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Overite

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Edwin Over
Formula:
CaMgAl(PO4)2(OH) · 4H2O
Colour:
Light apple-green to colourless; colourless in transmitted light.
Lustre:
Vitreous
Hardness:
3½ - 4
Specific Gravity:
2.53
Crystal System:
Orthorhombic
Name:
After Mr. Edwin J. Over (1903-1963) American mineral collector, Colorado Springs, Colorado, USA, who worked with Arthur Montgomery at the Fairfield locality and who discovered the first material.
Overite Group.

A secondary phosphate mineral found in altered phosphate nodules in sediments and in granitic pegmatites.


Hide all sections | Show all sections

Classification of OveriteHide

Approved, 'Grandfathered' (first described prior to 1959)
8.DH.20

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
H : With large and medium-sized cations, (OH, etc.):RO4 < 1:1
42.11.1.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O
19.8.11

19 : Phosphates
8 : Phosphates of Al and other metals

Physical Properties of OveriteHide

Vitreous
Transparency:
Translucent
Colour:
Light apple-green to colourless; colourless in transmitted light.
Hardness:
3½ - 4 on Mohs scale
Cleavage:
Perfect
On {010}, perfect; on {100}, poor.
Density:
2.53 g/cm3 (Measured)    2.51 g/cm3 (Calculated)

Optical Data of OveriteHide

Type:
Biaxial (-)
RI values:
nα = 1.568 nβ = 1.574 nγ = 1.580
2V:
Measured: 75° , Calculated: 88°
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v strong

Chemical Properties of OveriteHide

Formula:
CaMgAl(PO4)2(OH) · 4H2O

Crystallography of OveriteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Cell Parameters:
a = 14.723 Å, b = 18.746 Å, c = 7.107 Å
Ratio:
a:b:c = 0.785 : 1 : 0.379
Unit Cell V:
1,961.51 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Crystals platy to lathlike, flattened on {010} and elongated along [001]. Forms exhibited include {010}, {100}, {110}, {121}, and {021}. Commonly forms subparallel aggregates; massive.

Type Occurrence of OveriteHide

Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA: #95482. U.S. National Museum of Natural History, Washington, D.C., USA: #R7898.
Geological Setting of Type Material:
Altered phosphate nodules in sedimentary rocks.
Associated Minerals at Type Locality:

Other Language Names for OveriteHide

German:Overit
Russian:Оверит
Spanish:Overita

Relationship of Overite to other SpeciesHide

Structurally related to group(s):

Common AssociatesHide

Associated Minerals Based on Photo Data:
Gordonite1 photo of Overite associated with Gordonite on mindat.org.
Variscite1 photo of Overite associated with Variscite on mindat.org.
Crandallite1 photo of Overite associated with Crandallite on mindat.org.
Whitlockite1 photo of Overite associated with Whitlockite on mindat.org.
Groatite1 photo of Overite associated with Groatite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.DH.05MinyuliteKAl2(PO4)2(OH,F) · 4H2OOrth. mm2 : Pba2
8.DH.10LeucophosphiteKFe3+2(PO4)2(OH) · 2H2OMon. 2/m : P21/b
8.DH.10Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2OMon.
8.DH.10TinsleyiteKAl2(PO4)2(OH) · 2H2OMon.
8.DH.15Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMnMn){Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15KeckiteCaMn2+Fe3+2Fe3+2(PO4)4(OH)3(H2O)7Mon. 2/m : P2/b
8.DH.15Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2OMon.
8.DH.15Whiteite-(CaFeMg){Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
8.DH.15Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m
8.DH.15Whiteite-(MnFeMg){(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
8.DH.15Jahnsite-(MnMnMn){Mn2+}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon.
8.DH.15Kaluginite(Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2OOrth.
8.DH.15Jahnsite-(CaFeFe){Ca}{Fe2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon.
8.DH.15Jahnsite-(NaFeMg)NaFe3+Mg2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(NaMnMg){Na}{Mn3+}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMgMg){Ca}{Mg}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2O
8.DH.20Manganosegelerite(Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.20SegeleriteCa2 Mg2 Fe3+2(PO4)4(OH)2 · 8H2OOrth. mmm (2/m 2/m 2/m) : Pcca
8.DH.20WilhelmvierlingiteCaMnFe3+(PO4)2(OH) · 2H2OOrth.
8.DH.20JuonniiteCaMgSc(PO4)2(OH) · 4H2OOrth.
8.DH.25CalcioferriteCa2Fe3+2(PO4)3(OH) · 7H2OMon. 2/m : B2/b
8.DH.25KingsmountiteCa4(Fe2+,Mn2+)Al4(PO4)6(OH)4 · 12H2OMon. 2 : B2
8.DH.25MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2OMon. 2 : B2
8.DH.25ZodaciteCa4Mn2+Fe3+4(PO4)6(OH)4 · 12H2OMon.
8.DH.30ArseniosideriteCa2Fe3+3(AsO4)3O2 · 3H2OMon. 2/m : B2/b
8.DH.30KolfaniteCa2Fe3+3O2(AsO4)3 · 2H2OMon.
8.DH.30MitridatiteCa2Fe3+3(PO4)3O2 · 3H2OMon. 2/m : B2/b
8.DH.30PararobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. 2/m : P21/b
8.DH.30RobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. m : Bb
8.DH.30Sailaufite(Ca,Na,☐)2Mn3+3(AsO4)2(CO3)O2 · 3H2OMon.
8.DH.35MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2OOrth.
8.DH.35PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.35Benyacarite(H2O,K)2(Mn2+,Fe2+)2(Fe3+,Ti)2Ti(PO4)4(O,F)2 · 14H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.40XanthoxeniteCa4Fe3+2(PO4)4(OH)2 · 3H2OTric. 1 : P1
8.DH.45MahnertiteNaCu3(AsO4)2Cl · 5H2OTet. 4/mmm (4/m 2/m 2/m) : I4/mmm
8.DH.50AndyrobertsiteKCdCu5(AsO4)4(H2AsO4) · 2H2OMon.
8.DH.50CalcioandyrobertsiteKCaCu5(AsO4)4(H2AsO4) · 2H2OMon. 2/m : P21/m
8.DH.55EnglishiteK3Na2Ca10Al15(PO4)21(OH)7 · 26H2OMon. 2/m
8.DH.60BouazzeriteBi6(Mg,Co)11Fe3+14(AsO4)18(OH)4O12 · 86H2OMon. 2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

42.11.1.2SegeleriteCa2 Mg2 Fe3+2(PO4)4(OH)2 · 8H2OOrth. mmm (2/m 2/m 2/m) : Pcca
42.11.1.3Manganosegelerite(Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
42.11.1.5WilhelmvierlingiteCaMnFe3+(PO4)2(OH) · 2H2OOrth.
42.11.1.6Kaluginite(Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.8.1MontebrasiteLiAl(PO4)(OH)Tric. 1 : P1
19.8.2BrazilianiteNaAl3(PO4)2(OH)4Mon. 2/m : P2/b
19.8.3WarditeNaAl3(PO4)2(OH)4 · 2H2OTet. 4 2 2 : P41 21 2
19.8.4TancoiteLiNa2Al(PO4)(HPO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pbca
19.8.5Bertossaite(Li,Na)2(Ca,Fe2+,Mn2+)Al4(PO4)4(OH,F)4Orth.
19.8.6TinsleyiteKAl2(PO4)2(OH) · 2H2OMon.
19.8.7Taranakite(K,NH4)Al3(PO4)3(OH) · 9H2OTrig. 3m (3 2/m) : R3c
19.8.8FrancoanelliteK3Al5(PO4)2(HPO4)3 · 12H2OTrig.
19.8.9GordoniteMgAl2(PO4)2(OH)2 · 8H2OTric. 1 : P1
19.8.10AldermaniteMg5Al12(PO4)8(OH)22 · 32H2OOrth.
19.8.12MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2OMon. 2 : B2
19.8.14FoggiteCaAl(PO4)(OH)2 · H2OOrth.
19.8.15GatumbaiteCaAl2(PO4)2(OH)2 · H2OMon. 2/m : P2/m
19.8.16CrandalliteCaAl3(PO4)(PO3OH)(OH)6Trig. 3m (3 2/m) : R3m
19.8.17Matulaite(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2OMon.
19.8.19LehiiteCaAl3(PO4)(PO3OH)(OH)6
19.8.20Millisite(Na,K)CaAl6(PO4)4(OH)9 · 3H2OTet.
19.8.21EnglishiteK3Na2Ca10Al15(PO4)21(OH)7 · 26H2OMon. 2/m
19.8.22KleemaniteZnAl2(PO4)2(OH)2 · 3H2OMon.
19.8.23MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2OOrth.
19.8.24PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2OOrth. mmm (2/m 2/m 2/m) : Pbca

Other InformationHide

Notes:
Readily soluble in hot nitric acid.
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 OveriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Larsen, E.S. (1940) American Mineralogist: 25: 315.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 979-980.
Moore, P.B. (1974) I. Jahnsite, segelerite, and robertsite, three new transition metal phosphate species. II. Redefinition of overite, an isotype of segelerite. III. Isotypy of robertsite, mitridatite, and arseniosiderite. American Mineralogist (1974): 59: 48-59.
Moore, P.B. and T. Araki (1977) Overite, segelerite, and jahnsite: a study in combinatorial polymorphism. American Mineralogist: 62: 692-702.

Internet Links for OveriteHide

Localities for OveriteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • Western Australia
    • Meekatharra Shire
      • Milgun Station
Mineralogical Magazine 39, 577(1974);
Canada
 
  • Manitoba
    • Lac-du-Bonnet area
      • Bernic Lake
Canadian Mineralogist 47,1225(2009)
Portugal
 
  • Viseu District
    • Mangualde
Canadian Mineralogist 47, 1225, see 1227(2009)
USA
 
  • Nevada
    • Mineral Co.
      • Candelaria District
        • Candelaria Silver Mine
Collected by Paul Adams. EDS and XRD analyzed.
  • Utah
    • Utah Co.
      • Oquirrh Mts
        • Fairfield
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 980; UGMS Bull 117 Minerals and Mineral Localities of Utah.
Rocks & Minerals (1970): 45(11): 667-674.; Wilson, W. (2010): The Clay Canyon Variscite Mine, Fairfield Utah. Mineralogical Record. 41:321-349.
Mineral and/or Locality  
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