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Rowlandite-(Y) Mineral Data
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General Rowlandite-(Y) Information
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 Chemical Formula: |
Y4Fe++Si4O14F2 (?) |
| Composition: |
Molecular Weight = 785.80 gm |
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Yttrium 45.26 % Y 57.47 % Y2O3 |
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Iron 7.11 % Fe 9.14 % FeO |
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Silicon 14.30 % Si 30.59 % SiO2 |
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Oxygen 28.50 % O |
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Fluorine 4.84 % F 4.84 % F |
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- %
F -2.04 % -O=F2 |
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______ ______ |
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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
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| Crystal System: |
Amorphous- No Crystals |
| X Ray Diffraction: |
By Intensity(I/Io): 3.06(1), 4.87(0.6), 3.51(0.55), |
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Physical Properties of Rowlandite-(Y)
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| 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 |
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Optical Properties of Rowlandite-(Y)
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| 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. |
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Calculated Properties of Rowlandite-(Y)
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| Electron Density: |
Bulk Density (Electron Density)=4.21 gm/cc
note: Specific Gravity of Rowlandite-(Y) =4.50 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0083199759
Boson Index = 0.9916800241 |
| Photoelectric: |
PERowlandite-(Y) = 59.50 barns/electron
U=PERowlandite-(Y) x rElectron Density= 250.78 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rowlandite-(Y) is Not Radioactive |
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Rowlandite-(Y) Classification
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| Dana Class: |
55.02.01b.01 (55)Sorosilicate Si2O7 Groups, Generally with No Additional Anions |
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(55.02)with cations in [6] coordination |
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(55.02.01b)Thortveitite related species |
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55.02.01b.01 Rowlandite-(Y) Y4FeSi4O14F2(?) None |
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55.02.01b.02 Thalenite-(Y) Y3Si3O10(OH) P 21/n 2/m |
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55.02.01b.03 Yttrialite-(Y) (Y,Th)2Si2O7 P 21/m 2/m |
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55.02.01b.04 Fluorthalenite-(Y)! Y3Si3O10F P 21/m 2/m |
| Strunz Class: |
09.HG.20 09 - SILICATES (Germanates) |
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09.H - Unclassified Silicates |
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09.HG -With REE, Th |
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09.HG.20 Rowlandite-(Y) Y4FeSi4O14F2(?) None |
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Other Rowlandite-(Y) Information
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| 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 :
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Rowlandite-(Y)
Y4Fe++Si4O14F2 (?)
Dana No: 55.02.01b.01 Strunz No: 09.HG.20
Locality:
Notes:
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