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Rakovanite

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John Rakovan
Formula:
Na3(H3V10O28) · 15H2O
System:
Monoclinic
Colour:
orange
Hardness:
1
Member of:
Name:
Named in honor of Professor John Rakovan (b. 1964), Miami University, Oxford, Ohio, for his contributions to the field of mineralogy.
(Not to be confused with radovanite.)

Classification of Rakovanite

Approved 2010
7/0.0-

7 : Phosphates, Arsenates, Vanadates
0 :
0 :
mindat.org URL:
http://www.mindat.org/min-40447.html
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Type Occurrence of Rakovanite

General Appearance of Type Material:
Rakovanite is transparent orange, with an orange-yellow streak. Crystals of rakovanite are up to 1 mm in maximum dimension and vary in habit from blocky to prismatic on [100], commonly exhibiting steps and striations parallel to [100].
Place of Conservation of Type Material:
The two cotype specimens used in the description of the mineral are housed in the mineral collection of the Natural History Museum of Los Angeles County under catalogue numbers 63357 and 63358.
Year of Discovery:
2010
Geological Setting of Type Material:
Colorado Plateau, sandstone hosted, vanadium-uranium, role front type deposit.

Physical Properties of Rakovanite

Sub-Adamantine
Diaphaneity (Transparency):
Transparent
Colour:
orange
Streak:
orange-yellow
Hardness (Mohs):
1
Hardness Data:
Measured
Tenacity:
Brittle
Fracture:
Conchoidal
Density:
2.407 g/cm3 (Calculated)

Crystallography of Rakovanite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 12.0248(17) Å, b = 17.121(3) Å, c = 18.140(3) Å
β = 106.242(8)°
Ratio:
a:b:c = 0.702 : 1 : 1.06
Unit Cell Volume:
V 3,585.55 ų (Calculated from Unit Cell)
Morphology:
Crystals vary in habit from blocky to prismatic on [100], commonly exhibiting steps and striations parallel to [100].
Comment:
Space group P21/n.
X-Ray Powder Diffraction Data:
d-spacingIntensity
11.270 (100)
8.709 (78)
7.696 (81)
6.892 (63)
3.445 (24)
2.935 (42)
2.798 (31)
2.433 (24)

Optical Data of Rakovanite

Type:
Biaxial (+)
RI values:
nα = 1.776 nβ = 1.803 nγ = 1.910
2V:
Measured: 2Vz589nm = 56(1)°
Max Birefringence:
δ = 0.134
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r < v, strong, parallel
Pleochroism:
Strong
Comments:
X light yellow, Y orangish yellow, Z yellowish orange, Z > Y > X.

Chemical Properties of Rakovanite

Formula:
Na3(H3V10O28) · 15H2O
Essential elements:
All elements listed in formula:
Empirical Formula:
(Na2.90K0.07Ca0.01Al0.01){H2.98[V10O28]}•15H2O

Relationship of Rakovanite to other Species

Member of:
Other Members of Group:
HuemuliteNa4Mg(V10O28) · 24H2O
HummeriteK2Mg2(V10O28) · 16H2O
LasaliteNa2Mg2(V10O28) · 20H2O
MagnesiopascoiteCa2Mg(V10O28) · 16H2O
PascoiteCa3(V10O28) · 17H2O
7/0.0-JuonniiteCaMgSc(PO4)2(OH) · 4H2O
7/0.0-KanoneroviteNa3Mn2+(P3O10) · 12H2O
7/0.0-CanutiteNaMn3[AsO4][AsO3(OH)]2

Other Names for Rakovanite

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 Rakovanite

Reference List:
Kampf, A.R., Hughes, J.M., Marty, J., Gunter, M. and Nash, B. (2010) Rakovanite, IMA 2010-052. CNMNC Newsletter No. 7, February 2010, page 29; Mineralogical Magazine, 75, 27-31.

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.

Internet Links for Rakovanite

Localities for Rakovanite

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.
USA
 
  • Colorado
    • San Miguel Co.
      • Slick Rock District
        • Gypsum Valley
Collected by and in the collection of Joe Marty. p-XRD analayzed by Tony Kampf.
CNMNC Newsletter No. 7, February 2010, page 29; Mineralogical Magazine, 75, 27-31.; 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
CNMNC Newsletter No. 7, February 2010, page 29; Mineralogical Magazine, 75, 27-31.; 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
  • Utah
    • San Juan Co.
      • La Sal District (Paradox Valley District)
        • La Sal Creek Canyon
Gunnar Farber
Mineral and/or Locality  
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