Help|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 ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember 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


This page is currently not sponsored. Click here to sponsor this page.
Amber yellow, golden ...
Sub-Vitreous, Resinous, Earthy
Originally named lewisite in 1895 by Eugen Hussak and George Thurland Prior in honor of William James Lewis [January 10, 1847 Llanwyddelan, Montgomeryshire, Wales, United Kingdom - April 16, 1926 Godalming, Surry, England, United Kingdom], morphological crystallographer and Professor of Mineralogy, Cambridge University, Cambridge, England, UK. Renamed as Ti-bearing roméite in 2007 in anticipation of systematic names replacing trivial names. The nomenclature of the pyrochlore supergroup was revised by Atencio et al. (2010) and the lewisite (type specimen) was reclassified.
The type sample for "lewisite" (Hussak & Prior 1895) is now to be classified as hydroxycalcioroméite.
Found as yellow to brown octahedral crystals to 1 mm and as earthy masses.

Classification of Hydroxycalcioroméite

Redefined by the IMA, Renamed by the IMA
Approval Year:
First Published:
Approval History:
Pre-IMA, grandfathered (as lewisite).
2007: Descredited as Ti-bearing roméite (Burke 2007).
2010: Redefined and renamed by IMA as hydroxycalcioroméite (IMA special procedure 2010)

Physical Properties of Hydroxycalcioroméite

Sub-Vitreous, Resinous, Earthy
Diaphaneity (Transparency):
Transparent, Translucent
Amber yellow, golden yellow, yellow brown
Pale yelow brown
Hardness (Mohs):
Hardness Data:
4.95 g/cm3 (Measured)    5.31 g/cm3 (Calculated)

Optical Data of Hydroxycalcioroméite


Chemical Properties of Hydroxycalcioroméite

Elements listed in formula:

Crystallography of Hydroxycalcioroméite

Crystal System:
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Cell Parameters:
a = 10.264 Å
Unit Cell Volume:
V 1,081.31 ų (Calculated from Unit Cell)
ICDD 7-66
X-Ray Powder Diffraction Data:
2.94 (100)
1.813 (100)
1.548 (100)
1.179 (50)
1.150 (50)
1.050 (50)
0.989 (50)
ICDD 7-66

Occurrences of Hydroxycalcioroméite

Type Occurrence of Hydroxycalcioroméite

Associated Minerals at Type Locality:

Relationship of Hydroxycalcioroméite to other Species

Other Members of Group:
Common Associates:

Other Names for Hydroxycalcioroméite

Name in Other Languages:

Other Information

Not fluorescent in UV
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 Hydroxycalcioroméite

Reference List:
Hussak and Prior (1895) Mineralogical Magazine: 11: 80.

Zeitschrift für Kristallographie (1932): 82: 72.

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.: 1020-1022.

Rouse, R. .C., Dunn, P.J., Peacor, D. R. & Wang Liping (1998): Structural studies of the natural antimonian pyrochlores. I. Mixed valency, cation site splitting, and symmetry reduction in lewisite. Journal of Solid State Chemistry 141: 562-569.

Mineralogical Magazine (2003): 67: 31.

American Mineralogist (1998): 83: 403.

American Mineralogist (1999): 84: 1198.

Burke, Ernest A.J. (2007) A Mass Discreditation of GQN Minerals. Canadian Mineralogist: 44(6): 1557-1560.

Atencio, D., Andrade, M.B., Christy, A.G., Gieré, R., Kartashov, P.M. (2010) The pyrochlore supergroup of minerals: nomenclature. The Canadian Mineralogist: 48: 673-698.

Christy, A.G., Atencio, D. (2013) Clarification of status of species in the pyrochlore supergroup. Mineralogical Magazine: 77: 13-20.

Internet Links for Hydroxycalcioroméite URL:
Please feel free to link to this page.

Localities for Hydroxycalcioroméite

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.
(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.
  • Victoria
    • Loddon Shire
      • Inglewood
Birch, W. D. (2015) Native antimony from Inglewood, Victoria. Australian Journal of Mineralogy Vol. 17 #2, 88-90.
  • Lower Austria
    • Waldviertel
      • Geras
        • Kottaun
Kolitsch, U. (2014): 1883) Bismutit, Fluorapatit, Fluorit, Galenit, Hydroxycalcioroméit(?), Kettnerit, Oxyplumboroméit, Pyromorphit, Tetraedrit, gediegen Wismut(?) und Wittichenit aus dem neuen, kleinen Steinbruch („Andradit-Bruch“) nördlich Kottaun, Geras, Waldviertel, Niederösterreich Pp. 117-119 in Niedermayr, G. et al. (2014): Neue Mineralfunde aus Österreich LXIII. Carinthia II, 204./124., 65-146.
Brazil (TL)
  • Minas Gerais
    • Iron Quadrangle
      • Ouro Preto
        • Main district
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: 1022; Contributions to Mineralogy and Petrology (1997): 127: 136; American Mineralogist (1998): 83: 403; American Mineralogist (1999): 84: 1198.; Hussak and Prior (1900) Mineralogical Magazine: 12: 244; Rouse, R. .C., Dunn, P.J., Peacor, D. R. & Wang Liping (1998): Structural studies of the natural antimonian pyrochlores. I. Mixed valency, cation site splitting, and symmetry reduction in lewisite. Journal of Solid State Chemistry 141: 562-569.
  • Ontario
    • Thunder Bay District
      • Bomby Township
Harris (1989)
  • Guangxi Zhuang Autonomous Region
    • Hechi Prefecture
      • Jinchengjiang District
        • Beixiang - Furongchang ore field
Liangming Fan, Rubo Zhang, and Xingzhen Wang (1983): Geological Review 48(6), 575-577
New Zealand
  • South Island
    • Hindon
Museum Victoria Registration Number: M 48638
  • Värmland
    • Filipstad
Pavel M. Kartashov analytical data (2010) Ulf Nyberg specimens
  • Arizona
    • Cochise Co.
      • Johnny Lyon Hills
        • Tres Alamos Wash
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 136, 276, 323.
  • Utah
    • Tooele Co.
      • Sheeprock Mts
        • Little Valley
Norman King(photo-id 634925)
    • Utah Co.
      • Oquirrh Mts
        • Fairfield
          • Clay Canyon
Rocks & Minerals (1970): 45(11): 667-674.; Wendell Wilson (2010) The Clay Canyon Variscite Mine, Fairfield Utah. Mineralogical Record 41:321-349
  • Hà Giang Province
Shunso Ishihara and Pham Tich Xuan (2013)Distribution of some ore metals around the Mau Due stibnite deposits, northernmost Vietnam. Bulletin of the Geological Survey of Japan 64:51-57.
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2017, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: July 29, 2017 12:51:19 Page generated: July 10, 2017 11:18:03
Go to top of page