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Rakovanite

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Sunday Mine, Slick Rock District, San Miguel Co., Colorado, USA

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Formula:
Na
 
3
(H
 
3
V
 
10
O
 
28
) · 15H
 
2
O
System:MonoclinicColour:orange
Hardness:1
Member of:Pascoite Group
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

IMA status:Approved 2010
Strunz 8th edition ID:7/0.0-

7 : Phosphates, Arsenates, Vanadates
0 :
0 :
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Type Occurrence of Rakovanite

Co-type Localities:Sunday Mine, Slick Rock District, San Miguel Co., Colorado, USA
West Sunday Mine, Slick Rock District, San Miguel Co., Colorado, USA
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

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

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:
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)°
Maximum Birefringence:δ = 0.134

Chart 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:
Na
 
3
(H
 
3
V
 
10
O
 
28
) · 15H
 
2
O
Essential elements:H, Na, O, V
All elements listed in formula:H, Na, O, V
Empirical Formula:
(Na
 
2.90
K
 
0.07
Ca
 
0.01
Al
 
0.01
){H
 
2.98
[V
 
10
O
 
28
]}•15H
 
2
O

Relationship of Rakovanite to other Species

Member of:Pascoite Group
Other Members of Group:

- +
Huemulite
Na
 
4
Mg(V
 
10
O
 
28
) · 24H
 
2
O
Hummerite
K
 
2
Mg
 
2
(V
 
10
O
 
28
) · 16H
 
2
O
Lasalite
Na
 
2
Mg
 
2
(V
 
10
O
 
28
) · 20H
 
2
O
Magnesiopascoite
Ca
 
2
Mg(V
 
10
O
 
28
) · 16H
 
2
O
Pascoite
Ca
 
3
(V
 
10
O
 
28
) · 17H
 
2
O
Related Minerals - Strunz Grouping):

- +
7/0.0-Juonniite
CaMgSc(PO
 
4
)
 
2
(OH) · 4H
 
2
O
7/0.0-Kanonerovite
Na
 
3
Mn
2+
 
(P
 
3
O
 
10
) · 12H
 
2
O

Other Names for Rakovanite

Synonyms:
IMA2010-052
Other Languages:

Other Information

Health Warning: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.

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    • Localities for Rakovanite

    The 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.
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    (TL) indicates type locality. ? 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
    		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
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