Magnesiopascoite
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Magnesiopascoite is a bright orange mineral with formula Ca2Mg(V10O28)·16H2O. It was discovered in the U.S. state of Utah and formally described in 2008. The mineral's name derives from its status as the magnesium analogue of pascoite.
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Magnesiopascoite | |
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General | |
Category | Vanadate minerals |
Formula (repeating unit) | Ca2Mg(V10O28)·16H2O |
IMA symbol | Mpas[1] |
Strunz classification | 4.HC.05[2] |
Dana classification | 47.3.6.3[2] |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | C2/m |
Unit cell | a = 19.8442 Å, b = 9.9353 Å, c = 10.7149 Å β = 120.305°; Z = 2 |
Identification | |
Color | Bright orange |
Twinning | None observed[2] |
Cleavage | Perfect on {001} |
Fracture | Conchoidal, curved |
Tenacity | Brittle |
Mohs scale hardness | 2.5 |
Luster | Adamantine |
Streak | Yellow |
Diaphaneity | Transparent |
Optical properties | Biaxial (-) |
Refractive index | nα = 1.769(3) nβ = 1.802(3) nγ = 1.807(3)[2] |
Birefringence | δ = 0.038[2] |
2V angle | 45° (measured) |
Dispersion | r < v, crossed[2] |
Solubility | Slowly in water Quickly in cold, dilute HCl[3] |
References | [4][5] |
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