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Magnesiopascoite

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Blue Cap Mine, Paradox Valley District, Paradox Valley, San Juan Co., Utah, USA

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Formula:
Ca
 
2
Mg(V
 
10
O
 
28
) · 16H
 
2
O
System:Monoclinic
Member of:Pascoite Group
Name:relation to pascoite, the Magnesium analogue of pascoite


Pascoite group

Classification of Magnesiopascoite

IMA status:Approved 2007
Strunz 9th edition ID:4.HC.05
Nickel-Strunz 10th (pending) edition ID:4.HC.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
C : [6]-Sorovanadates
Dana 8th edition ID:47.3.6.3

47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
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Type Occurrence of Magnesiopascoite

Type Locality:Blue Cap Mine, Paradox Valley District, Paradox Valley, San Juan Co., Utah, USA
General Appearance of Type Material:parallel stacks of lustrous crystals that vary from tabular to equant to prismatic
Place of Conservation of Type Material:Natural History Museum of Los Angeles County, California, USA, (catalog numbers 58610 and 58611; the same type specimens as martyite)
Associated Minerals at type locality:
RossitePyriteMontroseiteMartyiteGypsum

Crystallography of Magnesiopascoite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m {B1 1 2/m} {C2/m} {C1 2/m 1}
Cell Parameters:a = 19.8442Å, b = 9.9353Å, c = 10.7149Å
β = 120.305°
Ratio:a:b:c = 1.997 : 1 : 1.078
Unit Cell Volume:V 1823.9 ų
Z:2
Morphology:crystals vary in aspect from tabular to equant to prismatic. {001} prominent. Other forms include {302}, {401}, {112}, {113}, {11-1}, {11-2}, {22-3}, and {33-1)
Twinning:none observed
X-Ray Powder Diffraction:
d-spacingIntensity
9.242 (20)
8.872 (30)
8.571 (100)
7.270 (40)
5.477 (15)
4.590 (15)
4.355 (15)
2.137 (20)

Optical Data of Magnesiopascoite

Type:Biaxial (-)
RI values: nα = 1.769(3) nβ = 1.802(3) nγ = 1.807(3)
2V:Measured: 45° (5)
Maximum Birefringence:δ = 0.038

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r < v, crossed
Comments:Y (orange) > X (yellow, Z (yellow)

Chemical Properties of Magnesiopascoite

Formula:
Ca
 
2
Mg(V
 
10
O
 
28
) · 16H
 
2
O
Essential elements:Ca, H, Mg, O, V
All elements listed in formula:Ca, H, Mg, O, V

Relationship of Magnesiopascoite 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
Pascoite
Ca
 
3
(V
 
10
O
 
28
) · 17H
 
2
O
Rakovanite
Na
 
3
(H
 
3
V
 
10
O
 
28
) · 15H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
4.HC.05Pascoite
Ca
 
3
(V
 
10
O
 
28
) · 17H
 
2
O
4.HC.05Lasalite
Na
 
2
Mg
 
2
(V
 
10
O
 
28
) · 20H
 
2
O
4.HC.10Hummerite
K
 
2
Mg
 
2
(V
 
10
O
 
28
) · 16H
 
2
O
4.HC.15Sherwoodite
Ca
 
4.5
(AlV
4+
2
V
5+
12
O
 
40
) · 28H
 
2
O

Other Names for Magnesiopascoite

Synonyms:
IMA2007-025
Other Languages:
Simplified Chinese:镁橙钒钙石

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 Magnesiopascoite

Reference List:

- +
Kampf, A.R. & I.M. Steele: Magnesiopascoite, a new member of the pascoite group: description and crystal structure. Canadian Mineralogist 46,679-686(2008)

Internet Links for Magnesiopascoite

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    • Localities for Magnesiopascoite

    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
     
    • Utah
      • San Juan Co.
        • Paradox Valley
          • Paradox Valley District
    		Can.Min.46,679-686(2008)
            • La Sal Creek Canyon
    		Can.Min. 46,679-686(2008)
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