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Postite

A valid IMA mineral species
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About PostiteHide

01891400014947629214043.jpg
Jeffrey Post
Formula:
Mg(H2O)6Al2(OH)2(H2O)8(V10O28) · 13H2O
Colour:
golden yellow
Lustre:
Sub-Adamantine
Hardness:
2
Specific Gravity:
2.226 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of Dr. Jeffrey E. Post (b.1954), mineralogist and curator of the Smithsonian Institution mineral and gem collections.
This page provides mineralogical data about Postite.


Unique IdentifiersHide

Mindat ID:
42268
Long-form identifier:
mindat:1:1:42268:8
GUID
(UUID V4):
4e7a766c-ce8f-42b3-afc5-3b1fc1b7df84

IMA Classification of PostiteHide

Classification of PostiteHide

4.HC.55

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
PosIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of PostiteHide

Sub-Adamantine
Transparency:
Transparent
Colour:
golden yellow
Streak:
yellow
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
one good cleavage on {001} and at least two perfect cleavages parallel to [001], possibly on {100} and {010}
Parting:
none
Fracture:
Splintery
Density:
2.226 g/cm3 (Calculated)
Comment:
density of postite could not be measured because the mineral dissolves in an aqueous sodium polytungstate solution

Optical Data of PostiteHide

Type:
Biaxial (+)
RI values:
nα = 1.727(3) nβ = 1.733(3) nγ = 1.745(3)
2V:
Calculated: 71°
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
not observed
Pleochroism:
Non-pleochroic

Chemistry of PostiteHide

Mindat Formula:
Mg(H2O)6Al2(OH)2(H2O)8(V10O28) · 13H2O

Crystallography of PostiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pccn
Setting:
Pccn
Cell Parameters:
a = 16.3357(6) Å, b = 24.2434(17) Å, c = 11.7343(4) Å
Ratio:
a:b:c = 0.674 : 1 : 0.484
Unit Cell V:
4,647.17 ų (Calculated from Unit Cell)
Z:
4

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0019040PostiteKampf 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 45-532012La Sal Mining District, Utah, USA0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.937 Å(100)
12.190 Å(90)
3.771 Å(24)
8.248 Å(22)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47e : [Vanadates, chromates, manganates]
Stage 10b: Anthropogenic minerals<10 Ka
55 : Anthropogenic mine minerals

Type Occurrence of PostiteHide

General Appearance of Type Material:
very thin, needle-like prisms with pyramidal terminations; some needles are slightly curved. Crystals generally occur in parallel bundles and grow in divergent and “jackstraw” masses. Individual crystals are up to 1 mm long and 50 µm in diameter.
Place of Conservation of Type Material:
Natural History Museum of Los Angeles County under catalogue numbers 63564 (Vanadium Queen mine) and 63563 (Blue Cap mine).
Geological Setting of Type Material:
forms from the oxidation of montroseite-corvusite assemblages in a moist environment.
Associated Minerals at Type Locality:
Reference:
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(1): 45-53.

Synonyms of PostiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Postite associated with Montroseite(V3+,Fe3+)O(OH)
1 photo of Postite associated with Corvusite(Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2O

Related Minerals - Strunz-mindat GroupingHide

4.HC.BeckettiteCa2V6Al6O20Tric. 1 : P1
4.HC.Ammoniolasalite(NH4)2Mg2(H2O)20] [V10O28]Mon. 2/m : B2/b
4.HC.Protocaseyite[Al4(OH)6(H2O)12][V10O28] · 8H2OTric. 1 : P1
4.HC.05PascoiteCa2Ca(V10O28) · 17H2OMon. 2 : B2
4.HC.05LasaliteNa2Mg2(V10O28) · 20H2OMon. 2/m : B2/b
4.HC.05MagnesiopascoiteCa2Mg(V10O28) · 16H2OMon. 2/m : B2/m
4.HC.05Rakovanite(NH4)3Na3(V10O28) · 12H2OMon. 2/m
4.HC.05HughesiteNa3Al(V10O28) · 22H2OTric. 1 : P1
4.HC.05HydropascoiteCa3(V10O28) · 24H2OTric. 1 : P1
4.HC.10HummeriteK2Mg2(V10O28) · 16H2OTric. 1 : P1
4.HC.15SherwooditeCa5.5(AlV4+V5+12O39) · 28H2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd
4.HC.20BluestreakiteK4Mg2(V4+2V5+8O28) · 14H2OMon. 2/m
4.HC.25Wernerbaurite{(NH4)2[Ca2(H2O)14](H2O)2}{V10O28}Tric. 1 : P1
4.HC.25BurroiteCa2(NH4)2(V10O28) · 15H2OTric. 1 : P1
4.HC.30Caseyite[(V5+O2)Al10-x(OH)20-2x(H2O)18-2x]2[H2V4+V5+9O28][V5+10O28]2(Na,K,Ca)2-y(SO4)2-z · (60+8x+y+4z)H2O (x = 0-2.5; y = 0-2; z = 0-2)Mon.
4.HC.35GunteriteNa4Ca(V10O28) · 20H2O Mon. 2/m : B2/m
4.HC.40KokinositeNa2Ca2(V10O28) · 24H2OTric. 1 : P1
4.HC.45NashiteNa3Ca2[(V5+9V4+)O28] · 24H2O Mon. 2/m : P21/m
4.HC.50OkieiteMg3[V10O28] · 28H2OTric. 1 : P1
4.HC.60Schindlerite{(NH4)4Na2(H2O)10}{V10O28}Tric. 1 : P1

Fluorescence of PostiteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for PostiteHide

References for PostiteHide

Localities for PostiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
USA
 
  • Colorado
    • Mesa County
      • Gateway Mining District
        • Beaver Mesa
Kampf et al. (2017)
  • Utah
    • Grand County
      • Gateway Mining District
        • Polar Mesa
Collected by and in the collection of ...
    • San Juan County
      • La Sal Creek Mining District
Collected By Chuck Adan
Williams et al. (2011) +1 other reference
Williams et al. (2011) +1 other reference
      • La Sal Mining District
Joe Marty Collection
 
Mineral and/or Locality  
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