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About RossiteHide

Clarence S. Ross
Ca(VO3)2 · 4H2O
Pale yellow; yellow in transmitted light.
Vitreous, Pearly
2 - 3
Specific Gravity:
Crystal System:
Named 1927 by William F. Foshag and Frank L. Hess in honor of Dr. Clarence Samuel Ross (September 20, 1880 - April 19, 1975, Rockville, Maryland, USA), American geologist and mineralogist, U.S. Geological Survey, Washington, D.C., USA.
Dimorph of:
Rossite Group.

A rare calcium vanadate hydrate that transforms reversibly to metarossite (dehydration within a few weeks time).

Classification of RossiteHide

Approved, 'Grandfathered' (first described prior to 1959)

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
D : Inovanadates

1 : Normal Anhydrous Vanadium Oxysalts

21 : Vanadates (and vanadates with arsenate or phosphate)
2 : Vanadates of Mg, Ca, Sr or Ba

Physical Properties of RossiteHide

Vitreous, Pearly
Pale yellow; yellow in transmitted light.
2 - 3 on Mohs scale
One direction, prominent.
2.45 g/cm3 (Measured)    2.42 g/cm3 (Calculated)

Optical Data of RossiteHide

Biaxial (-)
RI values:
nα = 1.710 nβ = 1.770 nγ = 1.840
Measured: 60° , Calculated: 90°
Max Birefringence:
δ = 0.130
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
relatively strong
Optical class is based on recrystallized material.

Chemical Properties of RossiteHide

Ca(VO3)2 · 4H2O
IMA Formula:
Ca(VO3)2 · 4H2O

Crystallography of RossiteHide

Crystal System:
Class (H-M):
1 - Pinacoidal
Space Group:
Cell Parameters:
a = 8.552 Å, b = 8.576 Å, c = 7.028 Å
α = 101.5°, β = 114.96°, γ = 103.39°
a:b:c = 0.997 : 1 : 0.819
Unit Cell V:
428.03 ų (Calculated from Unit Cell)
Small glassy lumps surrounded by alteration rims. Artificial crystals commonly elongated [001] and rather flattened on {010}; rarely tabular {001}, lath-like or acicular [001].
On {100} ?
Space group is based on recrystallized material.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005081RossiteAhmed F R, Barnes W H (1963) The crystal structure of rossite The Canadian Mineralogist 7 713-7261963Dolores River, Colorado, USA0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of RossiteHide

General Appearance of Type Material:
Veinlets; small glasy lumps surrounded by alteration rims of metarossite.
Place of Conservation of Type Material:
U.S. National Museum of Natural History, Washington, D.C., USA: #95331, R5707.
Geological Setting of Type Material:
Carnotite-bearing sandstone
Associated Minerals at Type Locality:

Other Language Names for RossiteHide

Simplified Chinese:水钒钙石
Traditional Chinese:水釩鈣石

Relationship of Rossite to other SpeciesHide

Structurally related to group(s):

Common AssociatesHide

EpsomiteMgSO4 · 7H2O
GypsumCaSO4 · 2H2O
HuemuliteNa4Mg(V10O28) · 24H2O
HummeriteK2Mg2(V10O28) · 16H2O
Associated Minerals Based on Photo Data:
4 photos of Rossite associated with PascoiteCa3(V10O28) · 17H2O
3 photos of Rossite associated with MetarossiteCa(V2O6) · 2H2O
2 photos of Rossite associated with SherwooditeCa4.5(AlV4+2V5+12O40) · 28H2O
1 photo of Rossite associated with CoffiniteU(SiO4) · nH2O
1 photo of Rossite associated with CalciodelrioiteCa(VO3)2 · 4H2O
1 photo of Rossite associated with Montroseite(V3+,Fe3+)O(OH)

Related Minerals - Nickel-Strunz GroupingHide

4.HD.10MetarossiteCa(V2O6) · 2H2OTric. 1 : P1
4.HD.15MuniriteNaVO3 · 1.9H2OMon.
4.HD.25DickthomsseniteMg(V2O6) · 7H2OMon. 2/m : B2/b
4.HD.30AnsermetiteMn2+(V2O6) · 4H2OMon. 2/m

Related Minerals - Dana Grouping (8th Ed.)Hide · 2H2OTric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

21.2.1MetarossiteCa(V2O6) · 2H2OTric. 1 : P1
21.2.3MetahewettiteCaV6O16 · 3H2OMon. 2/m
21.2.4HewettiteCaV6O16 · 9H2OMon. 2/m : P21/m
21.2.5PintadoiteCa2(V2O7) · 9H2O
21.2.6Hendersonite(Ca,Sr)1.3V6O16 · 6H2OOrth.
21.2.7Fernandinite(Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2OMon. 2/m : B2/m
21.2.8PascoiteCa3(V10O28) · 17H2OMon. 2 : B2
21.2.9SherwooditeCa4.5(AlV4+2V5+12O40) · 28H2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd
21.2.10MelanovanaditeCa(V5+,V4+)4O10 · 5H2OTric. 1 : P1
21.2.11Grantsite(Na,Ca)2+x(V5+,V4+)6O16 · 4H2OMon. 2/m : P21/m
21.2.12HummeriteK2Mg2(V10O28) · 16H2OTric.
21.2.14DelrioiteCaSr(V2O6)(OH)2 · 3H2OMon.
21.2.15Straczekite(Ca,K,Ba)(V5+,V4+)8O20 · 3H2OMon.
21.2.16GamagariteBa2Fe3+(VO4)2(OH)Mon. 2/m : P21/m

Other InformationHide

Slowly soluble in water. Transforms to Metarossite in open air within a matter of weeks. The process is reversible.
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 RossiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Foshag, W.F., Hess, F.L. (1928) Rossite and metarossite; two new vanadates from Colorado. Proceedings of the U.S. National Museum: 72: 1.
Foshag, W.F. (1928) New mineral names. American Mineralogist: 13: 158-160.
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.: 1053-1054.
Ahmed, F.R., Barnes, W.H. (1963) The crystal structure of rossite. The Canadian Mineralogist: 7: 713–726.
Bayliss, P. (1985) Powder X-ray diffraction data of rossite. Mineralogical Magazine: 49: 140-141.
Frost, R.L., Erickson, K.L., Weier, M.L. (2004) Hydrogen bonding in selected vanadates: a Raman and infrared spectroscopy study. Spectrochimica Acta Part A: 60: 2419.

Internet Links for RossiteHide

Localities for RossiteHide

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.
  • Mendoza Province
    • Malargüe Department
      • Pampa Amarilla mining district
C.E. Gordillo, E. Linares, R.O. Toubes, H. Winchell: Amer. Mineral. 51:1-13 (1966); American Mineralogist: 51: 1-13
Czech Republic
  • Pardubice Region
    • Chrudim District
      • Prachovice
Sejkora J., Škácha P., Venclík V., Plášil J. (2013): Vanad-uranová mineralizace v lomu Prachovice (Česká republika) [anadium-uranium mineralization in the Prachovice quarry (Czech Republic)]. Bull. mineral.-petrolog. Odd. Nár. Muz. (Praha) 21, 113-130.
  • Loja Province
Manrique, J., Guaman, G., & Guartan, J. (2018). Geochemical Prospecting Study of the Vanadium-Uranium Mineralization of Puyango, Ecuador (No. IAEA-CN--261).
  • Hardap Region
    • Daweb
Bowell, R. J., & Davies, A. A. (2017). Assessment of supergene uranium-vanadium anomalies, Meob Bay deposit, Namibia. Geochemistry: Exploration, Environment, Analysis, 17(2), 101-112.
  • Republic of Karelia
    • Zaonezhie peninsula
      • Velikaya Guba uran-vanadium deposit
P.M. Kartashov data
  • Arizona
    • Apache County
Chenoweth, W. L. (1994). The Location and Production History of the Chimney No. 1 Uranium-Vanadium Mine, Apache County, Arizona. Arizona Geological Survey Contributed Report 94-B
Page, L. R.; Stocking, H. E.; Smith, H. B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. USGS Professional Paper 300 pp195-201
        • Lukachukai Mining District
          • White Ash Peak
Page, L. R.; Stocking, H. E.; Smith, H. B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. USGS Professional Paper 300 pp1243-267
Scarborough, Robert B. (1981), Radioactive occurrences and uranium production in Arizona, Arizona Bureau of Geology and Mineral Technology Report for U.S. Department of Energy (Atomic Energy Commission), GJBX-143. RME-2071: 117.
Scarborough, Robert B. (1981), Radioactive occurrences and uranium production in Arizona, Arizona Bureau of Geology and Mineral Technology Report for U.S. Department of Energy (Atomic Energy Commission), GJBX-143. RME-2071: 121.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 357; Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 78.
  • Colorado
    • Mesa Co.
      • Gateway
Kampf, A.R., Nash, B.P., Marty, J., Hughes, J.M. (2017) Mesaite, CaMn2+5(V2O7)3·12H2O, a new vanadate mineral from the Packrat mine, near Gateway, Mesa County, Colorado, USA. Mineralogical Magazine: 81: 319–327.
    • Montrose Co.
      • Bull Canyon Mining District
Kampf, A.R., Hughes, J.M., Marty, J., Nash, B.P., Chen, Yu-S., Steele, I.M. (2014) Bluestreakite, K4Mg2(V4+2V5+8O28)·14H2O, a new mixed-valence decavanadate mineral from the Bluestreak Mine, Montrose County, Colorado: crystal structure and descriptive mineralogy. Canadian Mineralogist. 52:1007-1018; Kampf, A. R., Marty, J., Nash, B. P., Plášil, J., Kasatkin, A. V., & Škoda, R. (2012). Calciodelrioite, Ca (VO3) 2 (H2O) 4, the Ca analogue of delrioite, Sr (VO3) 2 (H2O) 4. Mineralogical Magazine, 76(7), 2803-2817.
      • Uravan Mining District
"Luc Vandenberghe" collection
    • San Miguel Co.
      • Bull Pen Canyon
Proceedings of the U.S. National Museum (1927): 72, 1-12.; Rocks & Minerals 80:5 pp358-359
      • Slick Rock Mining District
Minerals of Colorado (1997) Eckel, E. B.; Frost, R.L., K.L. Erickson, M.L. Weier, and O. Carmody, Raman and infrared spectroscopy of selected vanadates. Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy, 2005. 61A(5): p. 829-834.; Kampf, A. R., Plášil, J., Nash, B. P., & Marty, J. (2019). Ammoniomathesiusite, a new uranyl sulfate–vanadate mineral from the Burro mine, San Miguel County, Colorado, USA. Mineralogical Magazine, 83(1), 115-121.
Minerals of Colorado (1997) Eckel, E. B.
Kampf, A.R., Hughes, J.M., Marty, J. & Nash, B. (2013) Wernerbaurite {[Ca(H2O)7]2(H2O)2(H3O)2}{V10O28}, and schindlerite, {[Na2(H2O)10](H3O)4}{V10O28}, the first hydronium-bearing decavanadate minerals. Canadian Mineralogist: 51: 297-312.
In the collection of Alex Earl
Kampf, A.R., Marty, J., Nash, B.P., Plášil, J., Kasatkin, A.V., Škoda, R. (2012): Calciodelrioite, Ca(VO3)2(H2O)4, the Ca analogue of delrioite, Sr(VO3)2(H2O)4. Mineralogical Magazine, 76, 2803-2817.; Kampf, A.R., Hughes, J.M., Marty, J., Gunter, M.E., Nash, B. (2011): Rakovanite, Na3{H3[V10O28]}·15H2O, a new member of the pascoite family with a protonated decavanadate polyanion. Canadian Mineralogist: 49: 595-604.
      • Uravan Mining District
Minerals of Colorado (1997) E.B. Eckel
        • Carnation Mine group
Excalibur Mineral Co. sample and analysis
  • New Mexico
    • San Juan Co.
Northrop, Minerals of New Mexico, 3rd. Rev. Ed., 1996
        • Eastside mines
NMBGMR Open-file Report - 466
  • Utah
    • Grand Co.
      • Moab Mining District
        • Moab
Min News 16:10 p1
      • Polar Mesa Mining District
Collected by and in the collection of Brent Thorne.
      • Thompsons Mining District
Steve Sorrell Collection
        • The Poison Strip
UGMS Bull 117 Minerals and Mineral Localities of Utah
UGMS Bull 117 Minerals and Mineral Localities of Utah
        • Yellow Cat Mesa
Kasatkin, A.V., Plášil, J., Marty, J., Belakovskiy, D.I., Lykova, I.S. (2014): Nestolaite, CaSeO3·H2O, a new mineral from the Little Eva mine, Grand County, Utah, USA. Mineralogical Magazine, 78, 497-505. ; Kasatkin, A. V., Plasil, J., Pekov, I. V., Belakovskiy, D. I., Nestola, F., Cejka, J., ... & Thorne, B. (2015). Karpenkoite, Co3 (V2O7)(OH) 2· 2H2O, a cobalt analogue of martyite from the Little Eva mine, Grand County, Utah, USA. Journal of Geosciences, 60(4), 251-257.
          • Parco Mine Group
UGMS Bull 117 Minerals and Mineral Localities of Utah
    • San Juan Co.
      • La Sal Mountains
        • La Sal Mining District (Paradox Valley Mining District)
          • La Sal
Hughes, J.M., Wise, W.S., Gunter, M.E., Morton, J.P., Rakovan, J. (2008) Lasalite, Na2Mg2(V10O28)•20H2O, a new decavanadate mineral from the Vanadium Queen mine, La Sal District, Utah: description, atomic arrangement, and relationship to the pascoite group of minerals. The Canadian Mineralogist: 46: 1365-1372.
          • Lion Canyon
Collected by and in the collection of Brent Thorne.; Kampf A R, Hughes J M, Marty J, Nash B (2012) Postite, Mg(H2O)6Al2(OH)2(H2O)8(V10O28)·13H2O, a new mineral species from the La Sal Mining District, Utah: Crystal structure and descriptive mineralogy. The Canadian Mineralogist 50, 45-53
      • La Sal Quadrangle
Canadian Mineralogist (2001) 39, pp. 1691-1700
      • Red Canyon
Min News 5:10 p1-5
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