Hiortdahlite Mineral Data

General Hiortdahlite Information

Chemical Formula:

(Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2

Composition:

Molecular Weight = 371.93 gm

Sodium 5.56 % Na 7.50 % Na₂O

Calcium 21.55 % Ca 30.16 % CaO

Yttrium 2.39 % Y 3.04 % Y₂O₃

Zirconium 14.72 % Zr 19.88 % ZrO₂

Titanium 1.29 % Ti 2.15 % TiO₂

Silicon 15.10 % Si 32.31 % SiO₂

Hydrogen 0.05 % H 0.48 % H₂O

Oxygen 32.69 % O

Fluorine 6.64 % F 6.64 % F

- % F -2.80 % -O=F₂

______ ______

100.00 % 99.35 % = TOTAL OXIDE

Empirical Formula:

Ca₂Na_0.9Y_0.1Zr_0.6Ti_0.1(Si₂O₇)F_1.3O_0.4(OH)_0.2

Environment:

Rare mineral in alkalic rocks, their pegmatites and metamorphosed equivalents and miarolitic cavities in sanidinites.

IMA Status:

Valid Species (Pre-IMA) 1889

Locality:

Mittel Aro, Lille Aro, and Stokko Islands, Norway. Link to MinDat.org Location Data.

Name Origin:

Named for prof. Thorstein Hallager Hiortdahl (1839-1925), Mineralogist of Christiania (now Olso), Norway.

Name Pronunciation:

Hiortdahlite + Pronunciation

Hiortdahlite Image

Images:

Hiortdahlite

Comments: Yellow translucent crystals of hiortdahlite in syenite matrix.
Location: Norra Karr, Granna, Jonkoping, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hiortdahlite Crystallography

Axial Ratios:

a:b:c =1.0601:1:0.7109

Cell Dimensions:

a = 10.93, b = 10.31, c = 7.33, Z = 4; alpha = 90.32°, beta = 109.03°, gamma = 90.08° V = 780.85 Den(Calc)= 3.16

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 2.87(1), 3(0.9), 3.28(0.45),

Physical Properties of Hiortdahlite

Cleavage:

{110} Distinct, {110} Distinct

Color:

Brown, Colorless, Yellow brown, Honey yellow, Light yellow.

Density:

3.267

Diaphaneity:

Transparent to Translucent

Fracture:

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

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5.5 - Knife Blade

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Hiortdahlite

Gladstone-Dale:

CI meas= 0.025 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2068,KPDmeas= 0.2,KC= 0.2051
Ncalc = 1.65 - 1.67

Optical Data:

Biaxial (+), a=1.639-1.658, b=1.643-1.664, g=1.646-1.671, bire=0.0070-0.0130, 2V(Calc)=80-86, 2V(Meas)=80. Dispersion r < v strong.

Pleochroism (x):

nearly colorless.

Pleochroism (y):

bright yellow.

Pleochroism (z):

wine yellow.

Calculated Properties of Hiortdahlite

Electron Density:

Bulk Density (Electron Density)=3.07 gm/cc
note: Specific Gravity of Hiortdahlite =3.16 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Hiortdahlite= 25.99 barns/electron
U=PE_Hiortdahlite x rElectron Density= 79.79 barns/cc.

Radioactivity:

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

Hiortdahlite Classification

Dana Class:

56.02.04.07 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

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

(56.02.04)Cuspidine - Wohlerite group

56.02.04.01 Baghdadite Ca3(Zr,Ti)Si2O9 P 2₁/a 2/m

56.02.04.02 Burpalite Na2CaZrSi2O7F2 P 2₁/a 2/m

56.02.04.03 Cuspidine Ca4Si2O7(F,OH)2 P 2₁/c 2/m

56.02.04.04 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 2₁/a 2/m

56.02.04.05 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 2₁/m 2/m

56.02.04.06 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m

56.02.04.07 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1

56.02.04.08 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1

56.02.04.09 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1

56.02.04.10 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 2₁/n 2/m

56.02.04.11 Jennite Ca9Si6O18(OH)6•8H2O P1 1

56.02.04.12 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2•3.5(H2O) Unk Ortho

56.02.04.13 Natrokomarovite* Na6CaNb6[Si4O12F2•4(H2O) C mmm 2/m 2/m 2/m

56.02.04.14 Suolunite Ca2Si2O5(OH)2•(H2O) F dd2 mm2

56.02.04.15 Mongolite Ca4Nb6Si5O24(OH)10•5(H2O) Unk Tetra

56.02.04.16 Kristiansenite! Ca2ScSn(Si2O7)(Si2O6OH) C1 1

56.02.04.17 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1

56.02.04.18 Marianoite! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 2₁ 2/m

Strunz Class:

09.BE.17 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BE -Si2O7 groups with additional anions;

09.BE.17 Baghdadite Ca3(Zr,Ti)Si2O9 P 2₁/a 2/m

09.BE.17 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 2₁/n 2/m

09.BE.17 Burpalite Na2CaZrSi2O7F2 P 2₁/a 2/m

09.BE.17 Cuspidine Ca4Si2O7(F,OH)2 P 2₁/c 2/m

09.BE.17 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1

09.BE.17 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 2₁/a 2/m

09.BE.17 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m

09.BE.17 Normandite! NaCa(Mn,Fe)(Ti,Nb,Zr)Si2O7(O,F)2 P 2₁/a 2/m

09.BE.17 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 2₁/m 2/m

09.BE.17 Marianoite! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 2₁ 2/m

Other Hiortdahlite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

See Also:

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

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Hiortdahlite

(Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2
Dana No: 56.02.04.07 Strunz No: 09.BE.17
Locality:

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