Delindeite Mineral Data

Delindeite Mineral Data +

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General Delindeite Information

Chemical Formula:

Ba2(Na,K,[ ])3(Ti,Fe)[Ti2(O,OH)4Si4O14](H2O,OH)2

Composition:

Molecular Weight = 886.43 gm

Potassium 0.88 % K 1.06 % K₂O

Barium 30.98 % Ba 34.59 % BaO

Sodium 3.63 % Na 4.89 % Na₂O

Titanium 14.04 % Ti 23.43 % TiO₂

Aluminum 0.30 % Al 0.58 % Al₂O₃

Iron 1.89 % Fe 2.70 % Fe₂O₃

Silicon 12.36 % Si 26.44 % SiO₂

Hydrogen 0.68 % H 6.04 % H₂O

Oxygen 35.23 % O

______ ______

100.00 % 99.73 % = TOTAL OXIDE

Empirical Formula:

Na_1.4K_0.2Ba₂Ti_2.6Fe³⁺_0.3Al_0.1Si_3.9O_15.2(OH)_2.71.62(H₂O)

Environment:

Secondary mineral formed under oxidizing conditions from a titianiferous nepheline syenite.

IMA Status:

Approved IMA 1987

Locality:

Diamond Jo quarry, Magnet Cove, Hot Springs County, Arkansas, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Henry deLinde, long time mineral collector and owner of the Diamond Jo quarry.

Delindeite Image

Images:

Delindeite

Comments: pale pink acicular crystal sprays of delindeite on matrix.
Location: Diamond Jo Quarry, Hot Spring County, Arkansas, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Delindeite Crystallography

Axial Ratios:

a:b:c =0.7769:1:3.1373

Cell Dimensions:

a = 5.327, b = 6.856, c = 21.51, Z = 2; beta = 93.8° V = 783.86 Den(Calc)= 3.76

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/m

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

By Intensity(I/I_o): 10.8(1), 2.888(0.31), 3.083(0.28),3.54(0.24), 2.262(0.2), 2.806(0.2), 2.753(0.16),

Crystal Structure:

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Ferraris G , Ivaldi G , Pushcharovsky D Y , Zubkova N V , Pekov I V , The Canadian Mineralogist , 39 (2001) p.1307-1316

Physical Properties of Delindeite

Cleavage:

[001] Good

Color:

Gray pink.

Density:

3.3

Diaphaniety:

Translucent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Flakes - Flat, thin crystals or aggregates.

Luster:

Pearly

Streak:

white

Optical Properties of Delindeite

Gladstone-Dale:

CI meas= -0.126 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2302,KPDmeas= 0.2623,KC= 0.233

Optical Data:

Biaxial (+), a=1.79, b=1.825, g=1.982, bire=0.1920, 2V(Calc)=54, 2V(Meas)=54.

Calculated Properties of Delindeite

Electron Density:

r_electron=3.51 gm/cc
note: r_Delindeite=3.76 gm/cc.

Fermion Index

Fermion Index = 0.07972
Boson Index = 0.92028

Photoelectric:

PE_Delindeite= 136.56 barns/electron
U=PE_Delindeite x r_electron= 479.86 barns/cc.

Radioactivity:

GRapi = 11.88 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Delindeite - barely detectable

Delindeite Classification

Dana Class:

56.2.6c.2 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.2)with cations in [4] and/or >[4] coordination

(56.2.6c)Seidozerite - Lamprophyllite group (Lamprophyllite subgroup)

56.2.6c.1 Barytolamprophyllite Ba2Na3(Fe,Ti)3(Si2O7)2(O,OH,F)4 C 2/m 2/m

56.2.6c.2 Delindeite Ba2(Na,K,[])3(Ti,Fe)[Ti2(O,OH)4Si4O14](H2O,OH)2 A2/m 2/m

56.2.6c.3 Ericssonite BaMn2FeO[Si2O7](OH) C 2/m 2/m

56.2.6c.4 Lamprophyllite Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2 C 2/m 2/m

56.2.6c.5 Orthoericssonite BaMn2(FeO)Si2O7(OH) Pmmn 2/m 2/m 2/m

56.2.6c.6 Andremeyerite BaFe(Fe,Mn,Mg)Si2O7 P 2₁/c 2/m

56.2.6c.7 Eveslogite! (Ca,K,Na,Sr,Ba)48[(Ti,Nb,Fe,Mn)12(OH)12Si48O144](F,OH,Cl)14 P 2/m 2/m

56.2.6c.8 Nabalamprophyllite! Ba(Na,Ba){Na3Ti[Ti2O2Si4O14](OH,F)2} P 2/m 2/m

Strunz Class:

VIII/C.15-40 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.15 - Bafertisite series

VIII/C.15-10 Fresnoite Ba2TiSi2O8 P 4bm 4mm

VIII/C.15-20 Bafertisite Ba(Fe,Mn)2TiSi2O7(O,OH)2 Cm m

VIII/C.15-30 Hejtmanite Ba(Mn,Fe)2TiO(Si2O7)(OH,F)2 P 2₁/m 2/m

VIII/C.15-40 Delindeite Ba2(Na,K,[])3(Ti,Fe)[Ti2(O,OH)4Si4O14](H2O,OH)2 A2/m 2/m

Other Delindeite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2, AmMin v 87, p 999) OPTIC PROP.(AntBidBlaNic2)

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Delindeite

Ba2(Na,K,[ ])3(Ti,Fe)[Ti2(O,OH)4Si4O14](H2O,OH)2
Dana No: 56.2.6c.2 Strunz No: VIII/C.15-40
Locality:

Notes: