Segelerite Mineral Data

[Mineral Forums] [Minerals for Sale] [About Us] [En Espanol] [Mineral Gallery]
Fabre Minerals - Europe's first Internet mineral dealer, on the web since 1996

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.

Name Pronunciation:

Segelerite + Pronunciation

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaneity:

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
Ncalc = 1.64 - 1.66

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:

Bulk Density (Electron Density)=2.63 gm/cc
note: Specific Gravity of Segelerite =2.61 gm/cc.

Fermion Index:

Fermion Index = 0.0094423091
Boson Index = 0.9905576909

Photoelectric:

PE_Segelerite= 6.20 barns/electron
U=PE_Segelerite x rElectron Density= 16.29 barns/cc.

Radioactivity:

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

Segelerite Classification

Dana Class:

42.11.01.02 (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 Segelerite Information

References:

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

See Also:

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

Search for Segelerite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Segelerite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Segelerite Mineral Data :

Ask about Segelerite 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 Segelerite Specimen Label here :

Segelerite

CaMgFe+++(PO4)2(OH)•4(H2O)
Dana No: 42.11.01.02 Strunz No: 08.DH.20
Locality:

Notes: