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 30.59 % 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:

In some rare-earth-rich pegmatites. Associated with gadolinite.

IMA Status:

Valid Species (Pre-IMA) 1891

Locality:

Baringer Hill pegmatite, 26 km west of Burnet, Llano Co., and from Clear Creek, Burnet Co., Texas, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Henry Augustus Rowland (1848-1901), American physicist and spectroscopist, of Johns Hopkins University, Baltimore, Maryland, USA,

Name Pronunciation:

Rowlandite-(Y) + Pronunciation

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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

Diaphaneity:

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
Ncalc = 1.81

Optical Data:

Isotropic, n=1.725.

Calculated Properties of Rowlandite-(Y)

Electron Density:

Bulk Density (Electron Density)=4.21 gm/cc
note: Specific Gravity of Rowlandite-(Y) =4.50 gm/cc.

Fermion Index:

Fermion Index = 0.0083199759
Boson Index = 0.9916800241

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rowlandite-(Y) is Not Radioactive

Rowlandite-(Y) Classification

Dana Class:

55.02.01b.01 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions

(55.02)with cations in [6] coordination

(55.02.01b)Thortveitite related species

55.02.01b.01 Rowlandite-(Y) Y4FeSi4O14F2(?) None

55.02.01b.02 Thalenite-(Y) Y3Si3O10(OH) P 2₁/n 2/m

55.02.01b.03 Yttrialite-(Y) (Y,Th)2Si2O7 P 2₁/m 2/m

55.02.01b.04 Fluorthalenite-(Y)! Y3Si3O10F P 2₁/m 2/m

Strunz Class:

09.HG.20 09 - SILICATES (Germanates)

09.H - Unclassified Silicates

09.HG -With REE, Th

09.HG.20 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 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Print or Cut-and-Paste your Rowlandite-(Y) Specimen Label here :

Rowlandite-(Y)

Y4Fe++Si4O14F2 (?)
Dana No: 55.02.01b.01 Strunz No: 09.HG.20
Locality:

Notes: