Overite Mineral Data

Overite Mineral Data +

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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)

IMA Status:

Valid Species (Pre-IMA) 1940

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 10406

PDF 16-157

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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),

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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

Diaphaniety:

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

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:

r_electron=2.57 gm/cc
note: r_Overite=2.53 gm/cc.

Fermion Index

Fermion Index = 0.00698
Boson Index = 0.99302

Photoelectric:

PE_Overite= 2.51 barns/electron
U=PE_Overite x r_electron= 6.46 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Overite is Not Radioactive

Overite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.1)Dana Group

42.11.1.1 Overite CaMgAl(PO4)2(OH)·4(H2O) Pcca 2/m 2/m 2/m

42.11.1.2 Segelerite CaMgFe(PO4)2(OH)·4(H2O) Pcca 2/m 2/m 2/m

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

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

42.11.1.5 Wilhelmvierlingite CaMnFe(PO4)2(OH)·2(H2O) P bca 2/m 2/m 2/m

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

42.11.1.7 Juonniite! CaMgSc(PO4)2(OH)·4(H2O) P bca 2/m 2/m 2/m

Strunz Class:

VII/D.28-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.28 - Overite- Segelerite group

VII/D.28-10 Overite CaMgAl(PO4)2(OH)·4(H2O) Pcca 2/m 2/m 2/m

VII/D.28-20 Segelerite CaMgFe(PO4)2(OH)·4(H2O) Pcca 2/m 2/m 2/m

VII/D.28-25 Juonniite! CaMgSc(PO4)2(OH)·4(H2O) P bca 2/m 2/m 2/m

VII/D.28-30 Wilhelmvierlingite CaMnFe(PO4)2(OH)·2(H2O) P bca 2/m 2/m 2/m

VII/D.28-40 Lunokite (Mn,Ca)(Mg,Fe,Mn)Al(PO4)2(OH)·4(H2O) P bca 2/m 2/m 2/m

VII/D.28-50 Manganosegelerite (Mn,Ca)(Mn,Fe,Mg)Fe(PO4)2(OH)·4(H2O) P bca 2/m 2/m 2/m

Other Overite Information

References:

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

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

Overite

CaMgAl(PO4)2(OH)·4(H2O)
Dana No: 42.11.1.1 Strunz No: VII/D.28-10
Locality:

Notes: