Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Boltwoodite

This page is currently not sponsored. Click here to sponsor this page.
Bertram Borden Boltwood
Formula:
(K,Na)(UO2)[HSiO4] · 0.5H2O
System:
Monoclinic
Colour:
Pale yellow, orange ...
Lustre:
Sub-Vitreous, Waxy, Silky
Hardness:
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:
Rod-like to acicular yellow crystals in radial groups.

Compare also natroboltwoodite.

Classification of Boltwoodite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
mindat.org URL:
http://www.mindat.org/min-716.html
Please feel free to link to this page.

First Recorded Occurrence of Boltwoodite

Year of Discovery:
1956

Occurrences of Boltwoodite

Geological Setting:
Alteration zone around uranium deposits.

Physical Properties of Boltwoodite

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:
4.7 g/cm3 (Measured)    4.46 g/cm3 (Calculated)

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 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

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
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 Boltwoodite

Formula:
(K,Na)(UO2)[HSiO4] · 0.5H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Fe,Ca,Na

Relationship of Boltwoodite to other Species

Structurally related to group(s):
9.AK.05Soddyite(UO2)2SiO4 · 2H2O
9.AK.10CuprosklodowskiteCu(UO2)2[HSiO4]2 · 6H2O
9.AK.10Oursinite(Co,Mg)(UO2)2[HSiO4]2 · 6H2O
9.AK.10SklodowskiteMg(UO2)2[HSiO4]2 · 5H2O
9.AK.15KasolitePb(UO2)[SiO4] · H2O
9.AK.15Natroboltwoodite(H3O)(Na,K)UO2SiO4 · H2O
9.AK.15Uranophane-βCa(UO2)2(HSiO4)2 · 5H2O
9.AK.15UranophaneCa(UO2)2[HSiO4]2 · 5H2O
9.AK.15Beta-Uranophane
9.AK.20SwamboiteUH6(UO2)6(SiO4)6 · 30H2O
9.AK.25HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2O
9.AK.25MetahaiweeiteCa(UO2)2Si6O15 · nH2O
9.AK.25Ranquilite
9.AK.30WeeksiteK2(UO2)2(Si5O13) · 4H2O
9.AK.30CoutinhoiteThxBa(1-2x)(UO2)2Si5O13 · (H2O)1+y (0 < x < 0.5 and 0 < y < (2+x))
9.AK.35Ursilite(Mg,Ca)4(UO2)4(Si2O5)5.5(OH)5 · 13H2O
9.AK.35MagnioursiliteMg4(UO2)4(Si2O5)5(OH)6 · 20H2O
9.AK.35CalcioursiliteCa4(UO2)4(Si2O5)5(OH)6 · 15H2O
9.AK.40UranosiliteUO3 · 7SiO2
14.16.1UranosiliteUO3 · 7SiO2
14.16.2Coffinite(U4+,Th)(SiO4)1-x(OH)4x
14.16.3Soddyite(UO2)2SiO4 · 2H2O
14.16.4SwamboiteUH6(UO2)6(SiO4)6 · 30H2O
14.16.5WeeksiteK2(UO2)2(Si5O13) · 4H2O
14.16.7Natroboltwoodite(H3O)(Na,K)UO2SiO4 · H2O
14.16.8CuprosklodowskiteCu(UO2)2[HSiO4]2 · 6H2O
14.16.9SklodowskiteMg(UO2)2[HSiO4]2 · 5H2O
14.16.10UranophaneCa(UO2)2[HSiO4]2 · 5H2O
14.16.11Uranophane-βCa(UO2)2(HSiO4)2 · 5H2O
14.16.12HaiweeiteCa(UO2)2[Si5O12(OH)2] · 6H2O
14.16.13MetahaiweeiteCa(UO2)2Si6O15 · nH2O
14.16.15Steacyite(◻,K)(Na,Ca)2(Th,U)[Si8O20]
14.16.16Ekanite(Ca,Fe2+,Pb)2(Th,U)[Si8O20]
14.16.17KasolitePb(UO2)[SiO4] · H2O
14.16.18OrlitePb3(UO2)3(Si2O7)2 · 6H2O
14.16.19Oursinite(Co,Mg)(UO2)2[HSiO4]2 · 6H2O

Other Names for Boltwoodite

Name in Other Languages:

Other Information

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 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

Localities for Boltwoodite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
      • 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
    • 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.
      • Spring Mts
        • 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.
Mineral and/or Locality  
Copyright © mindat.org 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: January 31, 2015 13:17:21 Page generated: January 31, 2015 03:18:12