Ephesite Mineral Data

Ephesite Mineral Data +

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General Ephesite Information

Chemical Formula:

NaLiAl2(Al2Si2)O10(OH)2

Composition:

Molecular Weight = 388.04 gm

Sodium 5.92 % Na 7.99 % Na₂O

Lithium 1.79 % Li 3.85 % Li₂O

Aluminum 27.81 % Al 52.55 % Al₂O₃

Silicon 14.48 % Si 30.97 % SiO₂

Hydrogen 0.52 % H 4.64 % H₂O

Oxygen 49.48 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaLiAl₄Si₂O₁₀(OH)₂

Environment:

Peri-aluminous metamorphic rocks. Ca analog of muscovite.

IMA Status:

Valid Species (Pre-IMA) 1851

Locality:

Gumuchdahg, Ephesus, near Izmir, Turkey. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Ephesite Image

Images:

Ephesite Hausmannite

Comments: Flesh-colored ephesite associated with dark brownish black hausmannite.
Location: Gloucester mine. Postmasburg, Cape province. S. Africa. Scale: 5.5 x 5 cm.
© Fabre Minerals

Ephesite Crystallography

Axial Ratios:

a:b:c =0.5783:1:2.1803

Cell Dimensions:

a = 5.12, b = 8.853, c = 19.303, Z = 4; beta = 95.08° V = 871.52 Den(Calc)= 2.96

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 3.203(1), 2.523(0.9), 9.61(0.75),

Crystal Structure:

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Slade P G , Schultz P K , Dean C , Neues Jahrbuch fur Mineralogie, Monatshefte , 1987 (1987) p.275-287, Refinement of the ephesite structure in C1 symmetry, Note: polytype 2M1, Locality: Postmasburg, district, South Africa

Physical Properties of Ephesite

Cleavage:

[001] Perfect

Color:

Brownish pink, Pearl gray, Pale green.

Density:

2.984

Diaphaniety:

Translucent

Fracture:

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

Hardness:

3.5-4.5 - Between Copper Penny and Fluorite-Apatite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Ephesite

Gladstone-Dale:

CI meas= 0.046 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.039 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2077,KPDmeas= 0.206,KC= 0.216

Optical Data:

Biaxial (-), a=1.592-1.595, b=1.624-1.625, g=1.625-1.627, bire=0.0320-0.0330, 2V(Calc)=18-28, 2V(Meas)=18-28.

Calculated Properties of Ephesite

Electron Density:

r_electron=2.93 gm/cc
note: r_Ephesite=2.96 gm/cc.

Fermion Index

Fermion Index = 0.00833
Boson Index = 0.99167

Photoelectric:

PE_Ephesite= 1.48 barns/electron
U=PE_Ephesite x r_electron= 4.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ephesite is Not Radioactive

Ephesite Classification

Dana Class:

71.2.2b.16 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.2)with 2:1 Layers

(71.2.2b)Mica Group (Biotite subgroup)

71.2.2b.1 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m

71.2.2b.1a Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m

71.2.2b.1b Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m

71.2.2b.2 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m

71.2.2b.3 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m

71.2.2b.3a Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m

71.2.2b.4 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m

71.2.2b.5 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m

71.2.2b.5a Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m

71.2.2b.6 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m

71.2.2b.7 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono

71.2.2b.8 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m

71.2.2b.8a Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m

71.2.2b.8b Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono

71.2.2b.9 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

71.2.2b.10 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m

71.2.2b.11 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m

71.2.2b.12 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m

71.2.2b.13 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m

71.2.2b.14 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m

71.2.2b.15 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m

71.2.2b.16 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m

71.2.2b.17 IMA2004-049! NaMg3(AlSi3)O10(OH)2 C 2/m 2/m

Strunz Class:

VIII/H.11-130 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups

VIII/H.11 - Mica group, Biotite series

VIII/H.11-00* Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m

VIII/H.11-10 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m

VIII/H.11-20 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

VIII/H.11-30 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m

VIII/H.11-35 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m

VIII/H.11-40 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m

VIII/H.11-50 Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m

VIII/H.11-60 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m

VIII/H.11-70 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m

VIII/H.11-80 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m

VIII/H.11-90 Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m

VIII/H.11-100 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m

VIII/H.11-102 Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m

VIII/H.11-105 Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m

VIII/H.11-110 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m

VIII/H.11-120 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m

VIII/H.11-130 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m

VIII/H.11-140 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m

VIII/H.11-150 Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m

VIII/H.11-160 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m

Other Ephesite Information

References:

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

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Ephesite

NaLiAl2(Al2Si2)O10(OH)2
Dana No: 71.2.2b.16 Strunz No: VIII/H.11-130
Locality:

Notes: