Rowlandite-(Y) Mineral Data

Rowlandite-(Y) Mineral Data +

General Rowlandite-(Y) Information

Chemical Formula:

Y4Fe++Si4O14F2 (?)

Composition:

Molecular Weight = 785.80 gm

Yttrium 45.26 % Y 57.47 % Y₂O₃

Iron 7.11 % Fe 9.14 % FeO

Silicon 14.30 % Si 30.58 % SiO₂

Oxygen 28.50 % O

Fluorine 4.84 % F 4.84 % F

- % F -2.04 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Y₄Fe²⁺Si₄O₁₄F₂

Environment:

Associated with gadolinite.

IMA Status:

Valid Species (Pre-IMA) 1891

Locality:

Llano Co., Texas. Link to MinDat.org Location Data.

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Rowlandite-(Y) Crystallography

Crystal System:

Amorphous- No Crystals

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

By Intensity(I/I_o): 3.06(1), 4.87(0.6), 3.51(0.55),

Physical Properties of Rowlandite-(Y)

Cleavage:

None

Color:

Gray white, Light green.

Density:

4.5

Diaphaniety:

Transparent to Subopaque

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

6-7 - Orthoclase-Quartz

Luminescence:

Non-fluorescent.

Streak:

white

Optical Properties of Rowlandite-(Y)

Gladstone-Dale:

CI meas= 0.109 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1611,KC= 0.1808

Optical Data:

Isotropic, n=1.725.

Calculated Properties of Rowlandite-(Y)

Electron Density:

r_electron=4.21 gm/cc
note: r_{Rowlandite-(Y)}=4.50 gm/cc.

Fermion Index

Fermion Index = 0.00831
Boson Index = 0.99169

Photoelectric:

PE_{Rowlandite-(Y)}= 59.50 barns/electron
U=PE_{Rowlandite-(Y)} x r_electron= 250.78 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rowlandite-(Y) is Not Radioactive

Rowlandite-(Y) Classification

Dana Class:

55.2.1b.1 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.2)with cations in [6] coordination

(55.2.1b)Thortveitite related species

55.2.1b.1 Rowlandite-(Y) Y4FeSi4O14F2(?) None

55.2.1b.2 Thalenite-(Y) Y3Si3O10(OH) P 2₁/n 2/m

55.2.1b.3 Yttrialite-(Y) (Y,Th)2Si2O7 P 2₁/m 2/m

55.2.1b.4 Fluorthalenite-(Y)! Y3Si3O10F P 2₁/m 2/m

Strunz Class:

VIII/C.01-50 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 Rowlandite-(Y) Information

References:

NAME( Ford32) PHYS. PROP.(Dana) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Rowlandite-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas

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Rowlandite-(Y)

Y4Fe++Si4O14F2 (?)
Dana No: 55.2.1b.1 Strunz No: VIII/C.01-50
Locality:

Notes: