Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Overite

This page is currently not sponsored. Click here to sponsor this page.
Edwin Over
Formula:
CaMgAl(PO4)2(OH) · 4H2O
System:
Orthorhombic
Colour:
Light apple-green to ...
Hardness:
3½ - 4
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.

Classification of Overite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
mindat.org URL:
http://www.mindat.org/min-3048.html
Please feel free to link to this page.

First Recorded Occurrence of Overite

Place of Conservation of First Recorded Material:
Harvard University, Cambridge, Massachusetts, USA: #95482. U.S. National Museum of Natural History, Washington, D.C., USA: #R7898.
Year of Discovery:
1938
Geological Setting of First Recorded Material:
Altered phosphate nodules in sedimentary rocks.
Associated Minerals at First Recorded Locality:

Occurrences of Overite

Geological Setting:
Complex granitic pegmatite.

Physical Properties of Overite

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

Crystallography of Overite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Cell Parameters:
a = 14.723Å, b = 18.746Å, c = 7.107Å
Ratio:
a:b:c = 0.785 : 1 : 0.379
Unit Cell Volume:
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.

Optical Data of Overite

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 Overite

Formula:
CaMgAl(PO4)2(OH) · 4H2O
Essential elements:
All elements listed in formula:

Relationship of Overite to other Species

Structurally related to group(s):
8.DH.05MinyuliteKAl2(PO4)2(OH,F) · 4H2O
8.DH.10LeucophosphiteKFe23+(PO4)2(OH) · 2H2O
8.DH.10Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2O
8.DH.10TinsleyiteKAl2(PO4)2(OH) · 2H2O
8.DH.15Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMnMn){Ca}{Mn2+}{Mn22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15KeckiteCaMn2+Fe23+Fe23+(PO4)4(OH)3(H2O)7
8.DH.15Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(CaFeMg){Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(MnFeMg){(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(MnMnMn){Mn2+}{Mn2+}{Mn22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Kaluginite(Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2O
8.DH.15Jahnsite-(CaFeFe){Ca}{Fe2+}{Fe22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(NaFeMg)NaFe3+Mg2Fe23+(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(NaMnMg){Na}{Mn3+}{Mg2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMgMg){Ca}{Mg}{Mg2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.20Manganosegelerite(Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2O
8.DH.20SegeleriteCa2 Mg2 Fe23+(PO4)4(OH)2 · 8H2O
8.DH.20WilhelmvierlingiteCaMnFe3+(PO4)2(OH) · 2H2O
8.DH.20JuonniiteCaMgSc(PO4)2(OH) · 4H2O
8.DH.25CalcioferriteCa2Fe23+(PO4)3(OH) · 7H2O
8.DH.25KingsmountiteCa4(Fe2+,Mn2+)Al4(PO4)6(OH)4 · 12H2O
8.DH.25MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
8.DH.25ZodaciteCa4Mn2+Fe43+(PO4)6(OH)4 · 12H2O
8.DH.30ArseniosideriteCa2Fe33+(AsO4)3O2 · 3H2O
8.DH.30KolfaniteCa2Fe23+(AsO4)3O2 · 2H2O
8.DH.30MitridatiteCa2Fe33+(PO4)3O2 · 3H2O
8.DH.30PararobertsiteCa2Mn33+(PO4)3O2 · 3H2O
8.DH.30RobertsiteCa3Mn43+(PO4)3O2 · 3H2O
8.DH.30Sailaufite(Ca,Na,☐)2Mn33+(AsO4)2(CO3)O2 · 3H2O
8.DH.35MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2O
8.DH.35PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2O
8.DH.35Benyacarite(H2O,K)2(Mn2+,Fe2+)2(Fe3+,Ti)2Ti(PO4)4(O,F)2 · 14H2O
8.DH.40XanthoxeniteCa4Fe23+(PO4)4(OH)2 · 3H2O
8.DH.45MahnertiteNaCu3(AsO4)2Cl · 5H2O
8.DH.50AndyrobertsiteKCdCu5(AsO4)4(H2AsO4) · 2H2O
8.DH.50CalcioandyrobertsiteKCaCu5(AsO4)4(H2AsO4) · 2H2O
8.DH.55EnglishiteK3Na2Ca10Al15(PO4)21(OH)7 · 26H2O
8.DH.60BouazzeriteBi6(Mg,Co)11Fe143+(AsO4)18(OH)4O12 · 86H2O
19.8.1MontebrasiteLiAl(PO4)(OH)
19.8.2BrazilianiteNaAl3(PO4)2(OH)4
19.8.3WarditeNaAl3(PO4)2(OH)4 · 2H2O
19.8.4TancoiteLiNa2Al(PO4)(HPO4)(OH)
19.8.5Bertossaite(Li,Na)2(Ca,Fe2+,Mn2+)Al4(PO4)4(OH,F)4
19.8.6TinsleyiteKAl2(PO4)2(OH) · 2H2O
19.8.7Taranakite(K,NH4)Al3(PO4)3(OH) · 9H2O
19.8.8FrancoanelliteK3Al5(PO4)2(HPO4)3 · 12H2O
19.8.9GordoniteMgAl2(PO4)2(OH)2 · 8H2O
19.8.10AldermaniteMg5Al12(PO4)8(OH)22 · 32H2O
19.8.12MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
19.8.14FoggiteCaAl(PO4)(OH)2 · H2O
19.8.15GatumbaiteCaAl2(PO4)2(OH)2 · H2O
19.8.16CrandalliteCaAl3(PO4)2(OH)5 · H2O
19.8.17Matulaite(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O
19.8.19Lehiite
19.8.20Millisite(Na,K)CaAl6(PO4)4(OH)9 · 3H2O
19.8.21EnglishiteK3Na2Ca10Al15(PO4)21(OH)7 · 26H2O
19.8.22KleemaniteZnAl2(PO4)2(OH)2 · 3H2O
19.8.23MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2O
19.8.24PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2O

Other Names for Overite

Name in Other Languages:
German:Overit
Russian:Оверит
Spanish:Overita

Other Information

Other Information:
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 Overite

Reference List:
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 Overite

Localities for Overite

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.
Australia
 
  • Western Australia
    • Meekatharra Shire
      • Milgun Station
Min.Mag. 39, 577(1974);
Canada
 
  • Manitoba
    • Lac-du-Bonnet area
      • Bernic Lake
Can. Min. 47,1225(2009)
Portugal
 
  • Viseu District
    • Mangualde
Can.Min. 47, 1225, see 1227(2009)
USA
 
  • 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  
Copyright © mindat.org 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: January 31, 2015 17:48:46 Page generated: January 30, 2015 17:59:37