Overite Mineral Data

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Excalibur Mineral Corp. 1885 Seminole Trail - Suite 202 Charlottesville, VA 22901-1160 USA

General Overite Information

Chemical Formula:

CaMgAl(PO4)2(OH)•4(H2O)

Composition:

Molecular Weight = 370.38 gm

Calcium 10.82 % Ca 15.14 % CaO

Magnesium 6.56 % Mg 10.88 % MgO

Aluminum 7.28 % Al 13.76 % Al₂O₃

Phosphorus 16.73 % P 38.32 % P₂O₅

Hydrogen 2.45 % H 21.89 % H₂O

Oxygen 56.16 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMgAl(PO₄)₂(OH)•4(H₂O)

Environment:

In phosphate nodules.

IMA Status:

Valid Species (Pre-IMA) 1940

Locality:

Little Green Monster mine, Clay Canyon, about nine km west of Fairfield, Utah Co., Utah, USA Link to MinDat.org Location Data.

Name Origin:

Named for Edwin J. Over (1903-1963), mineral collector, Colorado Springs, Colorado, USA, who first found the mineral.

Name Pronunciation:

Overite

Synonym:

ICSD 10406

PDF 16-157

Overite Image

Images:

Overite

Comments: Clear, pale yellow prismatic crystals of overite deep inside a crandallite vug.
Location: Clay Canyon, Fairfield, Oquirrh Mts, Utah Co., Utah, USA. Scale: Picture Size 2.5 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Overite Crystallography

Axial Ratios:

a:b:c =0.787:1:0.3801

Cell Dimensions:

a = 14.78, b = 18.78, c = 7.14, Z = 8; V = 1,981.84 Den(Calc)= 2.48

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcca

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.832(1), 9.4(0.8), 5.29(0.6),

Forms:

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Forms: ( 0 2 1) ( 0 1 0) ( 1 2 1) ( 1 1 0) ( 1 0 0)

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Crystal Structure:

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Moore P B , Araki T , American Mineralogist , 62 (1977) p.692-702, Overite, segelerite, and jahnsite: a study in combinatorial polymorphism

Physical Properties of Overite

Cleavage:

{010} Perfect, {100} Indistinct

Color:

Colorless, Light green.

Density:

2.53

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Overite

Gladstone-Dale:

CI meas= -0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2315,KPDmeas= 0.2269,KC= 0.2266
Ncalc = 1.56 - 1.57

Optical Data:

Biaxial (-), a=1.568, b=1.574, g=1.58, bire=0.0120, 2V(Calc)=88, 2V(Meas)=75.

Calculated Properties of Overite

Electron Density:

Bulk Density (Electron Density)=2.57 gm/cc
note: Specific Gravity of Overite =2.53 gm/cc.

Fermion Index:

Fermion Index = 0.0069815652
Boson Index = 0.9930184348

Photoelectric:

PE_Overite= 2.51 barns/electron
U=PE_Overite x rElectron Density= 6.46 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Overite is Not Radioactive

Overite Classification

Dana Class:

42.11.01.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.01)Overite Group

42.11.01.01 Overite CaMgAl(PO4)2(OH)•4(H2O) Pcca 2/m 2/m 2/m

42.11.01.02 Segelerite CaMgFe(PO4)2(OH)•4(H2O) Pcca 2/m 2/m 2/m

42.11.01.03 Manganosegelerite (Mn,Ca)(Mn,Fe,Mg)Fe(PO4)2(OH)•4(H2O) P bca 2/m 2/m 2/m

42.11.01.04 Lunokite (Mn,Ca)(Mg,Fe,Mn)Al(PO4)2(OH)•4(H2O) P bca 2/m 2/m 2/m

42.11.01.05 Wilhelmvierlingite CaMnFe(PO4)2(OH)•2(H2O) P bca 2/m 2/m 2/m

42.11.01.06 Kaluginite* (Mn,Ca)MgFe(PO4)2(OH)•4(H2O) C cca 2/m 2/m 2/m

42.11.01.07 Juonniite! CaMgSc(PO4)2(OH)•4(H2O) P bca 2/m 2/m 2/m

Strunz Class:

08.DH.20 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1

08.DH.20 Manganosegelerite (Mn,Ca)(Mn,Fe,Mg)Fe(PO4)2(OH)•4(H2O) P bca 2/m 2/m 2/m

08.DH.20 Juonniite! CaMgSc(PO4)2(OH)•4(H2O) P bca 2/m 2/m 2/m

08.DH.20 Overite CaMgAl(PO4)2(OH)•4(H2O) Pcca 2/m 2/m 2/m

08.DH.20 Segelerite CaMgFe(PO4)2(OH)•4(H2O) Pcca 2/m 2/m 2/m

08.DH.20 Wilhelmvierlingite CaMnFe(PO4)2(OH)•2(H2O) P bca 2/m 2/m 2/m

Other Overite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Overite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Overite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Overite Specimen Label here :

Overite

CaMgAl(PO4)2(OH)•4(H2O)
Dana No: 42.11.01.01 Strunz No: 08.DH.20
Locality:

Notes: