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Rossite

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Clarence S. Ross
Formula:
Ca(VO3)2•4H2O
Colour:
Pale yellow; yellow in transmitted light.
Lustre:
Vitreous, Pearly
Hardness:
2 - 3
Specific Gravity:
2.45
Crystal System:
Triclinic
Name:
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).




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Classification of RossiteHide

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

Physical Properties of RossiteHide

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

Optical Data of RossiteHide

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 RossiteHide

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

Crystallography of RossiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 8.552 Å, b = 8.576 Å, c = 7.028 Å
α = 101.5°, β = 114.96°, γ = 103.39°
Ratio:
a:b:c = 0.997 : 1 : 0.819
Unit Cell V:
428.03 ų (Calculated from Unit Cell)
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 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

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

Relationship of Rossite to other SpeciesHide

Structurally related to group(s):

Common AssociatesHide

EpsomiteMgSO4 · 7H2O
GypsumCaSO4 · 2H2O
HuemuliteNa4Mg(V10O28) · 24H2O
HummeriteK2Mg2(V10O28) · 16H2O
ThénarditeNa2SO4
Associated Minerals Based on Photo Data:
Pascoite4 photos of Rossite associated with Pascoite on mindat.org.
Metarossite3 photos of Rossite associated with Metarossite on mindat.org.
Sherwoodite2 photos of Rossite associated with Sherwoodite on mindat.org.
Coffinite1 photo of Rossite associated with Coffinite on mindat.org.
Calciodelrioite1 photo of Rossite associated with Calciodelrioite on mindat.org.
Montroseite1 photo of Rossite associated with Montroseite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.HD.10MetarossiteCa(V2O6) · 2H2OTric. 1 : P1
4.HD.15MuniriteNaVO3 · 1.9H2OMon.
4.HD.20MetamuniriteNaVO3Orth.
4.HD.25DickthomsseniteMg(V2O6) · 7H2OMon. 2/m : B2/b
4.HD.30AnsermetiteMn2+(V2O6) · 4H2OMon. 2/m

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

47.1.1.2MetarossiteCa(V2O6) · 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.
21.2.12HummeriteK2Mg2(V10O28) · 16H2OTric.
21.2.13MetadelrioiteCaSr(V2O6)(OH)2Tric.
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

Notes:
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.
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
    • Mesa Co.
      • Gateway District
        • Gateway
Kampf, A.R., Nash, B.P., Marty, J., Hughes, J.M. (2016): Mesaite, CaMn2+5(V2O7)3·12H2O, a new vanadate mineral from the Packrat mine, near Gateway, Mesa County, Colorado, USA. Mineralogical Magazine: 80: (in press)
    • Montrose Co.
      • Bull Canyon 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 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 {[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.
      • 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)
Steve Sorrell Collection
        • The Poison Strip
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.
          • Parco Mine Group
UGMS Bull 117 Minerals and Mineral Localities of Utah
    • San Juan Co.
      • La Sal District (Paradox Valley District)
        • La Sal
Collected by and in the collection of Brent Thorne.
        • 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
      • White Canyon District
        • Red Canyon
Min News 5:10 p1-5
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