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Ca2MgV105+O28 · 16H2O
Member of:
relation to pascoite, the Magnesium analogue of pascoite
Pascoite group

Classification of Magnesiopascoite

Approval Year:

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

3 : Hydrated Normal Vanadium Oxysalts

Optical Data of Magnesiopascoite

Biaxial (-)
RI values:
nα = 1.769(3) nβ = 1.802(3) nγ = 1.807(3)
Measured: 45° (5)
Max Birefringence:
δ = 0.038
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
r < v, crossed
Y (orange) > X (yellow, Z (yellow)

Chemical Properties of Magnesiopascoite

IMA Formula:
Ca2MgV105+O28 · 16H2O
Elements listed in formula:

Crystallography of Magnesiopascoite

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 19.8442 Å, b = 9.9353 Å, c = 10.7149 Å
β = 120.305°
a:b:c = 1.997 : 1 : 1.078
Unit Cell Volume:
V 1823.9 ų
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)
none observed
X-Ray Powder Diffraction Data:
9.242 (20)
8.872 (30)
8.571 (100)
7.270 (40)
5.477 (15)
4.590 (15)
4.355 (15)
2.137 (20)

Type Occurrence of Magnesiopascoite

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:

Relationship of Magnesiopascoite to other Species

Member of:
Other Members of Group:
HuemuliteNa4Mg(V10O28) · 24H2O
HummeriteK2Mg2(V10O28) · 16H2O
LasaliteNa2Mg2(V10O28) · 20H2O
PascoiteCa3(V10O28) · 17H2O
RakovaniteNa3(H3V10O28) · 15H2O
4.HC.05PascoiteCa3V105+O28 · 17H2O
4.HC.05LasaliteNa2Mg2(V10O28) · 20H2O
4.HC.10HummeriteKMgV55+O14 · 8H2O
4.HC.15SherwooditeCa4.5AlV24+V125+O40 · 28H2O

Other Names for Magnesiopascoite

Name in Other Languages:
Simplified Chinese:镁橙钒钙石

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 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 URL:
Please feel free to link to this page.
The following Magnesiopascoite specimens are currently listed for sale on

Localities for Magnesiopascoite

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.
(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.
  • 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.
      • Gypsum Valley
Nikischer, Tony, Mineral News, February, 2015
  • Utah
    • San Juan Co.
      • La Sal District (Paradox Valley District)
        • La Sal
Canadian Mineralogist 46,679-686(2008)
        • Lion Canyon
Canadian Mineralogist46,679-686(2008); 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
Gunnar Farber
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