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Caseyite

A valid IMA mineral species
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01973870017067423066433.jpg
Caseyite, etc.

Packrat Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA
01973870017067423066433.jpg
Caseyite, etc.

Packrat Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA
01973870017067423066433.jpg
Caseyite, etc.

Packrat Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA
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About CaseyiteHide

08813800015799845801504.jpg
William H. Casey
Formula:
[(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)
previously given as [(V5+O2)Al7.5(OH)15(H2O)13]2[H2V4+V5+9O28][V5+10O28]2·90H2O
Colour:
Yellow
Lustre:
Vitreous
Hardness:
2 - 3
Specific Gravity:
2.151 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of William H. Casey (b. 1955, San Francisco, California, USA), chemistry professor in the University of California Davis College of Letters and Science, for his work on vanadium compounds and polyoxometalates. He has made major contributions in the fields of aqueous geochemistry and inorganic solution chemistry, and has received multiple awards and medals.
New structure type. It is related to structures based on flat-Al13 polyoxometalate cation.


Unique IdentifiersHide

Mindat ID:
53574
Long-form identifier:
mindat:1:1:53574:2
GUID
(UUID V4):
e21f9704-93b5-4d0e-8945-6d5ed2367406

IMA Classification of CaseyiteHide

Classification of CaseyiteHide

Strunz-mindat (2024):
4.HC.30

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

Physical Properties of CaseyiteHide

Lustre:
Vitreous
Colour:
Yellow
Streak:
pale yellow streak
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.151 g/cm3 (Calculated)

Optical Data of CaseyiteHide

Type:
Biaxial (+)
RI values:
nα = 1.659(3) nβ = 1.670(3) nγ = 1.720(3)
2V:
Measured: 52.6° (5)
Max Birefringence:
δ = 0.061
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
Strong
Pleochroism:
Non-pleochroic

Chemistry of CaseyiteHide

Mindat Formula:
[(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)

previously given as [(V5+O2)Al7.5(OH)15(H2O)13]2[H2V4+V5+9O28][V5+10O28]2·90H2O
Elements listed:
Al, Ca, H, K, Na, O, S, V - search for minerals with similar chemistry

Crystallography of CaseyiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 14.123(8) Å, b = 31.00(1) Å, c = 21.95(1) Å
β = 97.961(8)°
Ratio:
a:b:c = 0.456 : 1 : 0.708
Unit Cell V:
9516 ų
Z:
2
Comment:
P21/n

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
17.798 Å(92)
15.499 Å(100)
12.749 Å(26)
12.620 Å(33)
10.869 Å(16)
9.332 Å(11)
9.016 Å(14)
8.899 Å(43)
Comments:
From Type Description.

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]
47h : [Near-surface oxidized, dehydrated minerals]
Stage 10b: Anthropogenic minerals<10 Ka
55 : Anthropogenic mine minerals

Type Occurrence of CaseyiteHide

Co-Type Localities:
ⓘ Packrat Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA
ⓘ Burro Mine, Slick Rock Mining District, San Miguel County, Colorado, USA
ⓘ West Sunday Mine, Slick Rock Mining District, San Miguel County, Colorado, USA
General Appearance of Type Material:
Tapering needles or blades
Place of Conservation of Type Material:
In the collections of the Natural History Museum of Los Angeles County, Los Angeles, USA, catalogue numbers 73526 (Packrat – holotype), 73527 and 73528 (Packrat –cotypes),73529 (West Sunday – cotype), 73530 and 73531 (Burro – cotypes)
Reference:
Kampf, A.R., Cooper, M.A., Hughes, J.M., Nash, B.P., Hawthorne, F.C., Marty, J. (2020) Caseyite, a new mineral containing a variant of the flat-Al13 polyoxometalate cation. American Mineralogist: 105(1): 123-131.

Synonyms of CaseyiteHide

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.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.55PostiteMg(H2O)6Al2(OH)2(H2O)8(V10O28) · 13H2O Orth. mmm (2/m 2/m 2/m) : Pccn
4.HC.60Schindlerite{(NH4)4Na2(H2O)10}{V10O28}Tric. 1 : P1

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 CaseyiteHide

References for CaseyiteHide

Localities for CaseyiteHide

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 (TL)
 
  • Colorado
    • Mesa County
      • Gateway Mining District
        • Beaver Mesa
Kampf et al. (2020)
    • San Miguel County
      • Slick Rock Mining District
Kampf et al. (2020)
Kampf et al. (2020)
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