodite

Type Locality:Pick's Delta Mine (Delta Mine; Pick's Mine), Delta, San Rafael District (San Rafael Swell), Emery Co., Utah, USA
Year of Discovery:1956

Occurrences of Boltwoodite

Geological Setting:Alteration zone around uranium deposits.

Physical Properties of Boltwoodite

Lustre:Sub-Vitreous, Waxy, Silky
Diaphaneity (Transparency):Translucent
Comment:Aggregates vitreous to silky, dull to earthy in pseudomorphs
Colour:Pale yellow, orange yellow
Streak:White
Hardness (Mohs):3½ - 4
Tenacity:Brittle
Cleavage:Perfect
Perfect on {010}
imperfect on {001}
Fracture:Irregular/Uneven
Density (measured):4.7 g/cm3
Density (calculated):4.46 g/cm3

Crystallography of Boltwoodite

Crystal System:Monoclinic
Class (H-M):2 - Sphenoidal
Space Group:P21
Cell Parameters:a = 7.073(2) Å, b = 7.064(1) Å, c = 6.638(1) Å
β = 105.45°
Ratio:a:b:c = 1.001 : 1 : 0.94
Unit Cell Volume:V 319.67 ų (Calculated from Unit Cell)
Z:2
Morphology:Radiating acicular to fibrous crystals, also earthy pseudomorphs of uranium minerals
X-Ray Powder Diffraction:
d-spacingIntensity
6.81 (10)
6.40 (50)
3.54 (70)
3.40 (90)
2.95 (80)
2.91 (70)
1.900 (60)
1.764 (60)
(
Comments:35-490

Optical Data of Boltwoodite

Type:Biaxial (-)
RI values: nα = 1.668 - 1.670 nβ = 1.695 - 1.696 nγ = 1.698 - 1.703
Birefringence:0.007-0.008
Maximum Birefringence:δ = 0.030 - 0.033

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:r > v or r < v
Pleochroism:Weak
Comments:X= colorless
Y=Z= yellow

Chemical Properties of Boltwoodite

Formula:
(K,Na)(UO
 
2
)[HSiO
 
4
] · 0.5H
 
2
O
Simplified for copy/paste:(K,Na)(UO2)[HSiO4]·0.5H2O
Essential elements:H, K, O, Si, U
All elements listed in formula:H, K, Na, O, Si, U
Common Impurities:Fe,Ca,Na

Relationship of Boltwoodite to other Species

Structurally related to group(s):
Uranophane Group
Related Minerals - Nickel-Strunz Grouping):

- +
9.AK.05Soddyite
(UO
 
2
)
 
2
SiO
 
4
· 2H
 
2
O
9.AK.10Cuprosklodowskite
Cu(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 6H
 
2
O
9.AK.10Oursinite
(Co,Mg)(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 6H
 
2
O
9.AK.10Sklodowskite
Mg(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 5H
 
2
O
9.AK.15Kasolite
Pb(UO
 
2
)[SiO
 
4
] · H
 
2
O
9.AK.15Natroboltwoodite
(H
 
3
O)(Na,K)UO
 
2
SiO
 
4
· H
 
2
O
9.AK.15β-Uranophane
Ca(UO
 
2
)
 
2
(HSiO
 
4
)
 
2
· 5H
 
2
O
9.AK.15Uranophane
Ca(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 5H
 
2
O
9.AK.15Beta-Uranophane
9.AK.20Swamboite
UH
 
6
(UO
 
2
)
 
6
(SiO
 
4
)
 
6
· 30H
 
2
O
9.AK.25Haiweeite
Ca(UO
 
2
)
 
2
[Si
 
5
O
 
12
(OH)
 
2
] · 6H
 
2
O
9.AK.25Metahaiweeite
Ca(UO
 
2
)
 
2
Si
 
6
O
 
15
· nH
 
2
O
9.AK.25Ranquilite
9.AK.30Weeksite
K
 
2
(UO
 
2
)
 
2
(Si
 
5
O
 
13
) · 4H
 
2
O
9.AK.30Coutinhoite
Th
 
x
Ba
 
(1-2x)
(UO
 
2
)
 
2
Si
 
5
O
 
13
· (H
 
2
O)
 
1+y
(0 < x < 0.5 and 0 < y < (2+x))
9.AK.35Ursilite
(Mg,Ca)
 
4
(UO
 
2
)
 
4
(Si
 
2
O
 
5
)
 
5.5
(OH)
 
5
· 13H
 
2
O
9.AK.35Magnioursilite
Mg
 
4
(UO
 
2
)
 
4
(Si
 
2
O
 
5
)
 
5
(OH)
 
6
· 20H
 
2
O
9.AK.35Calcioursilite
Ca
 
4
(UO
 
2
)
 
4
(Si
 
2
O
 
5
)
 
5
(OH)
 
6
· 15H
 
2
O
9.AK.40Uranosilite
UO
 
3
· 7SiO
 
2
Related Minerals - Hey's Index Grouping:

- +
14.16.1Uranosilite
UO
 
3
· 7SiO
 
2
14.16.2Coffinite
(U
4+
 
,Th)(SiO
 
4
)
 
1-x
(OH)
 
4x
14.16.3Soddyite
(UO
 
2
)
 
2
SiO
 
4
· 2H
 
2
O
14.16.4Swamboite
UH
 
6
(UO
 
2
)
 
6
(SiO
 
4
)
 
6
· 30H
 
2
O
14.16.5Weeksite
K
 
2
(UO
 
2
)
 
2
(Si
 
5
O
 
13
) · 4H
 
2
O
14.16.7Natroboltwoodite
(H
 
3
O)(Na,K)UO
 
2
SiO
 
4
· H
 
2
O
14.16.8Cuprosklodowskite
Cu(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 6H
 
2
O
14.16.9Sklodowskite
Mg(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 5H
 
2
O
14.16.10Uranophane
Ca(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 5H
 
2
O
14.16.11β-Uranophane
Ca(UO
 
2
)
 
2
(HSiO
 
4
)
 
2
· 5H
 
2
O
14.16.12Haiweeite
Ca(UO
 
2
)
 
2
[Si
 
5
O
 
12
(OH)
 
2
] · 6H
 
2
O
14.16.13Metahaiweeite
Ca(UO
 
2
)
 
2
Si
 
6
O
 
15
· nH
 
2
O
14.16.15Steacyite
(◻,K)(Na,Ca)
 
2
(Th,U)[Si
 
8
O
 
20
]
14.16.16Ekanite
(Ca,Fe
2+
 
,Pb)
 
2
(Th,U)[Si
 
8
O
 
20
]
14.16.17Kasolite
Pb(UO
 
2
)[SiO
 
4
] · H
 
2
O
14.16.18Orlite
Pb
 
3
(UO
 
2
)
 
3
(Si
 
2
O
 
7
)
 
2
· 6H
 
2
O
14.16.19Oursinite
(Co,Mg)(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
· 6H
 
2
O

Other Names for Boltwoodite

Other Languages:
German:Boltwoodit
Russian:Болтвудит
Spanish:Boltwoodita

Other Information

Health Warning:Contains uranium - always wash hands after handling. Avoid inhaling dust when handling or breaking. Never lick or ingest. Avoid prolonged exposure in proximity of the body. Store away from inhabited areas.

References for Boltwoodite

Reference List:

- +
American Mineralogist: 46: 12-25.

American Mineralogist: 66: 610-625.

Burns, P.C. (1998) The structure of boltwoodite and implications of solid-solution towards sodium boltwoodite. Canadian Mineralogist: 36: 1069-1075.

Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Internet Links for Boltwoodite

Search Engines:
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  • External Links:
  • Look for Boltwoodite on Webmineral
  • Look for Boltwoodite on Athena Mineralogy
  • Look for Boltwoodite on Wikipedia
  • Look for Boltwoodite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Boltwoodite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Localities for Boltwoodite

    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.
    Argentina
     
    • Córdoba
      • Punilla Department
        • Sierra de Córdoba
    Toubes, R.O., Chaar, E. y Spikermann, J.P., 1973. Minerales radiactivos de la República Argentina. 5 Congreso Geológico Argentino, 1, 249-260.
      • Quebrada del Tigre
    American Mineralogist: 46: 12-25.
    • La Rioja
      • Coronel Felipe Varela Department
    Lucero, H. N., Díez, D. y Timoneri, A. (1963). Contribución al conocimiento de algunas manifestaciones uraníferas en la provincias de Córdoba, La Rioja y San Luis. Anales de las segundas Jornadas Geológicas Argentinas, Salta, Argentina.
    Lucero, H. N., Díez, D. y Timoneri, A. (1963). Contribución al conocimiento de algunas manifestaciones uraníferas en la provincias de Córdoba, La Rioja y San Luis. Anales de las segundas Jornadas Geológicas Argentinas, Salta, Argentina.
    American Mineralogist: 46: 12-25.
    Australia
     
    • South Australia
      • Flinders Ranges
        • North Flinders Ranges
          • Arkaroola Region (Arkaroola Station)
            • Mt Painter area
    2003, Brugger, J., Ansermet, S. & Pring, A. ' Uranium minerals from Mt Painter, Northern Flinders ranges, South Australia' Australian Journal of Mineralogy, vol. 9, n°1, pp 15-31
      • Mt Lofty Ranges
        • South Mt Lofty Ranges (Adelaide Hills)
          • Fleurieu Peninsula
            • Myponga
    American Mineralogist: 46: 12-25.
    Austria
     
    • Carinthia
      • Saualpe
        • Bad St Leonhard
          • Mica Mines
    G.Blaß (2000)
    Canada
     
    • Nunavut Territory
      • Baker Lake
    Miller A. (1980)
      • Kivalliq Region
        • Baker Lake
    Miller A. (1980) Uranium Geology of the Eastern Baker Lake Basin, District of Keewatin, Northwest Territories; G.S.C. Bulletin 330.
    • Ontario
      • Kenora District
        • Docker Township
    Trail,R.J. 1980, Catalogue of Canadian Minerals, GSC Paper 80-18
    China
     
    Congjian Pu (1990): Acta Mineralogica Sinica 10(2), 157-160
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Karlovy Vary Region
        • Krušné Hory Mts (Erzgebirge)
          • Jáchymov District (St Joachimsthal)
    Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
    • Moravia (Mähren; Maehren)
      • Vysočina Region
        • Žďár nad Sázavou
    Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1)
    France
     
    • Limousin
      • Haute-Vienne
        • Mailhac
    Le Règne Minéral, Hors Série IV, 1998
    Germany
     
    • Rhineland-Palatinate
      • Hunsrück
        • Birkenfeld
          • Ellweiler
    Aufschluss 69/(7+8), Lapis 79/(7+8)
    • Saxony
      • Vogtland
        • Zobes-Bergen District
          • Bergen U deposit
            • Bergen
    Wittern: "Mineralfundorte in Deutschland", 2001
    Japan
     
    • Honshu Island
      • Chugoku Region
        • Tottori Prefecture
    K. Watanabe (1976) Journal of the Faculty of Science, Shinshu University, 11, 53-113 (in japanese with english summary)
          • Tohgoh-cho
    Watanabe (1976) Journal of the Faculty of Science, Shinshu University, 11, 53-106.
    Mexico
     
    • Chihuahua
      • Mun. de Aldama
        • Peña Blanca District
          • Sierra Peña Blanca
    http://www.swri.org/4org/d20/ghs/PBlanca/mineral.html
    Namibia
     
    • Erongo Region
      • Swakopmund District
    Rafael Hernandes Corrêa-Silva.
    Am.Min.: 84:993.; Irene M. Abraham (2009): Geology and spatial distribution of uranium mineralisation in the SK anomaly area, Rossing area, Namibia, Master thesis University of the Witwatersrand.
        • Goanikontes
    Palfi, A.G., Wartha, R., Niedermayr, G. & Jahn, S. (2001): Das Boltwoodit-Vorkommen von Goanikontes in der Namib. In: Jahn, S. et al (editors): Namibia. Zauberwelt edler Steine und Kristalle. Bode Verlag. 2001, p 126-135
    Norway
     
    • Nordland
      • Tysfjord
    Eldjarn, K.(1988). Etter Neumann. NAGS-nytt 15 (1-4),62
    • Østfold
      • Rygge
    Kristiansen, R. (2007): Sekundære uranmineraler i Norge. Norsk bergverksmuseum Skrift. 35: 49-59
    South Africa
     
    • Western Cape Province
      • Central Karoo District
    Minerals of South Africa
    Spain
     
    • Catalonia
      • Lleida (Lérida)
        • El Pallars Jussà
          • La Vall Fosca
            • La Torre de Cabdella (La Torre de Capdella)
              • Castell-estaó
    Joan Abella i Creus and Joan Viñals i Olià (2012) NUEVOS MINERALES DE LA “MINA EUREKA”: METAMUNIRITA, SCHRÖCKINGERITA, BOLTWOODITA Y GORDAITA, CASTELL-ESTAÓ, LA TORRE DE CABDELLA, LLEIDA, ESPAÑA. - http://mineralsabella.blogspot.com.es/2012/06/nuevos-minerales-de-la-mina-eureka.html
    Sweden
     
