Segelerite Mineral Data

Segelerite Mineral Data +

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General Segelerite Information

Chemical Formula:

CaMgFe+++(PO4)2(OH)·4(H2O)

Composition:

Molecular Weight = 399.24 gm

Calcium 10.04 % Ca 14.05 % CaO

Magnesium 6.09 % Mg 10.10 % MgO

Iron 13.99 % Fe 20.00 % Fe₂O₃

Phosphorus 15.52 % P 35.55 % P₂O₅

Hydrogen 2.27 % H 20.31 % H₂O

Oxygen 52.10 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMgFe³⁺(PO₄)₂(OH)·4(H₂O)

Environment:

Grainitc pegmatites. Fe analog of overite.

IMA Status:

Approved IMA 1974

Locality:

Tip Top pegmatite, near Custer, Custer County, South Dakota, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Curt G. Segeler (1901-1989), amateur mineralogist, New York City.

Synonym:

ICSD 10407

PDF 27-1061

Segelerite Image

Images:

Segelerite

Comments: Yellow, prismatic, striated crystal of Segelerite.
Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Segelerite Crystallography

Axial Ratios:

a:b:c =0.7906:1:0.3896

Cell Dimensions:

a = 14.826, b = 18.751, c = 7.307, Z = 8; V = 2,031.36 Den(Calc)= 2.61

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): 2.828(1), 9.31(0.9), 5.34(0.6),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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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 Segelerite

Cleavage:

[010] Perfect

Color:

Green, Chartreuse, Colorless.

Density:

2.67

Diaphaniety:

Transparent to Translucent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

4 - Fluorite

Luster:

Vitreous - Adamantine

Streak:

white

Optical Properties of Segelerite

Gladstone-Dale:

CI meas= 0.037 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.243,KPDmeas= 0.2376,KC= 0.2468

Optical Data:

Biaxial (-), a=1.618, b=1.635, g=1.65, bire=0.0320, 2V(Calc)=84, 2V(Meas)=45-70.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

yellow.

Calculated Properties of Segelerite

Electron Density:

r_electron=2.63 gm/cc
note: r_Segelerite=2.61 gm/cc.

Fermion Index

Fermion Index = 0.00944
Boson Index = 0.99056

Photoelectric:

PE_Segelerite= 6.20 barns/electron
U=PE_Segelerite x r_electron= 16.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Segelerite is Not Radioactive

Segelerite Classification

Dana Class:

42.11.1.2 (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.28-20 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 Segelerite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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

Segelerite

CaMgFe+++(PO4)2(OH)·4(H2O)
Dana No: 42.11.1.2 Strunz No: VII/D.28-20
Locality:

Notes: