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Boltwoodite

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Bertram Borden Boltwood
Formula:
(K,Na)(UO2)(SiO3OH) · 1.5H2O
Colour:
Pale yellow, orange yellow
Lustre:
Sub-Vitreous, Waxy, Silky
Hardness:
3½ - 4
Specific Gravity:
4.7
Crystal System:
Monoclinic
Name:
For Bertram Borden Boltwood (1870-1927), radiochemist at Yale University, New Haven, Connecticut, USA. Named by Clifford Frondel and Jun Ito.
Isostructural with:
Rod-like to acicular yellow crystals in radial groups.

Compare also natroboltwoodite.


Hide all sections | Show all sections

Classification of BoltwooditeHide

Approved, 'Grandfathered' (first described prior to 1959)
9.AK.15

9 : SILICATES (Germanates)
A : Nesosilicates
K : Uranyl neso- and polysilicates
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)
14.16.6

14 : Silicates not Containing Aluminum
16 : Silicates of U

Physical Properties of BoltwooditeHide

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

Optical Data of BoltwooditeHide

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

Formula:
(K,Na)(UO2)(SiO3OH) · 1.5H2O
IMA Formula:
(K,Na)UO2(SiO3OH) · 1.5H2O
Common Impurities:
Fe,Ca,Na

Crystallography of BoltwooditeHide

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 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 DiffractionHide

Powder Diffraction Data:
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

Type Occurrence of BoltwooditeHide

Other Language Names for BoltwooditeHide

Relationship of Boltwoodite to other SpeciesHide

Other Members of this group:
NatroboltwooditeNa(UO2)(SiO3OH) · H2O
UranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2 : P21
Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2OMon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Calcite42 photos of Boltwoodite associated with Calcite on mindat.org.
Fluorite8 photos of Boltwoodite associated with Fluorite on mindat.org.
Zippeite5 photos of Boltwoodite associated with Zippeite on mindat.org.
Brochantite3 photos of Boltwoodite associated with Brochantite on mindat.org.
Quartz2 photos of Boltwoodite associated with Quartz on mindat.org.
Uraninite2 photos of Boltwoodite associated with Uraninite on mindat.org.
Cerussite2 photos of Boltwoodite associated with Cerussite on mindat.org.
Sklodowskite1 photo of Boltwoodite associated with Sklodowskite on mindat.org.
Gypsum1 photo of Boltwoodite associated with Gypsum on mindat.org.
Goethite1 photo of Boltwoodite associated with Goethite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AK.05Soddyite(UO2)2SiO4 · 2H2OOrth.
9.AK.10CuprosklodowskiteCu(UO2)2(SiO3OH]2 · 6H2OTric. 1 : P1
9.AK.10OursiniteCo(UO2)2(SiO3OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmca
9.AK.10SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2OMon. 2/m : B2/m
9.AK.15KasolitePb(UO2)[SiO4] · H2OMon. 2/m : P21/b
9.AK.15NatroboltwooditeNa(UO2)(SiO3OH) · H2O
9.AK.15Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2OMon.
9.AK.15UranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2 : P21
9.AK.15Beta-UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
9.AK.20Swamboite-(Nd)Nd0.333[(UO2)(SiO3OH)](H2O)∼2.5Mon.
9.AK.25HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2OMon.
9.AK.25MetahaiweeiteCa(UO2)2Si6O15 · nH2O
9.AK.30WeeksiteK2(UO2)2(Si5O13) · 4H2OOrth.
9.AK.30CoutinhoiteThxBa(1-2x)(UO2)2Si5O13 · (H2O)1+y (0 < x < 0.5 and 0 < y < (2+x))Orth.
9.AK.35UrsiliteMg4(UO2)4(Si2O5)5.5(OH)5 · 13H2OOrth.
9.AK.35MagnioursiliteMg4(UO2)4(Si2O5)5(OH)6 · 20H2O
9.AK.35CalcioursiliteCa4(UO2)4(Si2O5)5(OH)6 · 15H2O
9.AK.40UranosiliteUO3 · 7SiO2Orth.

Related Minerals - Dana Grouping (8th Ed.)Hide

53.3.1.1KasolitePb(UO2)[SiO4] · H2OMon. 2/m : P21/b
53.3.1.2UranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2 : P21
53.3.1.3SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2OMon. 2/m : B2/m
53.3.1.4CuprosklodowskiteCu(UO2)2(SiO3OH]2 · 6H2OTric. 1 : P1
53.3.1.6NatroboltwooditeNa(UO2)(SiO3OH) · H2O
53.3.1.7OursiniteCo(UO2)2(SiO3OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmca
53.3.1.8Swamboite-(Nd)Nd0.333[(UO2)(SiO3OH)](H2O)∼2.5Mon.
53.3.1.9Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.16.1UranosiliteUO3 · 7SiO2Orth.
14.16.2Coffinite(U4+,Th)(SiO4)1-x(OH)4xTet.
14.16.3Soddyite(UO2)2SiO4 · 2H2OOrth.
14.16.4Swamboite-(Nd)Nd0.333[(UO2)(SiO3OH)](H2O)∼2.5Mon.
14.16.5WeeksiteK2(UO2)2(Si5O13) · 4H2OOrth.
14.16.7NatroboltwooditeNa(UO2)(SiO3OH) · H2O
14.16.8CuprosklodowskiteCu(UO2)2(SiO3OH]2 · 6H2OTric. 1 : P1
14.16.9SklodowskiteMg(UO2)2(SiO3OH)2 · 6H2OMon. 2/m : B2/m
14.16.10UranophaneCa(UO2)2(SiO3OH)2 · 5H2OMon. 2 : P21
14.16.11Uranophane-βCa(UO2)2(SiO3OH)2 · 5H2OMon.
14.16.12HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2OMon.
14.16.13MetahaiweeiteCa(UO2)2Si6O15 · nH2O
14.16.15SteacyiteK0.3(Na,Ca)2ThSi8O20Tet. 4/mmm (4/m 2/m 2/m) : P4/mcc
14.16.16EkaniteCa2ThSi8O20Tet. 4 2 2 : I4 2 2
14.16.17KasolitePb(UO2)[SiO4] · H2OMon. 2/m : P21/b
14.16.18OrlitePb3(UO2)3(Si2O7)2 · 6H2O
14.16.19OursiniteCo(UO2)2(SiO3OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmca

Other InformationHide

Health Risks:
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 BoltwooditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist: 46: 12-25.
Stohl, F. V. & Smith, D. K. (1981): The crystal chemistry of the uranyl silicate minerals. American Mineralogist 66, 615-625.
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 BoltwooditeHide

Localities for BoltwooditeHide

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.
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.
    • San Javier department
      • Sierra de Comechingones
        • San Javier
          • Quebrada del Tigre
American Mineralogist: 46: 12-25.
  • La Rioja
    • Coronel Felipe Varela department
      • Guandacol
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; Brugger, J., Meisser, N., Etschmann, B., Ansermet, S., & Pring, A. (2011). Paulscherrerite from the Number 2 Workings, Mount Painter Inlier, Northern Flinders Ranges, South Australia:“Dehydrated schoepite” is a mineral after all. American Mineralogist, 96(2-3), 229-240.
    • 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
    • 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.
Miller A. (1980)
  • 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
 
  • Nouvelle-Aquitaine
    • Haute-Vienne
      • Meilhac
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; Wong, V., Goodell, P. C., & Anthony, E. Y. (1999, January). Characterization of U-series disequilibria at the Pena Blanca natural analogue site, Chihuahua, Mexico. In MRS Proceedings (Vol. 556, p. 801). Cambridge University Press.
Namibia
 
  • Erongo Region
    • Swakopmund District
Rafael Hernandes Corrêa-Silva.
Am.Min.: 84:993.; Kinnaird, J. A., and Nex, P. A. M., (2007): A review of geological controls on uranium mineralisation in sheeted leucogranites within the Damara Orogen, Namibia: Trans. Inst. Min. Metall. B, Applied Earth Science , V.116, pp. 68-85; Abraham, I. M., (2009): Geology and spatial distribution of uranium mineralisation in the SK anomaly area, Rossing area, Namibia, Master thesis University of the Witwatersrand, pg 29;
      • 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.; Windisch, W. (2014) An introduction to micromounting.
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 # 19790342
Natural History Museum, Stockholm collection # 19790341
  • Medelpad
    • Ånge
UK
 
  • England
    • Cornwall
      • St Just
        • Botallack
[Journal of the Russell Society, 6(1), 17-26 (1995)]
    • Devon
      • Dartmoor & Teign Valley District
        • Dartmoor Forest
          • Princetown
Alysson Rowan Collection
Tindle, A.G. (2008) Minerals of Britian and Ireland
    • Dumfries & Galloway
Braithwaite, R.S.W. and Knight, J.R. (1990) Rare Minerals, Including Several New to Britain, in Supergene Alteration of U-Cu-As-Bi-Co Mineralisation Near Dalbeattie, South Scotland. Mineralogical Magazine, vol. 54, n° 374: 129-131.; Handbook of Mineralogy.
Miller, J.M. and Taylor, K. (1966) Bull. Geol. Surv. G. B. 25, 9. [M.A. 18, 17.]; Livingstone, A. and Macpherson, H.G. (1983) Fifth supplementary list of British minerals (Scottish). Mineralogical Magazine, vol. 47, n° 342, p. 99-105.
      • 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.
Ukraine
 
  • Kirovohrad Oblast' (Kirovohrads'ka Oblast')
Cuney, M., Emetz, A., Mercadier, J., Mykchaylov, V., Shunko, V., & Yuslenko, A. (2012). Uranium deposits associated with Na-metasomatism from central Ukraine: a review of some of the major deposits and genetic constraints. Ore Geology Reviews, 44, 82-106.
Cuney, M., Emetz, A., Mercadier, J., Mykchaylov, V., Shunko, V., & Yuslenko, A. (2012). Uranium deposits associated with Na-metasomatism from central Ukraine: a review of some of the major deposits and genetic constraints. Ore Geology Reviews, 44, 82-106.
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 area
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.
    • Mesa Co.
Handbook of Mineralogy
    • Saguache Co.
      • Marshall Pass District
Minerals of Colorado (1997) Eckel, E. B.; Am Min 50:909-923
  • Nevada
    • Clark Co.
      • Spring Mts
        • Goodsprings District
          • Shenandoah Peak (Shenandoah Mountain)
Rocks & Minerals, Nov. 1999
  • Pennsylvania
    • Northampton Co.
      • Easton
Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
          • C.K. Williams Quarry complex (Williams and Company Rock Quarry)
American Mineralogist: 46: 12-25.; Am.Min.: 45: 39-52
  • Texas
    • Live Oak Co.
U.S. Geological Survey,2005,Mineral Resources Data System :U.S. Geological Survey,Reston, Virginia
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.
Collection of Alex Earl
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
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.
Mineral and/or Locality  
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