    • Jämtland
      • Krokom
        • Offerdal
    • Lappland
      • Arjeplog
    Natural History Museum, Stockholm collection # 19790341
    • Medelpad
      • Ånge
    UK
     
    • England
      • Cornwall
        • St Just District
          • St Just
            • Botallack
              • Wheal Owles
    [Journal of the Russell Society, 6(1), 17-26 (1995)]
    Tindle, A.G. (2008) Minerals of Britian and Ireland
      • Dumfries & Galloway (Kirkcudbrightshire)
        • Needle's Eye
    R. S. W. Braithwaite and J. R. Knight (1990) Rare Minerals, Including Several New to Britain, in Supergene Alteration of U-Cu-As-Bi-Co Mineralisation Near Dalbeattie, South Scotland. Mineralogical Magazine 54:129-131.
    USA
     
    • Arizona
      • Coconino Co.
        • Cameron District
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 141.; Bollin, E. M., & Kerr, P. F. (1958). Uranium mineralization near Cameron, Arizona. In Guidebook of the Black Mesa Basin, northern Arizona: New Mexico Geological Society, 9th Field Conference Society Guidebook (Vol. 9, pp. 161-168).
            • Huskon Mines
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 141; Daphne Ross cited in Honea, R.M. (1961), New data on boltwoodite, an alkali uranyl silicate, Am.Min.: 46: 24.
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 141; Daphne Ross cited in Honea, R.M. (1961), New data on boltwoodite, an alkali uranyl silicate, Am.Min.: 46: 24.
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 181.
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 141; Austin, S.R. (1964), Mineralogy of the Cameron area, Coconino Co., AZ, US Atomic Energy Comm. RME 99, Tech. Inf. Serv., Oak Ridge, TN: 99.
          • Cameron area
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 141; Austin, S.R. (1964), Mineralogy of the Cameron area, Coconino Co., AZ, US Atomic Energy Comm. RME 99, Tech. Inf. Serv., OAk Ridge, TN: 99.
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 141; Austin, S.R. (1964), Mineralogy of the Cameron area, Coconino Co., AZ, US Atomic Energy Comm. RME 99, Tech. Inf. Serv., Oak Ridge, TN: 99.
    • California
      • San Bernardino Co.
        • Bristol Mts
          • Amboy
    Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 108; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 517.
    • Colorado
      • Gunnison Co.
        • Marshall Pass District
    Minerals of Colorado (1997) Eckels, E. B.
      • Saguache Co.
        • Marshall Pass District
    Minerals of Colorado (1997) Eckel, E. B.; Am Min 50:909-923
    • Nevada
      • Clark Co.
        • Goodsprings District
    Rocks & Minerals, Nov. 1999
    • Pennsylvania
      • Northampton Co.
        • Forks Township
          • Easton
    Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
    American Mineralogist: 46: 12-25.; Am.Min.: 45: 39-52
    • Texas
      • Live Oak Co.
    R&M 66:3 pp 196-224
    • Utah
      • Emery Co.
        • San Rafael District (San Rafael Swell)
          • Delta
    [Nickel & Nichols, 1991 - "Mineral Reference Manual, p25]
    U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
    UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Grand Co.
        • Polar Mesa District (Polar Mesa)
    Collected by and in the collection of Brent Thorne.
        • Seven Mile District
    UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Juab Co.
        • Honeycomb Hills
    Rocks & Minerals: 68(6): 381-393.
      • San Juan Co.
        • Blanding
    Mineralogical Record: 22(5): 381-393.; Mineralogical Record 22:384
    UGMS Bull 117 Minerals and Mineral Localities of Utah
    UGMS Bull 117 Minerals and Mineral Localities of Utah
        • Montezuma Canyon
    UGMS Bull 117 Minerals and Mineral Localities of Utah
        • White Canyon District
          • Red Canyon
    UGMS Bull 117 Minerals and Mineral Localities of Utah
          • White Canyon
            • Copper Point
    American Mineralogist: 46: 12-25.
    Min Rec 30 pp231-238
    • Wyoming
      • Big Horn Co.
        • Little Mountain District
    American Mineralogist: 46: 12-25.
      • Niobrara Co.
        • Lance Creek
    American Mineralogist: 46: 12-25.
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