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Rossite

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Formula:
Ca(V2O6) · 4H2O
System:
Triclinic
Colour:
Pale yellow; yellow in ...
Hardness:
2 - 3
Name:
Named after Dr. Clarence Samuel Ross (1880-1975), 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 Rossite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
4.HD.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
D : Inovanadates
47.1.1.1

47 : VANADIUM OXYSALTS
1 : Normal Anhydrous Vanadium Oxysalts
21.2.2

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

General Appearance of First Recorded Material:
Veinlets; small glasy lumps surrounded by alteration rims of metarossite.
Place of Conservation of First Recorded Material:
U.S. National Museum of Natural History, Washington, D.C., USA: #95331, R5707.
Year of Discovery:
1926
Geological Setting of First Recorded Material:
Carnotite-bearing sandstone
Associated Minerals at First Recorded Locality:

Physical Properties of Rossite

Vitreous, Pearly
Diaphaneity (Transparency):
Transparent
Colour:
Pale yellow; yellow in transmitted light.
Hardness (Mohs):
2 - 3
Tenacity:
Brittle
Cleavage:
Distinct/Good
One direction, prominent.
Density:
2.45 g/cm3 (Measured)    2.42 g/cm3 (Calculated)

Crystallography of Rossite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 8.552Å, b = 8.576Å, c = 7.028Å
α = 101.5°, β = 114.96°, γ = 103.39°
Ratio:
a:b:c = 0.997 : 1 : 0.819
Z:
2
Morphology:
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].
Twinning:
On {100} ?
Comment:
Space group is based on recrystallized material.
X-Ray Powder Diffraction:
Image Loading

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

Optical Data of Rossite

Type:
Biaxial (-)
RI values:
nα = 1.710 nβ = 1.770 nγ = 1.840
2V:
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
Dispersion:
relatively strong
Comments:
Optical class is based on recrystallized material.

Chemical Properties of Rossite

Formula:
Ca(V2O6) · 4H2O
Essential elements:
All elements listed in formula:

Relationship of Rossite to other Species

Structurally related to group(s):
4.HD.10MetarossiteCa(V2O6) · 2H2O
4.HD.15MuniriteNaVO3 · 1.9H2O
4.HD.20MetamuniriteNaVO3
4.HD.25DickthomsseniteMg(V2O6) · 7H2O
4.HD.30AnsermetiteMn2+(V2O6) · 4H2O
21.2.1MetarossiteCa(V2O6) · 2H2O
21.2.3MetahewettiteCaV6O16 · 3H2O
21.2.4HewettiteCaV6O16 · 9H2O
21.2.5PintadoiteCa2(V2O7) · 9H2O
21.2.6Hendersonite(Ca,Sr)1.3V6O16 · 6H2O
21.2.7Fernandinite(Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2O
21.2.8PascoiteCa3(V10O28) · 17H2O
21.2.9SherwooditeCa4.5(AlV24+V125+O40) · 28H2O
21.2.10MelanovanaditeCa(V5+,V4+)4O10 · 5H2O
21.2.11Grantsite(Na,Ca)V6O16 · 4H2O
21.2.12HummeriteK2Mg2(V10O28) · 16H2O
21.2.13MetadelrioiteCaSr(V2O6)(OH)2
21.2.14DelrioiteCaSr(V2O6)(OH)2 · 3H2O
21.2.15Straczekite(Ca,K,Ba)(V5+,V4+)8O20 · 3H2O
21.2.16GamagariteBa2Fe3+(VO4)2(OH)

Other Names for Rossite

Name in Other Languages:
German:Rossit
Russian:Россит
Simplified Chinese:水钒钙石
水钒钙矿
Spanish:Rossita
Traditional Chinese:水釩鈣石
水釩鈣礦

Other Information

Other Information:
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 Rossite

Reference List:
Foshag, W. F. and Hess, F. L. (1928): Rossite and metarossite; two new vanadates from Colorado. Proceedings of the U.S. National Museum, 72, 1.

American Mineralogist (1928): 13: 160 (abstract).

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. and W.H. Barnes (1963) The crystal structure of rossite. Canadian Mineralogist: 7: 713–726.

Bayliss, P. (1985) Powder X-ray diffraction data of rossite. Mineralogical Magazine 49: 140-141.

Internet Links for Rossite

Localities for Rossite

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
 
  • Mendoza
    • Malargüe Department
      • Pampa Amarilla District
C.E. Gordillo, E. Linares, R.O. Toubes, H. Winchell: Amer. Mineral. 51:1-13 (1966); American Mineralogist: 51: 1-13
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Pardubice Region
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.
Russia
 
  • Northern Region
    • Karelia Republic
      • Lake Onega
        • Zaonezhie peninsula
          • Velikaya Guba uran-vanadium deposit
P.M. Kartashov data
USA
 
  • Arizona
    • Apache Co.
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
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
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 357; Galbraith, F.W. & D.J. Brennan (1959), Minerals of AZ: 78.
  • Colorado
    • Montrose Co.
      • Uravan 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 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.
Minerals of Colorado (1997) Eckels, E. B.
        • Gypsum Valley
KAMPF, A.R., HUGHES, J.M., MARTY, J. & NASH, B. (2013) Wernerbaurite,
      • Uravan District
Minerals of Colorado (1997) E.B. Eckels
        • 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
Min News 16:10 p1
      • Polar Mesa District (Polar Mesa)
Collected by and in the collection of Brent Thorne.
UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Thompsons District (S. E. Thomsons)
        • Parco Mine Group
UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Yellow Cat District (W. part of Thompsons District)
        • Cisco
UGMS Bull 117 Minerals and Mineral Localities of Utah
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.
    • San Juan Co.
      • La Sal District (Paradox Valley District)
        • La Sal Creek Canyon
Collected by and in the collection of Brent Thorne.
        • Lyon Canyon Creek
Collected by and in the collection of Brent Thorne.
      • La Sal Quadrangle
Canadian Mineralogist (2001) 39, pp. 1691-1700
      • White Canyon District
        • Red Canyon
Min News 5:10 p1-5
Mineral and/or Locality  
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