Kristiansenite Mineral Data

Kristiansenite Mineral Data

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General Kristiansenite Information

Chemical Formula:

Ca2ScSn(Si2O7)(Si2O6OH)

Composition:

Molecular Weight = 291.23 gm

Sodium 0.32 % Na 0.43 % Na₂O

Calcium 13.21 % Ca 18.49 % CaO

Zirconium 0.31 % Zr 0.42 % ZrO₂

Scandium 5.25 % Sc 8.05 % Sc₂O₃

Aluminum 0.19 % Al 0.35 % Al₂O₃

Iron 1.34 % Fe 1.73 % FeO

Silicon 19.09 % Si 40.85 % SiO₂

Tin 21.60 % Sn 27.43 % SnO₂

Hydrogen 0.23 % H 2.04 % H₂O

Oxygen 38.46 % O

______ ______

100.00 % 99.78 % = TOTAL OXIDE

Empirical Formula:

Ca_0.96Na_0.04Sn_0.53Sc_0.34Fe²⁺_0.07Al_0.02Zr_0.01Si_1.98O_6.34(OH)_0.66

Environment:

Late-stage hydrothermal mineral in a granite pegmatite.

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Heftejern, Tørdal, Telemark, Norway. Link to MinDat.org Location Data.

Name Origin:

Named for Roy Kristiansen (1943-), amateur mineralogist who first observed the mineral.

Synonym:

IMA2000-051

Kristiansenite Image

Images:

Kristiansenite

Comments: Two very nice, clear, intergrown crystals of kristiansenite in pinkish matrix.
Location: Heftetjern pegmatite, T?rdal, Drangedal, Telemark, Norway. Scale: Crystal size 1 mm.
© Tom Loomis / Dakota Matrix

Kristiansenite Crystallography

Axial Ratios:

a:b:c =1.1926:1:1.5864

Cell Dimensions:

a = 10.028, b = 8.408, c = 13.339, Z = 8; alpha = 90.01°, beta = 109.1°, gamma = 90° V = 1,062.77 Den(Calc)= 3.64

Crystal System:

Triclinic - PedialH-M Symbol (1) Space Group: C1

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

By Intensity(I/I_o): 3.146(1)(004), 3.089(0.63)(222), 5.18(0.53)(111),2.595(0.34)(222), 2.901(0.19)(221), 2.142(0.17)(331),

Physical Properties of Kristiansenite

Color:

Colorless, White.

Density:

3.3

Diaphaniety:

Translucent to transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Habit:

Tabular - Form dimensions are thin in one direction.

Habit:

Tapered - Crystals are noticably tapered from one end to the other.

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Kristiansenite

Gladstone-Dale:

CI meas= -0.142 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2033,KPDmeas= 0.2242,KC= 0.1963

Optical Data:

Biaxial (?), b=1.74

Calculated Properties of Kristiansenite

Electron Density:

r_electron=3.50 gm/cc
note: r_{Kristiansenite}=3.64 gm/cc.

Fermion Index

Fermion Index = 0.04582
Boson Index = 0.95418

Photoelectric:

PE_{Kristiansenite}= 65.85 barns/electron
U=PE_{Kristiansenite} x r_electron= 230.67 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kristiansenite is Not Radioactive

Kristiansenite Classification

Dana Class:

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

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

(56.2.4)Cuspidine - Wohlerite group

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

56.2.4.2 Burpalite Na2CaZrSi2O7F2 P 2₁/a 2/m

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

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

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

56.2.4.6 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m

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

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

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

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

56.2.4.11 Jennite Ca9Si6O18(OH)6·8H2O P1 1

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

56.2.4.13 Na-komarovite? Na6CaNb6[Si4O12F2·4(H2O) C mmm 2/m 2/m 2/m

56.2.4.14 Suolunite Ca2Si2O5(OH)2·(H2O) F dd2 mm2

56.2.4.15 Mongolite Ca4Nb6Si5O24(OH)10·5(H2O) Unk Tetra

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

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

Strunz Class:

VIII/C.01-18 VIII - Silicates

VIII/C - Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders

VIII/C.01 - Thortveitite - Rowlandite-(Y) series

VIII/C.01-10 Thortveitite (Sc,Y)2Si2O7 C 2/m 2/m

VIII/C.01-15 Gittinsite CaZrSi2O7 C 2/m 2/m

VIII/C.01-18 Kristiansenite Ca2ScSn(Si2O7)(Si2O6OH) C1 1

VIII/C.01-20 Keiviite-(Y) (Y,Yb)2Si2O7 C 2/m 2/m

VIII/C.01-30 Keiviite-(Yb) (Yb,Y)2Si2O7 C 2/m 2/m

VIII/C.01-40 Yttrialite-(Y) (Y,Th)2Si2O7 P 2₁/m 2/m

VIII/C.01-45 Percleveite-(Ce)! (Ce,La,Nd)2Si2O7 P 4₁ 4

VIII/C.01-50 Rowlandite-(Y) Y4FeSi4O14F2(?) None

Other Kristiansenite Information

References:

NAME( AmMin, 88:251) PHYS. PROP.(AmMin, 88:251) OPTIC PROP.(AmMin, 88:251)

See Also:

Links to other databases for Kristiansenite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Kristiansenite

Ca2ScSn(Si2O7)(Si2O6OH)
Dana No: 56.2.4.16 Strunz No: VIII/C.01-18
Locality:

Notes: