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Rowlandite-(Y)

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Big Photo

Stetind, Tysfjord, Nordland, Norway
© luigi chiappino

Show Rowlandite-(Y) Photos (2)



Formula:
(Y,Ce)
 
4
Fe
2+
 
(Si
 
2
O
 
7
)
 
2
F
 
2
 (?)
System:TriclinicColour:Pale dull green, greyish ...
Hardness:5½ - 6½
Name:
Named after Henry Augustus Rowland (1848-1901), Professor of Physics.


Commonly metamict.

Classification of Rowlandite-(Y)

IMA status:Approved
Strunz 8th edition ID:8/C.01-50
Nickel-Strunz 10th (pending) edition ID:9.HG.20

9 : SILICATES (Germanates)
H : Unclassified silicates
G : With REE, Th
Dana 8th edition ID:55.2.1b.1

55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
2 : Si2O7 Groups, Generally with no Additional Anions with cations in [6] coordination
Hey's CIM Ref.:17.1.18

17 : Silicates Containing other Anions
1 : Silicates with fluoride (not containing Al)
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Type Occurrence of Rowlandite-(Y)

Type Locality:Baringer Hill (Barringer Hill), Bluffton, Llano Co., Texas, USA
Geological Setting of type material:Rare earth pegmatite
Associated Minerals at type locality:
GadoliniteGadolinite

Occurrences of Rowlandite-(Y)

Geological Setting:Rare earth bearing pegmatites

Physical Properties of Rowlandite-(Y)

Lustre:Vitreous, Waxy
Diaphaneity (Transparency):Transparent
Comment:Waxy when altered
Colour:Pale dull green, greyish white
Comment:alters to brick red
Hardness (Mohs):5½ - 6½
Density (calculated):4.33 g/cm3
Comment:4.30 - metamict, 4.55 when heated to 050 for hour, 4.85 when crystalline

Crystallography of Rowlandite-(Y)

Crystal System:Triclinic
Cell Parameters:a = 6.59Å, b = 8.65Å, c = 5.53Å
α = 99.03°, β = 104.12°, γ = 91.47°
Ratio:a:b:c = 0.762 : 1 : 0.639
Unit Cell Volume:V 301.24 ų (Calculated from Unit Cell)
Z:1
Morphology:Small irregular masses.
Comment:Commonly metamict.

Optical Data of Rowlandite-(Y)

Type:Biaxial (+)
RI values: nα = 1.763 nγ = 1.769
Maximum Birefringence:δ = 0.006

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Comments:Isotropic when metamict (n=1.704; 1.76 when heated)

Chemical Properties of Rowlandite-(Y)

Formula:
(Y,Ce)
 
4
Fe
2+
 
(Si
 
2
O
 
7
)
 
2
F
 
2
 (?)
Essential elements:F, Fe, O, Si, Y
All elements listed in formula:Ce, F, Fe, O, Si, Y

Relationship of Rowlandite-(Y) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.HG.15Umbozerite
Na
 
3
Sr
 
4
Th[Si(O,OH)
 
3-4
]
 
8
Related Minerals - Hey's Index Grouping:

- +
17.1.1Hectorite
Na
 
0.3
(Mg,Li)
 
3
(Si
 
4
O
 
10
)(F,OH)
 
2
17.1.3Agrellite
NaCa
 
2
Si
 
4
O
 
10
F
17.1.4Apophyllite-(NaF)
NaCa
 
4
(Si
 
8
O
 
20
)F · 8H
 
2
O
17.1.5Apophyllite-(KF)
KCa
 
4
(Si
 
8
O
 
20
)(F,OH) · 8H
 
2
O
17.1.6Apophyllite-(KOH)
KCa
 
4
(Si
 
8
O
 
20
)(OH,F) · 8H
 
2
O
17.1.7Hsianghualite
Ca
 
3
Li
 
2
(Be
 
3
Si
 
3
O
 
12
)F
 
2
17.1.8Leucophanite
NaCaBeSi
 
2
O
 
6
F
17.1.9Norbergite
Mg
 
3
(SiO
 
4
)(F,OH)
 
2
17.1.10Chondrodite
(Mg,Fe
2+
 
)
 
5
(SiO
 
4
)
 
2
(F,OH)
 
2
17.1.11Humite
(Mg,Fe
2+
 
)
 
7
(SiO
 
4
)
 
3
(F,OH)
 
2
17.1.12Clinohumite
(Mg,Fe
2+
 
)
 
9
(SiO
 
4
)
 
4
(F,OH)
 
2
17.1.13Canasite
K
 
2
Na
 
4
Ca
 
5
(Si
 
12
O
 
30
(OH,F)
 
4
17.1.14Charoite
(K,Na)
 
6-7
(Ca,Na)
 
18
[(Si
 
6
O
 
17
)(Si
 
12
O
 
30
)(Si
 
18
O
 
45
)](OH,F)
 
2
 · n H
 
2
O
17.1.15Cuspidine
Ca
 
4
(Si
 
2
O
 
7
)(F,OH)
 
2
17.1.16Bultfonteinite
Ca
 
2
(HSiO
 
4
)F · H
 
2
O
17.1.17Zeophyllite
Ca
 
4
Si
 
3
O
 
8
(OH,F)
 
4
 · 2H
 
2
O
17.1.19Yuksporite
(K,Ba)NaCa
 
2
(Si,Ti)
 
4
O
 
11
(F,OH) · H
 
2
O
17.1.20Yftisite-(Y)
(Y,Dy,Er)
 
4
(Ti,Sn)(SiO
 
4
)
 
2
O(F,OH)
 
6
17.1.21Mosandrite
Ti(◻,Ca,Na)
 
3
(Ca,REE)
 
4
(Si
 
2
O
 
7
)
 
2
[H
 
2
O,OH,F]
 
4
 · H
 
2
O
17.1.22Hiortdahlite
(Ca,Na)
 
3
(Zr,Ti)(Si
 
2
O
 
7
)(O,OH,F)
 
2
17.1.23Burpalite
Na
 
2
CaZr(Si
 
2
O
 
7
)F
 
2
17.1.24Seidozerite
Na
 
8
Mn
2+
2
Zr
 
3
Ti
 
3
(Si
 
2
O
 
7
)
 
4
O
 
4
F
 
4
17.1.25Thorosteenstrupine
CaMnThSi
 
4
O
 
11
(OH)F · 6H
 
2
O
17.1.26Zircophyllite
(K,Na)
 
3
(Mn,Fe
2+
 
)
 
7
(Zr,Ti)
 
2
Si
 
8
O
 
24
(O,OH,F)
 
7
17.1.27Jinshajiangite
BaNaFe
2+
4
Ti
 
2
(Si
 
2
O
 
7
)
 
2
O
 
2
(OH)
 
2
F
17.1.28Rosenbuschite
(Ca,Na)
 
3
(Zr,Ti)(Si
 
2
O
 
7
)OF
17.1.29Narsarsukite
Na
 
4
(Ti,Fe)
 
2
[Si
 
8
O
 
20
](O,OH,F)
 
2
17.1.30Sonolite
Mn
2+
9
(SiO
 
4
)
 
4
(OH,F)
 
2

Other Information

Other Information:Commonly metamict
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Rowlandite-(Y)

Reference List:

- +
Frondel, C. (1961): Two yttrium minerals: spencite and rowlandite. Can. Mineral., 6, 576-58l.

Shipovalov, Y.V. and Stepanov, A.V. (1971): X-ray structural study of rowlandite. Issled. Oblast. Khim. Fiz. Metod. Anal. Min. Syr'ya, 189-192 (in Russian).

Internet Links for Rowlandite-(Y)

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  • Rowlandite-(Y) details from Handbook of Mineralogy (PDF)
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    • Localities for Rowlandite-(Y)

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • Québec
      • Outaouais
        • Les Collines-de-l'Outaouais RCM
          • Val-des-Monts
            • Lac Saint-Pierre (Wakefield Lake)
    		www.minsocam.org/msa/Handbook/RowlanditeY.PDF.
    Kazakhstan
    Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
    Norway
     
    • Nordland
      • Tysfjord
        • Drag
          • Lapplægeret
    		Husdal, T. (2008): The minerals of the pegmatites within the Tysfjord granite, northern Norway. Norsk Bergverksmuseum Skrift 38: 5-28
    Husdal, T. (2008): The minerals of the pegmatites within the Tysfjord granite, northern Norway. Norsk Bergverksmuseum, skrift 38, 5-28.
    Sweden
     
    • Lappland
      • Jokkmokk
        • Varjisträsk
    		Berg & Mineral 9 (23), 27
    USA
     
    • Colorado
      • Jefferson Co.
        • South Platte Pegmatite District
    		Minerals of Colorado (1997) E.B. Eckels
    • Texas
      • Burnet Co.
    		Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
      • Llano Co.
        • Bluffton
    		CM 6 (1961), 576; Canadian Mineralogist (1961): 6: 576-581.; Am Min (1932) Volume 17, pages 381-390,
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