Mineralogy Database

Rowlandite-(Y) Mineral Data

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General Rowlandite-(Y) Information

Help on Chemical  Formula: Chemical Formula: Y4Fe++Si4O14F2 (?)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Y4Fe2+Si4O14F2
Help on Environment: Environment: In some rare-earth-rich pegmatites. Associated with gadolinite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1891
Help on Locality: 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.
Help on Name Origin: Name Origin: Named for Henry Augustus Rowland (1848-1901), American physicist and spectroscopist, of Johns Hopkins University, Baltimore, Maryland, USA,
Help on Name Pronunciation: Name Pronunciation: Rowlandite-(Y) + Pronunciation Say ROWLANDITE-(Y)

Rowlandite-(Y) Crystallography

Help on Crystal System: Crystal System: Amorphous- No Crystals
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.06(1), 4.87(0.6), 3.51(0.55),

Physical Properties of Rowlandite-(Y)

Help on Cleavage: Cleavage: None
Help on Color: Color: Gray white, Light green.
Help on Density: Density: 4.5
Help on Diaphaneity: Diaphaneity: Transparent to Subopaque
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 6-7 - Orthoclase-Quartz
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Streak: Streak: white

Optical Properties of Rowlandite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.109 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1611,KC= 0.1808
Ncalc = 1.81
Help on Optical Data: Optical Data: Isotropic, n=1.725.

Calculated Properties of Rowlandite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.21 gm/cc
note: Specific Gravity of Rowlandite-(Y) =4.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0083199759
Boson Index = 0.9916800241
Help on Photoelectric: Photoelectric: PERowlandite-(Y) = 59.50 barns/electron
U=PERowlandite-(Y) x rElectron Density= 250.78 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rowlandite-(Y) is Not Radioactive

Rowlandite-(Y) Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( Ford32) PHYS. PROP.(Dana) OPTIC PROP.(Ford32)
Help on See Also: 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 :


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





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